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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1216) reconsider using SequenceFiles for the WAL
Date Thu, 28 Mar 2013 15:00:33 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616323#comment-13616323
] 

Keith Turner commented on ACCUMULO-1216:
----------------------------------------

bq. It supports metadata, which we now have to do ourselves. There's some underlying machinery
that can help with backward compatibility.

Can you give some more details on these points?
                
> reconsider using SequenceFiles for the WAL
> ------------------------------------------
>
>                 Key: ACCUMULO-1216
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1216
>             Project: Accumulo
>          Issue Type: Task
>          Components: tserver
>    Affects Versions: 1.5.0
>            Reporter: Eric Newton
>            Priority: Minor
>
> Observing the code in HBase we learned that WAL files written/flushed to HDFS would *not*
present the correct file size, which made using SequenceFile for WALs problematic.  So we
just write Writables.  In a sequence.
> However, it would be nice to go back and use SequenceFile.
> It might be possible since learning how to properly close a file.

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