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https://issues.apache.org/jira/browse/HBASE-1756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12764266#action_12764266
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stack commented on HBASE-1756:
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Over in HBASE-189 the comment is that SequenceFile may be too heavy-weight for
our needs and the sync stuff in SF is not what we mean by sync (though the SF
file feature maybe something we should keep if we think corruption of wals a
problem and we want to recover all we can from a wal gone bad). Another reason
to do our own wal and not use SF is because currently SF does not support the
new 0.21 hadoop hdfs sync stuff (see ugly hacks in HLog to make SF.Writer and
SF.Reader work with hadoop hdfs 0.21 sync).
> Refactor HLog
> -------------
>
> Key: HBASE-1756
> URL: https://issues.apache.org/jira/browse/HBASE-1756
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Fix For: 0.21.0
>
>
> HLog has 1215 lines and we are going to add a lot of functionality. That file
> should be refactored.
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