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<time title="创建于" itemprop="dateCreated datePublished" datetime="2019-03-01T16:53:21+08:00">2019-03-01 </time></span><span class="post-category"><span class="post-meta-divider">|</span> <span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/basic-technical-knowledge/" itemprop="url" rel="index"><span itemprop="name">基础技术知识</span> </a></span></span><span id="busuanzi_container_page_pv" style="display:none"><span class="post-meta-divider">|</span> 阅读次数 <span id="busuanzi_value_page_pv"></span></span><div class="post-wordcount"><span class="post-meta-item-text">字数统计</span> <span title="字数统计">5,315字 </span><span class="post-meta-divider">|</span> <span class="post-meta-item-text">阅读时长 ≈</span> <span title="阅读时长">28分钟</span></div></div></header><div class="post-body" itemprop="articleBody"><p>由于技术能力的限制，平时会遇到一些自己觉得非常诡异的问题，感觉到莫名其妙。其实到头来发现，归根结底还是自己的认知问题：可能是技术水平不够，或者考虑不周全，甚至是一些低级别的错误判断。总而言之，遇到这些问题后，有时候请教人、查资料之后仍旧不得解，只能先记录下来，留做备注说明，等待以后解决。当然，随着时间的流逝，有些问题可能就被忘记了，有些问题在之后的某一个时间点被解决了。本文就是要记录这些问题，并在遇到新问题或者解决老问题之后，保持更新。</p><a id="more"></a><h1 id="常用链接"><a href="# 常用链接" class="headerlink" title="常用链接"></a>常用链接</h1><p>在这里先列出一些常用的网站链接，方便查看：</p><ul><li>es-hadoop 官网：<a href="https://www.elastic.co/guide/en/elasticsearch/hadoop/5.6/configuration.html" target="_blank" rel="noopener">https://www.elastic.co/guide/en/elasticsearch/hadoop/5.6/configuration.html</a> ；</li><li>x</li></ul><h1 id="es-spark- 读取 -es- 数据后 -count- 报错"><a href="#es-spark- 读取 -es- 数据后 -count- 报错" class="headerlink" title="es-spark 读取 es 数据后 count 报错"></a>es-spark 读取 es 数据后 count 报错</h1><p>使用 es-hadoop 组件，起 Spark 任务去查询 es 数据，然后过滤，过滤后做一个 count 算子，结果就报错了。而且，在报错后又重试了很多次（5 次以上），一直正常，没法重现问题。这个任务需要经常跑，以前从来没遇到过这样的异常，初步怀疑是 es 集群不稳定，具体原因不得而知。</p><p>错误截图：<br><img src="https://raw.githubusercontent.com/iplaypi/img-playpi/master/img/old/b7f2e3a3gy1g0pyfelevwj20vj0mr0w0.jpg" alt="报错信息截图" title="报错信息截图"></p><p>完整错误信息如下（重要包名称被替换）：<br></p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">2019</span>-<span class="number">02</span>-<span class="number">26_15</span>:<span class="number">01</span>:<span class="number">44</span> [main] ERROR spokesman3.SpokesAndBrand:<span class="number">510</span>: !!!!Spark 出错: org.codehaus.jackson.JsonParseException: Unexpected end-of-input in field name</span><br><span class="line"> at [Source: org.apache.commons.httpclient.AutoCloseInputStream@<span class="number">2687</span>cf14; line: <span class="number">1</span>, column: <span class="number">17581</span>]</span><br><span class="line">org.elasticsearch.hadoop.rest.EsHadoopParsingException: org.codehaus.jackson.JsonParseException: Unexpected end-of-input in field name</span><br><span class="line"> at [Source: org.apache.commons.httpclient.AutoCloseInputStream@<span class="number">2687</span>cf14; line: <span class="number">1</span>, column: <span class="number">17581</span>]</span><br><span class="line"> at org.elasticsearch.hadoop.rest.RestClient.parseContent (RestClient.java:<span class="number">171</span>)</span><br><span class="line"> at org.elasticsearch.hadoop.rest.RestClient.get (RestClient.java:<span class="number">155</span>)</span><br><span class="line"> at org.elasticsearch.hadoop.rest.RestClient.targetShards (RestClient.java:<span class="number">357</span>)</span><br><span class="line"> at org.elasticsearch.hadoop.rest.RestRepository.doGetReadTargetShards (RestRepository.java:<span class="number">306</span>)</span><br><span class="line"> at org.elasticsearch.hadoop.rest.RestRepository.getReadTargetShards (RestRepository.java:<span class="number">297</span>)</span><br><span class="line"> at org.elasticsearch.hadoop.rest.RestService.findPartitions (RestService.java:<span class="number">241</span>)</span><br><span class="line"> at org.elasticsearch.spark.rdd.AbstractEsRDD.esPartitions$lzycompute (AbstractEsRDD.scala:<span class="number">73</span>)</span><br><span class="line"> at org.elasticsearch.spark.rdd.AbstractEsRDD.esPartitions (AbstractEsRDD.scala:<span class="number">72</span>)</span><br><span class="line"> at org.elasticsearch.spark.rdd.AbstractEsRDD.getPartitions (AbstractEsRDD.scala:<span class="number">44</span>)</span><br><span class="line"> at org.apache.spark.rdd.RDD$$anonfun$partitions$<span class="number">2</span>.apply (RDD.scala:<span class="number">239</span>)</span><br><span class="line"> at org.apache.spark.rdd.RDD$$anonfun$partitions$<span class="number">2</span>.apply (RDD.scala:<span class="number">237</span>)</span><br><span class="line"> at scala.Option.getOrElse (Option.scala:<span class="number">120</span>)</span><br><span class="line"> at org.apache.spark.rdd.RDD.partitions (RDD.scala:<span class="number">237</span>)</span><br><span class="line"> at org.apache.spark.SparkContext.runJob (SparkContext.scala:<span class="number">1929</span>)</span><br><span class="line"> at org.apache.spark.rdd.RDD.count (RDD.scala:<span class="number">1157</span>)</span><br><span class="line"> at org.apache.spark.api.java.JavaRDDLike$class.count (JavaRDDLike.scala:440)</span><br><span class="line"> at org.apache.spark.api.java.AbstractJavaRDDLike.count (JavaRDDLike.scala:<span class="number">46</span>)</span><br><span class="line"> at com.package.to.class.SpokesAndBrand.getMention (SpokesAndBrand.java:508)</span><br><span class="line"> at com.package.to.class.SpokesAndBrand.runCelebrityByBrand (SpokesAndBrand.java:185)</span><br><span class="line"> at com.package.to.class.SpokesAndBrand.execute (SpokesAndBrand.java:116)</span><br><span class="line"> at com.package.to.class.SpokesmanAnalyzer.execute (SpokesmanAnalyzer.java:162)</span><br><span class="line"> at com.package.to.class.SpokesmanAnalyzeCli.execute (SpokesmanAnalyzeCli.java:154)</span><br><span class="line"> at com.package.to.class.SpokesmanAnalyzeCli.start (SpokesmanAnalyzeCli.java:75)</span><br><span class="line"> at com.package.to.class.util.AdvCli.initRunner (AdvCli.java:191)</span><br><span class="line"> at com.package.to.class.job.client.BasicInputOutputSystemWorker.run (BasicInputOutputSystemWorker.java:79)</span><br><span class="line"> at com.package.to.class.model.AbstractDataReportWorker.run (AbstractDataReportWorker.java:122)</span><br><span class="line"> at com.package.to.class.buffalo.job.AbstractBUTaskWorker.runTask (AbstractBUTaskWorker.java:63)</span><br><span class="line"> at com.package.to.class.report.cli.TaskLocalRunnerCli.start (TaskLocalRunnerCli.java:110)</span><br><span class="line"> at com.package.to.class.util.AdvCli.initRunner (AdvCli.java:191)</span><br><span class="line"> at com.package.to.class.report.cli.TaskLocalRunnerCli.main (TaskLocalRunnerCli.java:43)</span><br><span class="line">Caused by: org.codehaus.jackson.JsonParseException: Unexpected end-of-input in field name</span><br><span class="line"> at [Source: org.apache.commons.httpclient.AutoCloseInputStream@<span class="number">2687</span>cf14; line: <span class="number">1</span>, column: <span class="number">17581</span>]</span><br><span class="line"> at org.codehaus.jackson.JsonParser._constructError (JsonParser.java:<span class="number">1433</span>)</span><br><span class="line"> at org.codehaus.jackson.impl.JsonParserMinimalBase._reportError (JsonParserMinimalBase.java:<span class="number">521</span>)</span><br><span class="line"> at org.codehaus.jackson.impl.JsonParserMinimalBase._reportInvalidEOF (JsonParserMinimalBase.java:<span class="number">454</span>)</span><br><span class="line"> at org.codehaus.jackson.impl.Utf8StreamParser.parseEscapedFieldName (Utf8StreamParser.java:<span class="number">1503</span>)</span><br><span class="line"> at org.codehaus.jackson.impl.Utf8StreamParser.slowParseFieldName (Utf8StreamParser.java:<span class="number">1404</span>)</span><br><span class="line"> at org.codehaus.jackson.impl.Utf8StreamParser._parseFieldName (Utf8StreamParser.java:<span class="number">1231</span>)</span><br><span class="line"> at org.codehaus.jackson.impl.Utf8StreamParser.nextToken (Utf8StreamParser.java:<span class="number">495</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.UntypedObjectDeserializer.mapObject (UntypedObjectDeserializer.java:<span class="number">219</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.UntypedObjectDeserializer.deserialize (UntypedObjectDeserializer.java:<span class="number">47</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.UntypedObjectDeserializer.mapArray (UntypedObjectDeserializer.java:<span class="number">165</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.UntypedObjectDeserializer.deserialize (UntypedObjectDeserializer.java:<span class="number">51</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.UntypedObjectDeserializer.mapArray (UntypedObjectDeserializer.java:<span class="number">165</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.UntypedObjectDeserializer.deserialize (UntypedObjectDeserializer.java:<span class="number">51</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.MapDeserializer._readAndBind (MapDeserializer.java:<span class="number">319</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.MapDeserializer.deserialize (MapDeserializer.java:<span class="number">249</span>)</span><br><span class="line"> at org.codehaus.jackson.map.deser.std.MapDeserializer.deserialize (MapDeserializer.java:<span class="number">33</span>)</span><br><span class="line"> at org.codehaus.jackson.map.ObjectMapper._readValue (ObjectMapper.java:<span class="number">2704</span>)</span><br><span class="line"> at org.codehaus.jackson.map.ObjectMapper.readValue (ObjectMapper.java:<span class="number">1286</span>)</span><br><span class="line"> at org.elasticsearch.hadoop.rest.RestClient.parseContent (RestClient.java:<span class="number">166</span>)</span><br><span class="line"> ... <span class="number">29</span> more</span><br><span class="line"><span class="number">2019</span>-<span class="number">02</span>-<span class="number">26_15</span>:<span class="number">01</span>:<span class="number">44</span> [main] INFO rdd.JavaEsRDD:<span class="number">58</span>: Removing RDD <span class="number">3086</span> from persistence list</span><br></pre></td></tr></table></figure><p></p><h1 id="Hexo- 生成 -html- 静态页面目录锚点失效"><a href="#Hexo- 生成 -html- 静态页面目录锚点失效" class="headerlink" title="Hexo 生成 html 静态页面目录锚点失效"></a>Hexo 生成 html 静态页面目录锚点失效</h1><p>我这些所有的博客文档是先写成 Markdown 文件，然后使用 Hexo 渲染生成 html 静态页面，再发布到 GitHub Pages 上面，还有一些是发布到我自己的 VPS 上面（为了百度爬虫）。</p><p>但是最近我发现一个现象，有一些文章的锚点无效，也就是表现为目录无法跳转，例如想直接查看某一级目录的内容，在右侧的 <strong>文章目录 </strong>中直接点击对应的标题，不会自动跳转过去。这个问题我发现了很久，但是一直没在意，也没有找到原因。最近才碰巧发现是因为标题内容里面有空格，这才导致生成的 html 静态页面里面的锚点失效，我随机又测试了几次其它的页面，看起来的确是这样。下面列出一些示例：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">https://www.playpi.org/2019022501.html ，Hexo 踩坑记录的 </span><br><span class="line">https://www.playpi.org/2018121901.html ，js 字符串分割方法 </span><br><span class="line">https://www.playpi.org/2019020701.html ，itchat 0 - 初识 </span><br></pre></td></tr></table></figure><p>但是，我又发现其他人的博客，目录标题内容中也有空格，却可以正常跳转，我很疑惑。现在我猜测是 Hexo 的问题，或者哪里需要配置，等待以后的解决方法吧。别人的博客示例：<a href="https://blog.itnote.me/Hexo/hexo-chinese-english-space/" target="_blank" rel="noopener">https://blog.itnote.me/Hexo/hexo-chinese-english-space/</a> 。</p><h1 id="邮件依赖的诡异异常"><a href="# 邮件依赖的诡异异常" class="headerlink" title="邮件依赖的诡异异常"></a>邮件依赖的诡异异常</h1><p>在项目中新引入了邮件相关的依赖【没有其它任何变化】，这样就可以在需要时发送通知邮件，依赖内容如下：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><!-- 邮件相关依赖 --></span><br><span class="line"><dependency></span><br><span class="line"> <groupId>org.apache.commons</groupId></span><br><span class="line"> <artifactId>commons-email</artifactId></span><br><span class="line"> <version>1.3.3</version></span><br><span class="line"></dependency></span><br></pre></td></tr></table></figure><p>然后神奇的事情发生了，实际执行时，程序抛出异常【去掉这个依赖则正常】：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">Exception in thread "main" java.lang.StackOverflowError</span><br><span class="line"> at sun.nio.cs.UTF_8$Encoder.encodeLoop (UTF_8.java:619)</span><br><span class="line"> at java.nio.charset.CharsetEncoder.encode (CharsetEncoder.java:561)</span><br><span class="line"> at sun.nio.cs.StreamEncoder.implWrite (StreamEncoder.java:271)</span><br><span class="line"> at sun.nio.cs.StreamEncoder.write (StreamEncoder.java:125)</span><br><span class="line"> at java.io.OutputStreamWriter.write (OutputStreamWriter.java:207)</span><br><span class="line"> at java.io.BufferedWriter.flushBuffer (BufferedWriter.java:129)</span><br><span class="line"> at java.io.PrintStream.write (PrintStream.java:526)</span><br><span class="line"> at java.io.PrintStream.print (PrintStream.java:669)</span><br><span class="line"> at java.io.PrintStream.println (PrintStream.java:806)</span><br><span class="line"> at org.slf4j.impl.SimpleLogger.write (SimpleLogger.java:381)</span><br><span class="line"> at org.slf4j.impl.SimpleLogger.log (SimpleLogger.java:376)</span><br><span class="line"> at org.slf4j.impl.SimpleLogger.info (SimpleLogger.java:538)</span><br><span class="line"> at org.apache.maven.cli.logging.Slf4jLogger.info (Slf4jLogger.java:59)</span><br><span class="line"> at org.codehaus.plexus.archiver.AbstractArchiver$1.hasNext (AbstractArchiver.java:464)</span><br><span class="line"> at org.codehaus.plexus.archiver.AbstractArchiver$1.hasNext (AbstractArchiver.java:467)</span><br><span class="line"> at org.codehaus.plexus.archiver.AbstractArchiver$1.hasNext (AbstractArchiver.java:467)</span><br><span class="line"> at org.codehaus.plexus.archiver.AbstractArchiver$1.hasNext (AbstractArchiver.java:467)</span><br></pre></td></tr></table></figure><p>而根据这个异常信息，我搜索不到任何有效的信息，一直无法解决。最后，我对比了其它项目的配置，发现 手动设置 maven-assembly-plugin 插件的版本为<version>2.6</version>即可。而之前是没有设置这个版本号的，默认去仓库获取的最新版本，这个默认的版本可能刚好有问题。</p><h1 id="Python- 入门踩坑"><a href="#Python- 入门踩坑" class="headerlink" title="Python 入门踩坑"></a>Python 入门踩坑</h1><p>在一开始使用 Python 的时候，没有使用类似 Anaconda、Winpython 这种套件来帮我自动管理 Python 的第三方工具库，而是从 Python 安装开始，用到什么再用 pip 安装什么。整个过程真的可以把人搞崩溃，工具库之间的传递依赖、版本的不兼容等问题，令人望而却步，下面给出一些难忘的经历。</p><p>出现错误：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Install packages failed: Installing packages: error occurred</span><br><span class="line">numpy.distutils.system_info.NotFoundError: no lapack/blas resources found</span><br></pre></td></tr></table></figure><p>需要先手动安装 numpy+mkl，再手动安装 scipy，下载文件链接：<a href="http://www.lfd.uci.edu/~gohlke/pythonlibs" target="_blank" rel="noopener">http://www.lfd.uci.edu/~gohlke/pythonlibs</a> 。我下载了 2 个文件：numpy-1.11.3+mkl-cp27-cp27m-win32.whl、scipy-0.19.0-cp27-cp27m-win32.whl，然后手动安装。</p><p>一开始我下载的是 64 位的安装包，结果发现我的 Windows 安装的 Python 是 32 位的，导致不支持【下载时没有选择位数，直接下载的默认的包】。另外，直接进入 Python 的命令行环境时也会打印出版本信息的。使用 import pip; print (pip.pep425tags.get_supported ()); 可以获取到 pip 支持的文件名和版本。</p><p>注意安装 scipy 之前还需要各种第三方库，官方介绍：<strong>Install numpy+mkl before installing scipy.</strong>。在 Shell 中验证安装第三方库是否成功，例如 numpy：from numpy import *。</p><p>scipy 包安装：pip install scipy==0.16.1【不推荐】，成功完成安装，如果缺少第三方包会报很多错误。网上查询后的总结：安装 numpy 后安装 scipy 失败，报错：<strong>numpy.distutils.system_info.NotFoundError</strong>，一般是缺少一些系统库，需要安装：libopenblas-dev、liblapack-dev、libatlas-dev、libblas-dev。</p><p>常见第三方库介绍：</p><ul><li>pandas，分析数据</li><li>sklearn，机器学习，各种算法</li><li>jieba，分词工具</li><li>gensim nlp word2v，模块训练词向量模型</li><li>scipy，算法库，数学工具包</li><li>numpy，数据分析</li><li>matlptop，图形可视化</li></ul><p>Python 中的编码：<br>2.X 版本，python 编码过程： 输入 –> str –> decode –> unicode –> encode –> str –> 输出。<br>3.X 版本，不一样，直接是 unicode。</p><p>Python 中代码有 <strong>print u’xx’ + yy</strong>，yy 是中文，直接跑的时候打印到 Shell 不报错，但是使用后台挂起跑的时候，重定向到文件时，会报错，因为 Python 获取不到输出流的编码。</p><h1 id="Spark-UI- 无法显示"><a href="#Spark-UI- 无法显示" class="headerlink" title="Spark UI 无法显示"></a>Spark UI 无法显示</h1><p>使用 yarn-client 模式起了一个 Spark 任务，在 Driver 端看到异常日志：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br></pre></td><td class="code"><pre><span class="line">2019-01-16_14:53:31 [qtp192486017-1829 - /static/timeline-view.js] WARN servlet.DefaultServlet:587: EXCEPTION </span><br><span class="line">java.lang.IllegalArgumentException: MALFORMED</span><br><span class="line"> at java.util.zip.ZipCoder.toString (ZipCoder.java:58)</span><br><span class="line"> at java.util.zip.ZipFile.getZipEntry (ZipFile.java:583)</span><br><span class="line"> at java.util.zip.ZipFile.access$900 (ZipFile.java:60)</span><br><span class="line"> at java.util.zip.ZipFile$ZipEntryIterator.next (ZipFile.java:539)</span><br><span class="line"> at java.util.zip.ZipFile$ZipEntryIterator.nextElement (ZipFile.java:514)</span><br><span class="line"> at java.util.zip.ZipFile$ZipEntryIterator.nextElement (ZipFile.java:495)</span><br><span class="line"> at java.util.jar.JarFile$JarEntryIterator.next (JarFile.java:257)</span><br><span class="line"> at java.util.jar.JarFile$JarEntryIterator.nextElement (JarFile.java:266)</span><br><span class="line"> at java.util.jar.JarFile$JarEntryIterator.nextElement (JarFile.java:247)</span><br><span class="line"> at org.spark-project.jetty.util.resource.JarFileResource.exists (JarFileResource.java:189)</span><br><span class="line"> at org.spark-project.jetty.servlet.DefaultServlet.getResource (DefaultServlet.java:398)</span><br><span class="line"> at org.spark-project.jetty.servlet.DefaultServlet.doGet (DefaultServlet.java:476)</span><br><span class="line"> at javax.servlet.http.HttpServlet.service (HttpServlet.java:707)</span><br><span class="line"> at javax.servlet.http.HttpServlet.service (HttpServlet.java:820)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHolder.handle (ServletHolder.java:684)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1507)</span><br><span class="line"> at org.apache.hadoop.yarn.server.webproxy.amfilter.AmIpFilter.doFilter (AmIpFilter.java:164)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1478)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:499)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1086)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler.doScope (ServletHandler.java:427)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1020)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:135)</span><br><span class="line"> at org.spark-project.jetty.server.handler.GzipHandler.handle (GzipHandler.java:264)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:255)</span><br><span class="line"> at org.spark-project.