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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HADOOP-6196) sync(0); next() breaks SequenceFile
Date Sat, 05 Sep 2009 23:36:57 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas reopened HADOOP-6196:
-----------------------------------


No patch fixing this issue has been integrated into 0.21, yet; a committer needs to review
and approve the patch before it can be pushed to the repository and we can resolve the issue
as "fixed." I'm reopening the issue and marking it "patch available" again.

Considering the pain of writing incompatible SequenceFiles, I'm leaning away from bumping
the version and just going with the compatible change to the reader. If the modified Reader
approach seems hackish or I'm overestimating the pain of bumping the version, I'm open to
the alternate strategy, but unless we have formats that call sync(0) regularly it seems like
a reasonable workaround.

> sync(0); next() breaks SequenceFile
> -----------------------------------
>
>                 Key: HADOOP-6196
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6196
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Jay Booth
>            Assignee: Jay Booth
>             Fix For: 0.21.0
>
>         Attachments: C6196-0.patch, C6196-test.patch, hadoop-6196-multipatch.txt, sync-bug.patch
>
>
> Currently, the end of the SequenceFile header is a sync block that isn't prefaced with
SYNC_ESCAPE.  This means that sync(0) followed by next() fails.  Patch w/ test attached, bumps
VERSION from 6 to 7.

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