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  1. Hadoop Map/Reduce
  2. MAPREDUCE-5656

bzip2 codec can drop records when reading data in splits

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Details

    • Bug
    • Status: Closed
    • Critical
    • Resolution: Fixed
    • 2.0.4-alpha, 0.23.8
    • 2.3.0
    • None
    • None
    • Reviewed

    Description

      Bzip2Codec.BZip2CompressionInputStream can cause records to be dropped when reading them in splits based on where record delimiters occur relative to compression block boundaries.

      Thanks to Koji Noguchi for discovering this problem while working on PIG-3251.

      Attachments

        1. blockEndingInCR.txt.bz2
          133 kB
          Jason Darrell Lowe
        2. blockEndingInCRThenLF.txt.bz2
          133 kB
          Jason Darrell Lowe
        3. HADOOP-9622.patch
          24 kB
          Jason Darrell Lowe
        4. HADOOP-9622-2.patch
          28 kB
          Jason Darrell Lowe
        5. HADOOP-9622-testcase.patch
          3 kB
          Jason Darrell Lowe
        6. MAPREDUCE-5656.patch
          370 kB
          Jason Darrell Lowe
        7. MAPREDUCE-5656-2.patch
          370 kB
          Jason Darrell Lowe

        Issue Links

        is duplicated by

        Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-5143 TestLineRecordReader has no test case for compressed files

        • Minor - Minor loss of function, or other problem where easy workaround is present.
        • Resolved
        relates to

        Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-5948 org.apache.hadoop.mapred.LineRecordReader does not handle multibyte record delimiters well

        • Critical - Crashes, loss of data, severe memory leak.
        • Closed

        Improvement - An improvement or enhancement to an existing feature or task. PIG-3251 Bzip2TextInputFormat requires double the memory of maximum record size

        • Major - Major loss of function.
        • Closed

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            jlowe Jason Darrell Lowe Assign to me
            jlowe Jason Darrell Lowe
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            Dates

              Created:
              Updated:
              Resolved:

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