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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2862

Infinite loop in CombineFileInputFormat#getMoreSplits(), with missing blocks

    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None

      Description

      Hi, we met the infinite loop on CombineFileInputFormat#getMoreSplits().

      At first, we lost some blocks by mis-operation . Then, one job tried to use these missing blocks. At that time getMoreSplits() goes into the infinite loop.

      From our investigation, this List could be an empty array.
      > https://github.com/apache/hadoop-mapreduce/blob/trunk/src/java/org/apache/hadoop/mapreduce/lib/input/CombineFileInputFormat.java#L363

      Then 'for' loop just after that line does nothing, and entry is not removed from 'blockToNodes'.

      Finally this line goes into the infinite loop.
      > https://github.com/apache/hadoop-mapreduce/blob/trunk/src/java/org/apache/hadoop/mapreduce/lib/input/CombineFileInputFormat.java#L348

      We're now creating the patch against this problem...

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            • Assignee:
              Unassigned
              Reporter:
              kzk Kazuki Ohta
            • Votes:
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              Dates

              • Created:
                Updated: