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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8732) Changing Encoding on Column Families errors out
Date Mon, 15 Jul 2013 19:52:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708882#comment-13708882

Jean-Daniel Cryans commented on HBASE-8732:

So the problem is that {{HStore}} has a {{HFileDataBlockEncoderImpl}} which has a {{HFileBlockDefaultEncodingContext}}
which is not thread safe. {{onDiskBytesWithHeader}}, {{uncompressedBytesWithHeader}}, and
{{blockType}} are currently shared between threads without any protection so this mangles
the block headers.

HBASE-5521 added this code for HBASE-5313, but then it didn't go anywhere. I'm starting a
discussion in the latter to see what's going on, I'm thinking of reverting 5521 right now.
> Changing Encoding on Column Families errors out
> -----------------------------------------------
>                 Key: HBASE-8732
>                 URL: https://issues.apache.org/jira/browse/HBASE-8732
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.98.0, 0.95.1
>            Reporter: Elliott Clark
>            Assignee: Jean-Daniel Cryans
>            Priority: Critical
>             Fix For: 0.95.2
> Getting an error when opening a scanner on a file that has no encoding.

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