check-in remote shuffle based on DAOS Object API (#5)

* reconstruct project and add new shuffle-daos plugin Signed-off-by: jiafu zhang <jiafu.zhang@intel.com> * corrected location of scalastyle-config Signed-off-by: jiafu zhang <jiafu.zhang@intel.com> * use daos-java version of 1.1.4 Signed-off-by: jiafu zhang <jiafu.zhang@intel.com>
oap-project · Feb 1, 2021 · 99e53f0 · 99e53f0
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diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# Remote Shuffle
+# Remote Shuffle Plugins
 
 ## Online Documentation
 
@@ -9,10 +9,18 @@ You can find the all the PMem Spill documents on the [project web page](https://
 - [User Guide](#userguide)
 
 ## Introduction
-Remote Shuffle is a Spark* ShuffleManager plugin, shuffling data through a remote Hadoop-compatible file system, as opposed to vanilla Spark's local-disks.
+Remote Shuffle is a Spark* ShuffleManager plugin, shuffling data through a remote datastore, as opposed to vanilla Spark's local-disks.
 
 This is an essential part of enabling Spark on disaggregated compute and storage architecture.
 
+There are two shuffle plugins in this project.
+- shuffle-hadoop, A remote shuffle plugin based Hadoop filesystem.
+    This plugin can work with any remote filesystems compatible with Hadoop, like HDFS, AWS S3 and [DAOS](https://github.com/daos-stack/daos).
+- shuffle-daos
+    Different from the above general plugin based on Hadoop Filesystem interface, this plugin bases on DAOS Object API.
+    Thanks to DAOS Distribution Key and Attribute Key, we can improve performance by constructing shuffle output like
+    below.
+    ![](./shuffle-daos/images/shuffle.png)
 
 ### Installation
 We have provided a Conda package which will automatically install dependencies needed by OAP, you can refer to [OAP-Installation-Guide](./docs/OAP-Installation-Guide.md) for more information. If you have finished [OAP-Installation-Guide](./docs/OAP-Installation-Guide.md), you can find compiled OAP jars in `$HOME/miniconda2/envs/oapenv/oap_jars/`.
@@ -23,12 +31,12 @@ We have provided a Conda package which will automatically install dependencies n
 We have provided a Conda package which will automatically install dependencies needed by OAP, you can refer to [OAP-Installation-Guide](./docs/OAP-Installation-Guide.md) for more information. If you have finished [OAP-Installation-Guide](./docs/OAP-Installation-Guide.md), you can find compiled remote shuffle jars under `$HOME/miniconda2/envs/oapenv/oap_jars`.
 Then just skip this section and jump to [User Guide](#user-guide).
 
-Build this module using the following command in `OAP/oap-shuffle/remote-shuffle` folder. This file needs to be deployed on every compute node that runs Spark. Manually place it on all nodes or let resource manager do the work.
+Build using the following command in `OAP/remote-shuffle` folder. This file needs to be deployed on every compute node that runs Spark. Manually place it on all nodes or let resource manager do the work.
 
 ```
     mvn -DskipTests clean package 
 ```
-## User Guide
+## <a name="g1"></a>User Guide (shuffle-hadoop)
 ### Enable Remote Shuffle
 
 Add the `.jar` files to the classpath of Spark driver and executors: Put the
@@ -212,3 +220,25 @@ shuffle reader:
     shuffle storage      daos://default:1
     shuffle folder:      /tmp/shuffle                                                      
 ```
+
+## User Guide (shuffle-daos)
+
+Most of [User Guide (shuffle-hadoop)](#g1) can be applied to shuffle-daos. We'll not repeat them here. Just show
+differences here.
+
+### Shuffle Manager
+
+```
+    spark.shuffle.manager                      org.apache.spark.shuffle.daos.DaosShuffleManager
+```
+
+### Classpath
+
+```
+    spark.executor.extraClassPath          $HOME/miniconda2/envs/oapenv/oap_jars/daos-java-<version>.jar
+        $HOME/miniconda2/envs/oapenv/oap_jars/hadoop-daos-<version>.jar
+        $HOME/miniconda2/envs/oapenv/oap_jars/shuffle-daos-<version>.jar
+    spark.driver.extraClassPath            $HOME/miniconda2/envs/oapenv/oap_jars/daos-java-<version>.jar
+        $HOME/miniconda2/envs/oapenv/oap_jars/hadoop-daos-<version>.jar
+        $HOME/miniconda2/envs/oapenv/oap_jars/shuffle-daos-<version>.jar
+```