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Added FixedLengthBinaryInputFormat and RecordReader from freeman-lab …
…and added them to both the JavaSparkContext and the SparkContext as fixedLengthBinaryFile
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95 changes: 95 additions & 0 deletions
95
core/src/main/scala/org/apache/spark/input/FixedLengthBinaryInputFormat.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.input | ||
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| import org.apache.hadoop.fs.Path | ||
| import org.apache.hadoop.io.{BytesWritable, LongWritable} | ||
| import org.apache.hadoop.mapreduce.lib.input.FileInputFormat | ||
| import org.apache.hadoop.mapreduce.{InputSplit, JobContext, RecordReader, TaskAttemptContext} | ||
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| /** | ||
| * Custom Input Format for reading and splitting flat binary files that contain records, each of which | ||
| * are a fixed size in bytes. The fixed record size is specified through a parameter recordLength | ||
| * in the Hadoop configuration. | ||
| */ | ||
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| object FixedLengthBinaryInputFormat { | ||
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| /** | ||
| * This function retrieves the recordLength by checking the configuration parameter | ||
| * | ||
| */ | ||
| def getRecordLength(context: JobContext): Int = { | ||
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| // retrieve record length from configuration | ||
| context.getConfiguration.get("recordLength").toInt | ||
| } | ||
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| } | ||
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| class FixedLengthBinaryInputFormat extends FileInputFormat[LongWritable, BytesWritable] { | ||
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| /** | ||
| * Override of isSplitable to ensure initial computation of the record length | ||
| */ | ||
| override def isSplitable(context: JobContext, filename: Path): Boolean = { | ||
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| if (recordLength == -1) { | ||
| recordLength = FixedLengthBinaryInputFormat.getRecordLength(context) | ||
| } | ||
| if (recordLength <= 0) { | ||
| println("record length is less than 0, file cannot be split") | ||
| false | ||
| } else { | ||
| true | ||
| } | ||
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| } | ||
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| /** | ||
| * This input format overrides computeSplitSize() to make sure that each split | ||
| * only contains full records. Each InputSplit passed to FixedLengthBinaryRecordReader | ||
| * will start at the first byte of a record, and the last byte will the last byte of a record. | ||
| */ | ||
| override def computeSplitSize(blockSize: Long, minSize: Long, maxSize: Long): Long = { | ||
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| val defaultSize = super.computeSplitSize(blockSize, minSize, maxSize) | ||
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| // If the default size is less than the length of a record, make it equal to it | ||
| // Otherwise, make sure the split size is as close to possible as the default size, | ||
| // but still contains a complete set of records, with the first record | ||
| // starting at the first byte in the split and the last record ending with the last byte | ||
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| defaultSize match { | ||
| case x if x < recordLength => recordLength.toLong | ||
| case _ => (Math.floor(defaultSize / recordLength) * recordLength).toLong | ||
| } | ||
| } | ||
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| /** | ||
| * Create a FixedLengthBinaryRecordReader | ||
| */ | ||
| override def createRecordReader(split: InputSplit, context: TaskAttemptContext): | ||
| RecordReader[LongWritable, BytesWritable] = { | ||
| new FixedLengthBinaryRecordReader | ||
| } | ||
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| var recordLength = -1 | ||
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| } |
144 changes: 144 additions & 0 deletions
144
core/src/main/scala/org/apache/spark/input/FixedLengthBinaryRecordReader.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.input | ||
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| import java.io.IOException | ||
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| import org.apache.hadoop.fs.FSDataInputStream | ||
| import org.apache.hadoop.io.compress.CompressionCodecFactory | ||
| import org.apache.hadoop.io.{BytesWritable, LongWritable} | ||
| import org.apache.hadoop.mapreduce.lib.input.FileSplit | ||
| import org.apache.hadoop.mapreduce.{InputSplit, RecordReader, TaskAttemptContext} | ||
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| /** | ||
| * | ||
| * FixedLengthBinaryRecordReader is returned by FixedLengthBinaryInputFormat. | ||
| * It uses the record length set in FixedLengthBinaryInputFormat to | ||
| * read one record at a time from the given InputSplit. | ||
| * | ||
| * Each call to nextKeyValue() updates the LongWritable KEY and BytesWritable VALUE. | ||
| * | ||
| * KEY = record index (Long) | ||
| * VALUE = the record itself (BytesWritable) | ||
| * | ||
| */ | ||
| class FixedLengthBinaryRecordReader extends RecordReader[LongWritable, BytesWritable] { | ||
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| override def close() { | ||
| if (fileInputStream != null) { | ||
| fileInputStream.close() | ||
| } | ||
| } | ||
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| override def getCurrentKey: LongWritable = { | ||
| recordKey | ||
| } | ||
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| override def getCurrentValue: BytesWritable = { | ||
| recordValue | ||
| } | ||
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| override def getProgress: Float = { | ||
| splitStart match { | ||
| case x if x == splitEnd => 0.0.toFloat | ||
| case _ => Math.min(((currentPosition - splitStart) / (splitEnd - splitStart)).toFloat, 1.0).toFloat | ||
| } | ||
| } | ||
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| override def initialize(inputSplit: InputSplit, context: TaskAttemptContext) { | ||
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| // the file input | ||
| val fileSplit = inputSplit.asInstanceOf[FileSplit] | ||
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| // the byte position this fileSplit starts at | ||
| splitStart = fileSplit.getStart | ||
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| // splitEnd byte marker that the fileSplit ends at | ||
| splitEnd = splitStart + fileSplit.getLength | ||
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| // the actual file we will be reading from | ||
| val file = fileSplit.getPath | ||
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| // job configuration | ||
| val job = context.getConfiguration | ||
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| // check compression | ||
| val codec = new CompressionCodecFactory(job).getCodec(file) | ||
| if (codec != null) { | ||
| throw new IOException("FixedLengthRecordReader does not support reading compressed files") | ||
| } | ||
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| // get the record length | ||
| recordLength = FixedLengthBinaryInputFormat.getRecordLength(context) | ||
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| // get the filesystem | ||
| val fs = file.getFileSystem(job) | ||
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| // open the File | ||
| fileInputStream = fs.open(file) | ||
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| // seek to the splitStart position | ||
| fileInputStream.seek(splitStart) | ||
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| // set our current position | ||
| currentPosition = splitStart | ||
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| } | ||
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| override def nextKeyValue(): Boolean = { | ||
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| if (recordKey == null) { | ||
| recordKey = new LongWritable() | ||
| } | ||
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| // the key is a linear index of the record, given by the | ||
| // position the record starts divided by the record length | ||
| recordKey.set(currentPosition / recordLength) | ||
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| // the recordValue to place the bytes into | ||
| if (recordValue == null) { | ||
| recordValue = new BytesWritable(new Array[Byte](recordLength)) | ||
| } | ||
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| // read a record if the currentPosition is less than the split end | ||
| if (currentPosition < splitEnd) { | ||
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| // setup a buffer to store the record | ||
| val buffer = recordValue.getBytes | ||
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| fileInputStream.read(buffer, 0, recordLength) | ||
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| // update our current position | ||
| currentPosition = currentPosition + recordLength | ||
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| // return true | ||
| return true | ||
| } | ||
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| false | ||
| } | ||
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| var splitStart: Long = 0L | ||
| var splitEnd: Long = 0L | ||
| var currentPosition: Long = 0L | ||
| var recordLength: Int = 0 | ||
| var fileInputStream: FSDataInputStream = null | ||
| var recordKey: LongWritable = null | ||
| var recordValue: BytesWritable = null | ||
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| } |