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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1879) ReadOnly transactions generate WAL activity.
Date Sat, 03 Oct 2009 05:00:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761805#action_12761805
] 

stack commented on HBASE-1879:
------------------------------

Done.  Thanks for patch Clint.

> ReadOnly transactions generate WAL activity.
> --------------------------------------------
>
>                 Key: HBASE-1879
>                 URL: https://issues.apache.org/jira/browse/HBASE-1879
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>            Reporter: Clint Morgan
>            Assignee: Clint Morgan
>            Priority: Minor
>             Fix For: 0.20.1, 0.21.0
>
>         Attachments: 1879-v2.patch, 1879.patch
>
>
> Currently we write a start entry in the WAL each time a transaction starts, and a commit/abort
at the end of the transaction. This means read-only transactions unnecessarily generate two
WAL entries per region.
> Can avoid this by removing the start entry from the WAL (this is implicit in the first
trx OP entry we see), and only writing commit/abort when the transaction has a write.

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