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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9622) bzip2 codec can drop records when reading data in splits
Date Sat, 16 Nov 2013 11:25:22 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824444#comment-13824444
] 

Chris Douglas commented on HADOOP-9622:
---------------------------------------

+1 The unit test clearly demonstrates the bug and dropping records is severe enough that this
case should be fixed.

The comment is helpful, thanks for including it. {{inDelimiter}} is insufficient because {{LineReader::readDefaultLine}}
will match \n, while {{LineReader::readCustomLine}} would consider a partial match incomplete
and require an extra line? I looked briefly at the custom delimiter code, and I'm not seeing
how it handles splits that start in the middle of a delimiter. I must be missing something
obvious...

> bzip2 codec can drop records when reading data in splits
> --------------------------------------------------------
>
>                 Key: HADOOP-9622
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9622
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 2.0.4-alpha, 0.23.8
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: HADOOP-9622-2.patch, HADOOP-9622-testcase.patch, HADOOP-9622.patch,
blockEndingInCR.txt.bz2, blockEndingInCRThenLF.txt.bz2
>
>
> 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 [~knoguchi] for discovering this problem while working on PIG-3251.



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