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  1. Hadoop Common
  2. HADOOP-3604

Reduce stuck at shuffling phase

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 0.18.0
    • Fix Version/s: 0.18.0
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      I was running gridmix with Hadoop 0.18.
      I set the map output compression to true.
      Most of the jobs completed just fine.
      Three jobs, however, got stuck.
      Each has one reducer stuck at shuffling phase.
      Here is the log:

      2008-06-20 00:06:01,264 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM Metrics with processName=SHUFFLE, sessionId=
      2008-06-20 00:06:01,415 INFO org.apache.hadoop.streaming.PipeMapRed: PipeMapRed exec [/bin/cat]
      2008-06-20 00:06:01,463 INFO org.apache.hadoop.mapred.ReduceTask: ShuffleRamManager: MemoryLimit=134217728, MaxSingleShuffleLimit=33554432
      2008-06-20 00:06:01,474 INFO org.apache.hadoop.util.NativeCodeLoader: Loaded the native-hadoop library
      2008-06-20 00:06:01,475 INFO org.apache.hadoop.io.compress.zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
      2008-06-20 00:06:01,476 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,477 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,477 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,478 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,478 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,486 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,486 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,487 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,487 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,488 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,488 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,489 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,489 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,489 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,493 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,496 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,496 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,496 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,497 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,497 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new decompressor
      2008-06-20 00:06:01,500 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0 Thread started: Thread for merging on-disk files
      2008-06-20 00:06:01,500 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0 Thread waiting: Thread for merging on-disk files
      2008-06-20 00:06:01,502 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0 Need another 270 map output(s) where 0 is already in progress
      2008-06-20 00:06:01,503 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0 Thread started: Thread for merging in memory files
      2008-06-20 00:06:01,503 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0: Got 0 new map-outputs & number of known map outputs is 0
      2008-06-20 00:06:01,504 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0 Scheduled 0 of 0 known outputs (0 slow hosts and 0 dup hosts)
      2008-06-20 00:06:06,654 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0: Got 269 new map-outputs & number of known map outputs is 269
      2008-06-20 00:06:06,656 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200806192318_0450_r_000016_0 Scheduled 229 of 269 known outputs (0 slow hosts and 40 dup hosts)
      2008-06-20 00:06:07,163 INFO org.apache.hadoop.mapred.ReduceTask: Shuffling 846183 bytes (210104 raw bytes) into RAM-FS from attempt_200806192318_0450_m_000089_0
      2008-06-20 00:06:07,163 INFO org.apache.hadoop.mapred.ReduceTask: Shuffling 820890 bytes (204371 raw bytes) into RAM-FS from attempt_200806192318_0450_m_000083_0
      2008-06-20 00:06:07,166 INFO org.apache.hadoop.mapred.ReduceTask: Shuffling 835672 bytes (208085 raw bytes) into RAM-FS from attempt_200806192318_0450_m_000122_0

        Attachments

        1. HADOOP-3604_4_20080630.patch
          28 kB
          Arun Murthy
        2. HADOOP-3604_3_20080627.patch
          24 kB
          Arun Murthy
        3. HADOOP-3604_3_20080627.patch
          24 kB
          Arun Murthy
        4. HADOOP-3604_2_20080625.patch
          23 kB
          Arun Murthy
        5. HADOOP-3604_1_20080624.patch
          23 kB
          Arun Murthy
        6. HADOOP-3604_1_20080624.patch
          12 kB
          Arun Murthy
        7. stack.txt
          59 kB
          Arun Murthy
        8. HADOOP-3604_0_20080623.patch
          1 kB
          Arun Murthy

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              • Assignee:
                acmurthy Arun Murthy
                Reporter:
                runping Runping Qi
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                Dates

                • Created:
                  Updated:
                  Resolved: