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137 changes: 137 additions & 0 deletions
137
...e/src/main/scala/org/apache/spark/sql/execution/streaming/state/StateStoreCDCReader.scala
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| * (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package org.apache.spark.sql.execution.streaming.state | ||
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| import org.apache.hadoop.fs.Path | ||
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| import org.apache.spark.internal.Logging | ||
| import org.apache.spark.io.CompressionCodec | ||
| import org.apache.spark.sql.catalyst.expressions.UnsafeRow | ||
| import org.apache.spark.sql.execution.streaming.CheckpointFileManager | ||
| import org.apache.spark.sql.types.StructType | ||
| import org.apache.spark.util.NextIterator | ||
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| /** | ||
| * Base class for state store changelog reader | ||
| * @param fm - checkpoint file manager used to manage streaming query checkpoint | ||
| * @param fileToRead - name of file to use to read changelog | ||
| * @param compressionCodec - de-compression method using for reading changelog file | ||
| */ | ||
| abstract class StateStoreCDCReader( | ||
| fm: CheckpointFileManager, | ||
| // fileToRead: Path, | ||
| stateLocation: Path, | ||
| startVersion: Long, | ||
| endVersion: Long, | ||
| compressionCodec: CompressionCodec, | ||
| keySchema: StructType, | ||
| valueSchema: StructType) | ||
| extends NextIterator[(RecordType.Value, UnsafeRow, UnsafeRow, Long)] with Logging { | ||
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| class ChangeLogFileIterator( | ||
| stateLocation: Path, | ||
| startVersion: Long, | ||
| endVersion: Long) extends Iterator[Path] { | ||
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| // assertions | ||
| assert(true) | ||
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| private var currentVersion = startVersion - 1 | ||
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| def getVersion: Long = currentVersion | ||
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| override def hasNext: Boolean = currentVersion < endVersion | ||
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| override def next(): Path = { | ||
| currentVersion += 1 | ||
| getChangelogPath(stateLocation, currentVersion) | ||
| } | ||
| } | ||
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| // private def decompressStream(inputStream: DataInputStream): DataInputStream = { | ||
| // val compressed = compressionCodec.compressedInputStream(inputStream) | ||
| // new DataInputStream(compressed) | ||
| // } | ||
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| // private val sourceStream = try { | ||
| // fm.open(fileToRead) | ||
| // } catch { | ||
| // case f: FileNotFoundException => | ||
| // throw QueryExecutionErrors.failedToReadStreamingStateFileError(fileToRead, f) | ||
| // } | ||
| // protected val input: DataInputStream = decompressStream(sourceStream) | ||
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| protected lazy val fileIterator = | ||
| new ChangeLogFileIterator(stateLocation, startVersion, endVersion) | ||
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| protected var changelogSuffix: String | ||
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| private def getChangelogPath(stateLocation: Path, version: Long): Path = | ||
| new Path(stateLocation, s"$version.$changelogSuffix") | ||
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| override def getNext(): (RecordType.Value, UnsafeRow, UnsafeRow, Long) | ||
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| def close(): Unit | ||
| // = { if (input != null) input.close() } | ||
| } | ||
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| class HDFSBackedStateStoreCDCReader( | ||
| fm: CheckpointFileManager, | ||
| stateLocation: Path, | ||
| startVersion: Long, | ||
| endVersion: Long, | ||
| compressionCodec: CompressionCodec, | ||
| keySchema: StructType, | ||
| valueSchema: StructType | ||
| ) | ||
| extends StateStoreCDCReader( | ||
| fm, stateLocation, startVersion, endVersion, compressionCodec, keySchema, valueSchema) { | ||
| override protected var changelogSuffix: String = "delta" | ||
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| private var currentChangelogReader: StateStoreChangelogReader = null | ||
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| override def getNext(): (RecordType.Value, UnsafeRow, UnsafeRow, Long) = { | ||
| while (currentChangelogReader == null || !currentChangelogReader.hasNext) { | ||
| if (!fileIterator.hasNext) { | ||
| finished = true | ||
| print("return 1\n") | ||
| return null | ||
| } | ||
| currentChangelogReader = | ||
| new StateStoreChangelogReaderV1(fm, fileIterator.next(), compressionCodec) | ||
| } | ||
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| print("return 2\n") | ||
| val readResult = currentChangelogReader.next() | ||
| val keyRow = new UnsafeRow(keySchema.fields.length) | ||
| keyRow.pointTo(readResult._2, readResult._2.length) | ||
| val valueRow = new UnsafeRow(valueSchema.fields.length) | ||
| valueRow.pointTo(readResult._3, readResult._3.length) | ||
| (readResult._1, keyRow, valueRow, fileIterator.getVersion - 1) | ||
| } | ||
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| // fix the problem when change if -> while will return null | ||
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| override def close(): Unit = { | ||
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| } | ||
| } |
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