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Date: Sat, 7 Apr 2012 22:26:17 +0000 (UTC)
From: "stack (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5720) HFileDataBlockEncoderImpl uses
 wrong header size when reading HFiles with no checksums
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    [ https://issues.apache.org/jira/browse/HBASE-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249386#comment-13249386 ] 

stack commented on HBASE-5720:
------------------------------

+1 on commit to 0.94.  Open a blocker issue for fix on TRUNK.

@Matt Sounds great.  How do we do it?  The testable and individually maintained riffs I like.  When you say separate directories or projects, what you thinking?  It'd be a separate package or even a separate module if we ever get around to modularizing our build.  Regards separate project, where you think?
                
> HFileDataBlockEncoderImpl uses wrong header size when reading HFiles with no checksums
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-5720
>                 URL: https://issues.apache.org/jira/browse/HBASE-5720
>             Project: HBase
>          Issue Type: Bug
>          Components: io, regionserver
>    Affects Versions: 0.94.0
>            Reporter: Matt Corgan
>            Priority: Blocker
>             Fix For: 0.94.0
>
>         Attachments: 5720-trunk-v2.txt, 5720-trunk.txt, 5720v4.txt, 5720v4.txt, 5720v4.txt, HBASE-5720-v1.patch, HBASE-5720-v2.patch, HBASE-5720-v3.patch
>
>
> When reading a .92 HFile without checksums, encoding it, and storing in the block cache, the HFileDataBlockEncoderImpl always allocates a dummy header appropriate for checksums even though there are none.  This corrupts the byte[].
> Attaching a patch that allocates a DUMMY_HEADER_NO_CHECKSUM in that case which I think is the desired behavior.

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