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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-9622) bzip2 codec can drop records when reading data in splits
Date Thu, 13 Jun 2013 18:31:20 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-9622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Lowe updated HADOOP-9622:
-------------------------------

    Attachment: HADOOP-9622-2.patch

Added a discussion of the various use cases and assumption on how compressed input streams
read blocks to CompressSplitLineReader.
                
> 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: blockEndingInCRThenLF.txt.bz2, blockEndingInCR.txt.bz2, HADOOP-9622-2.patch,
HADOOP-9622.patch, HADOOP-9622-testcase.patch
>
>
> 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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