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:116)</span><br><span class="line"> at org.spark-project.jetty.server.Server.handle (Server.java:366)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection.handleRequest (AbstractHttpConnection.java:494)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection.headerComplete (AbstractHttpConnection.java:973)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete (AbstractHttpConnection.java:1035)</span><br><span class="line"> at org.spark-project.jetty.http.HttpParser.parseNext (HttpParser.java:641)</span><br><span class="line"> at org.spark-project.jetty.http.HttpParser.parseAvailable (HttpParser.java:231)</span><br><span class="line"> at org.spark-project.jetty.server.AsyncHttpConnection.handle (AsyncHttpConnection.java:82)</span><br><span class="line"> at org.spark-project.jetty.io.nio.SelectChannelEndPoint.handle (SelectChannelEndPoint.java:696)</span><br><span class="line"> at org.spark-project.jetty.io.nio.SelectChannelEndPoint$1.run (SelectChannelEndPoint.java:53)</span><br><span class="line"> at org.spark-project.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:608)</span><br><span class="line"> at org.spark-project.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:543)</span><br><span class="line"> at java.lang.Thread.run (Thread.java:748)</span><br><span class="line">2019-01-16_14:53:31 [qtp192486017-1829 - /static/timeline-view.js] WARN servlet.ServletHandler:592: Error for /static/timeline-view.js</span><br><span class="line">java.lang.NoClassDefFoundError: org/spark-project/jetty/server/handler/ErrorHandler$ErrorPageMapper</span><br><span class="line"> at org.spark-project.jetty.server.handler.ErrorHandler.handle (ErrorHandler.java:71)</span><br><span class="line"> at org.spark-project.jetty.server.Response.sendError (Response.java:349)</span><br><span class="line"> at javax.servlet.http.HttpServletResponseWrapper.sendError (HttpServletResponseWrapper.java:118)</span><br><span class="line"> at org.spark-project.jetty.http.gzip.CompressedResponseWrapper.sendError (CompressedResponseWrapper.java:291)</span><br><span class="line"> at org.spark-project.jetty.servlet.DefaultServlet.doGet (DefaultServlet.java:589)</span><br><span class="line"> at javax.servlet.http.HttpServlet.service (HttpServlet.java:707)</span><br><span class="line"> at javax.servlet.http.HttpServlet.service (HttpServlet.java:820)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHolder.handle (ServletHolder.java:684)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1507)</span><br><span class="line"> at org.apache.hadoop.yarn.server.webproxy.amfilter.AmIpFilter.doFilter (AmIpFilter.java:164)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1478)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:499)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1086)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler.doScope (ServletHandler.java:427)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1020)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:135)</span><br><span class="line"> at org.spark-project.jetty.server.handler.GzipHandler.handle (GzipHandler.java:264)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:255)</span><br><span class="line"> at org.spark-project.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:116)</span><br><span class="line"> at org.spark-project.jetty.server.Server.handle (Server.java:366)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection.handleRequest (AbstractHttpConnection.java:494)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection.headerComplete (AbstractHttpConnection.java:973)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete (AbstractHttpConnection.java:1035)</span><br><span class="line"> at org.spark-project.jetty.http.HttpParser.parseNext (HttpParser.java:641)</span><br><span class="line"> at org.spark-project.jetty.http.HttpParser.parseAvailable (HttpParser.java:231)</span><br><span class="line"> at org.spark-project.jetty.server.AsyncHttpConnection.handle (AsyncHttpConnection.java:82)</span><br><span class="line"> at org.spark-project.jetty.io.nio.SelectChannelEndPoint.handle (SelectChannelEndPoint.java:696)</span><br><span class="line"> at org.spark-project.jetty.io.nio.SelectChannelEndPoint$1.run (SelectChannelEndPoint.java:53)</span><br><span class="line"> at org.spark-project.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:608)</span><br><span class="line"> at org.spark-project.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:543)</span><br><span class="line"> at java.lang.Thread.run (Thread.java:748)</span><br><span class="line">2019-01-16_14:53:31 [qtp192486017-1829 - /static/timeline-view.js] WARN server.AbstractHttpConnection:552: /static/timeline-view.js</span><br><span class="line">java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.isAsyncStarted () Z</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:608)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1086)</span><br><span class="line"> at org.spark-project.jetty.servlet.ServletHandler.doScope (ServletHandler.java:427)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1020)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:135)</span><br><span class="line"> at org.spark-project.jetty.server.handler.GzipHandler.handle (GzipHandler.java:264)</span><br><span class="line"> at org.spark-project.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:255)</span><br><span class="line"> at org.spark-project.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:116)</span><br><span class="line"> at org.spark-project.jetty.server.Server.handle (Server.java:366)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection.handleRequest (AbstractHttpConnection.java:494)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection.headerComplete (AbstractHttpConnection.java:973)</span><br><span class="line"> at org.spark-project.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete (AbstractHttpConnection.java:1035)</span><br><span class="line"> at org.spark-project.jetty.http.HttpParser.parseNext (HttpParser.java:641)</span><br><span class="line"> at org.spark-project.jetty.http.HttpParser.parseAvailable (HttpParser.java:231)</span><br><span class="line"> at org.spark-project.jetty.server.AsyncHttpConnection.handle (AsyncHttpConnection.java:82)</span><br><span class="line"> at org.spark-project.jetty.io.nio.SelectChannelEndPoint.handle (SelectChannelEndPoint.java:696)</span><br><span class="line"> at org.spark-project.jetty.io.nio.SelectChannelEndPoint$1.run (SelectChannelEndPoint.java:53)</span><br><span class="line"> at org.spark-project.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:608)</span><br><span class="line"> at org.spark-project.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:543)</span><br><span class="line"> at java.lang.Thread.run (Thread.java:748)</span><br></pre></td></tr></table></figure><p>这个日志在反复打印，也就是在任务的运行过程中，一直都有这个错误。它引发了什么问题呢，我检查了一下，对 Spark 任务的实际功能并没有影响，任务跑完后功能正常实现。但是，我发现在任务的运行过程中，Spark UI 页面打开后不正常显示【异常信息的开头就是关于某个 js 文件问题】：<br><img src="https://raw.githubusercontent.com/iplaypi/img-playpi/master/img/old/b7f2e3a3gy1g12h3dbte0j20tr0ge3yv.jpg" alt="SparkUI 不正常显示" title="SparkUI 不正常显示"></p><p>点击进去，直接显示 Error 500：<br><img src="https://raw.githubusercontent.com/iplaypi/img-playpi/master/img/old/b7f2e3a3gy1g12h42u9iuj20t50fa74n.jpg" alt="点击进去" title="点击进去"><br><img src="https://raw.githubusercontent.com/iplaypi/img-playpi/master/img/old/b7f2e3a3gy1g12h48uvu5j20mj08imwz.jpg" alt="Error500" title="Error500"></p><p>服务器的 Driver 端日志截图：<br>日志截图 1<br><img src="https://raw.githubusercontent.com/iplaypi/img-playpi/master/img/old/b7f2e3a3gy1g12h4vfjokj20wu0mgwgs.jpg" alt="日志截图 1" title="日志截图 1"></p><p>日志截图 2<br><img src="https://raw.githubusercontent.com/iplaypi/img-playpi/master/img/old/b7f2e3a3gy1g12h4zran1j20ya0mgwgy.jpg" alt="日志截图 2" title="日志截图 2"></p><p>日志截图 3<br><img src="https://raw.githubusercontent.com/iplaypi/img-playpi/master/img/old/b7f2e3a3gy1g12h53va2qj20xs0mgacl.jpg" alt="日志截图 3" title="日志截图 3"></p><p>等了几天，又遇到同样的问题，除了这 2 次，其它时间点就没遇到过了：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br></pre></td><td class="code"><pre><span class="line">2019-01-24_22:51:49 [qtp697001207-1591 - /static/spark-dag-viz.js] WARN servlet.DefaultServlet:587: EXCEPTION </span><br><span class="line">java.lang.IllegalArgumentException: MALFORMED</span><br><span class="line">at java.util.zip.ZipCoder.toString (ZipCoder.java:58)</span><br><span class="line">at java.util.zip.ZipFile.getZipEntry (ZipFile.java:583)</span><br><span class="line">at java.util.zip.ZipFile.access$900 (ZipFile.java:60)</span><br><span class="line">at java.util.zip.ZipFile$ZipEntryIterator.next (ZipFile.java:539)</span><br><span class="line">at java.util.zip.ZipFile$ZipEntryIterator.nextElement (ZipFile.java:514)</span><br><span class="line">at java.util.zip.ZipFile$ZipEntryIterator.nextElement (ZipFile.java:495)</span><br><span class="line">at java.util.jar.JarFile$JarEntryIterator.next (JarFile.java:257)</span><br><span class="line">at java.util.jar.JarFile$JarEntryIterator.nextElement (JarFile.java:266)</span><br><span class="line">at java.util.jar.JarFile$JarEntryIterator.nextElement (JarFile.java:247)</span><br><span class="line">at org.spark-project.jetty.util.resource.JarFileResource.exists (JarFileResource.java:189)</span><br><span class="line">at org.spark-project.jetty.servlet.DefaultServlet.getResource (DefaultServlet.java:398)</span><br><span class="line">at org.spark-project.jetty.servlet.DefaultServlet.doGet (DefaultServlet.java:476)</span><br><span class="line">at javax.servlet.http.HttpServlet.service (HttpServlet.java:707)</span><br><span class="line">at javax.servlet.http.HttpServlet.service (HttpServlet.java:820)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHolder.handle (ServletHolder.java:684)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1507)</span><br><span class="line">at org.apache.hadoop.yarn.server.webproxy.amfilter.AmIpFilter.doFilter (AmIpFilter.java:164)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1478)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:499)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1086)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler.doScope (ServletHandler.java:427)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1020)</span><br><span class="line">at org.spark-project.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:135)</span><br><span class="line">at org.spark-project.jetty.server.handler.GzipHandler.handle (GzipHandler.java:264)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:255)</span><br><span class="line">at org.spark-project.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:116)</span><br><span class="line">at org.spark-project.jetty.server.Server.handle (Server.java:366)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection.handleRequest (AbstractHttpConnection.java:494)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection.headerComplete (AbstractHttpConnection.java:973)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete (AbstractHttpConnection.java:1035)</span><br><span class="line">at org.spark-project.jetty.http.HttpParser.parseNext (HttpParser.java:641)</span><br><span class="line">at org.spark-project.jetty.http.HttpParser.parseAvailable (HttpParser.java:231)</span><br><span class="line">at org.spark-project.jetty.server.AsyncHttpConnection.handle (AsyncHttpConnection.java:82)</span><br><span class="line">at org.spark-project.jetty.io.nio.SelectChannelEndPoint.handle (SelectChannelEndPoint.java:696)</span><br><span class="line">at org.spark-project.jetty.io.nio.SelectChannelEndPoint$1.run (SelectChannelEndPoint.java:53)</span><br><span class="line">at org.spark-project.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:608)</span><br><span class="line">at org.spark-project.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:543)</span><br><span class="line">at java.lang.Thread.run (Thread.java:748)</span><br><span class="line">2019-01-24_22:51:49 [qtp697001207-1591 - /static/spark-dag-viz.js] WARN servlet.ServletHandler:592: Error for /static/spark-dag-viz.js</span><br><span class="line">java.lang.NoClassDefFoundError: org/spark-project/jetty/server/handler/ErrorHandler$ErrorPageMapper</span><br><span class="line">at org.spark-project.jetty.server.handler.ErrorHandler.handle (ErrorHandler.java:71)</span><br><span class="line">at org.spark-project.jetty.server.Response.sendError (Response.java:349)</span><br><span class="line">at javax.servlet.http.HttpServletResponseWrapper.sendError (HttpServletResponseWrapper.java:118)</span><br><span class="line">at org.spark-project.jetty.http.gzip.CompressedResponseWrapper.sendError (CompressedResponseWrapper.java:291)</span><br><span class="line">at org.spark-project.jetty.servlet.DefaultServlet.doGet (DefaultServlet.java:589)</span><br><span class="line">at javax.servlet.http.HttpServlet.service (HttpServlet.java:707)</span><br><span class="line">at javax.servlet.http.HttpServlet.service (HttpServlet.java:820)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHolder.handle (ServletHolder.java:684)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1507)</span><br><span class="line">at org.apache.hadoop.yarn.server.webproxy.amfilter.AmIpFilter.doFilter (AmIpFilter.java:164)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1478)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:499)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1086)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler.doScope (ServletHandler.java:427)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1020)</span><br><span class="line">at org.spark-project.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:135)</span><br><span class="line">at org.spark-project.jetty.server.handler.GzipHandler.handle (GzipHandler.java:264)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:255)</span><br><span class="line">at org.spark-project.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:116)</span><br><span class="line">at org.spark-project.jetty.server.Server.handle (Server.java:366)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection.handleRequest (AbstractHttpConnection.java:494)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection.headerComplete (AbstractHttpConnection.java:973)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete (AbstractHttpConnection.java:1035)</span><br><span class="line">at org.spark-project.jetty.http.HttpParser.parseNext (HttpParser.java:641)</span><br><span class="line">at org.spark-project.jetty.http.HttpParser.parseAvailable (HttpParser.java:231)</span><br><span class="line">at org.spark-project.jetty.server.AsyncHttpConnection.handle (AsyncHttpConnection.java:82)</span><br><span class="line">at org.spark-project.jetty.io.nio.SelectChannelEndPoint.handle (SelectChannelEndPoint.java:696)</span><br><span class="line">at org.spark-project.jetty.io.nio.SelectChannelEndPoint$1.run (SelectChannelEndPoint.java:53)</span><br><span class="line">at org.spark-project.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:608)</span><br><span class="line">at org.spark-project.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:543)</span><br><span class="line">at java.lang.Thread.run (Thread.java:748)</span><br><span class="line">2019-01-24_22:51:49 [qtp697001207-1591 - /static/spark-dag-viz.js] WARN server.AbstractHttpConnection:552: /static/spark-dag-viz.js</span><br><span class="line">java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.isAsyncStarted () Z</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:608)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1086)</span><br><span class="line">at org.spark-project.jetty.servlet.ServletHandler.doScope (ServletHandler.java:427)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1020)</span><br><span class="line">at org.spark-project.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:135)</span><br><span class="line">at org.spark-project.jetty.server.handler.GzipHandler.handle (GzipHandler.java:264)</span><br><span class="line">at org.spark-project.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:255)</span><br><span class="line">at org.spark-project.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:116)</span><br><span class="line">at org.spark-project.jetty.server.Server.handle (Server.java:366)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection.handleRequest (AbstractHttpConnection.java:494)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection.headerComplete (AbstractHttpConnection.java:973)</span><br><span class="line">at org.spark-project.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete (AbstractHttpConnection.java:1035)</span><br><span class="line">at org.spark-project.jetty.http.HttpParser.parseNext (HttpParser.java:641)</span><br><span class="line">at org.spark-project.jetty.http.HttpParser.parseAvailable (HttpParser.java:231)</span><br><span class="line">at org.spark-project.jetty.server.AsyncHttpConnection.handle (AsyncHttpConnection.java:82)</span><br><span class="line">at org.spark-project.jetty.io.nio.SelectChannelEndPoint.handle (SelectChannelEndPoint.java:696)</span><br><span class="line">at org.spark-project.jetty.io.nio.SelectChannelEndPoint$1.run (SelectChannelEndPoint.java:53)</span><br><span class="line">at org.spark-project.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:608)</span><br><span class="line">at org.spark-project.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:543)</span><br><span class="line">at java.lang.Thread.run (Thread.java:748)</span><br></pre></td></tr></table></figure><p>此外，还有一点值得注意，Chrome 浏览器的某些端口是禁止访问的，所以遇到过有一个 Spark 任务使用了 4045 端口【locked】，在 Chrome 浏览器是看不了任务状态的，页面无法打开，被 Chrome 浏览器屏蔽了，此时并不是 Spark 的问题。</p><h1 id="关于 -Git- 的小问题"><a href="# 关于 -Git- 的小问题" class="headerlink" title="关于 Git 的小问题"></a>关于 Git 的小问题</h1><p>1、本地版本落后，而且又与远程仓库冲突，git pull 报错警告，需要 merge，无法直接更新最新版本。下面的操作直接覆盖本地文件，强制更新到最新版本，本地未提交的更改会丢失。</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">git fetch --all</span><br><span class="line">git reset --hard origin/master</span><br></pre></td></tr></table></figure><p>2、在 2018 年 9 月的某一天，发现 Git 的代码推送总是需要输入帐号和密码，哪怕保存下来也不行，每次 push 都需要重新输入，感觉很奇怪。后来发现是版本太旧了，当时的版本是 v2.13.0，升级后的版本是 v2.18.0，升级后就恢复正常了。后来无意间在哪里看到过通知，说是 TSL 协议升级了，所以针对旧版本强制输入用户名密码，升级就可以解决。</p><p>备注一下，HTTPS 是在 TCP 和 HTTP 之间增加了 TLS【Transport Layer Security，传输层安全】，提供了内容加密、身份认证和数据完整性三大功能。TLS 的前身是 SSL【Secure Sockets Layer，安全套接字层】，由网景公司开发，后来被 IETF 标准化并改名。</p></div><div><div id="wechat_subscriber" style="display:block;padding:10px 0;margin:20px 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