Hadoop HUJI: Measurement Hook-Points

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Hadoop 0.21 Hook Points

1. Mapper Input:

  • Location: org.apache.hadoop.hdfs.BlockReader.readChunk()

2. Reducer Input:

  • Location #1: org.apache.hadoop.mapreduce.task.reduce.Fetcher.shuffleToMemory()
  • Location #2: org.apache.hadoop.mapreduce.task.reduce.Fetcher.shuffleToDisk()

3. HDFS Writes:

  • Location: org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock()

Hadoop 0.20.2 (CDH3) Hook Points

1. (TBD)

2. Reducer Input:

  • Location #1: mapred.org.apache.hadoop.mapred.ReduceTask.ReduceCopier.MapOutputCopier.shuffleInMemory()
  • Location #2: mapred.org.apache.hadoop.mapred.ReduceTask.ReduceCopier.MapOutputCopier.shuffleToDisk()

3. HDFS Writes:

  • hdfs.org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock()
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