[jira] Reopened: (HBASE-1879) ReadOnly transactions generate WAL activity.

["Clint Morgan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Clint Morgan reopened HBASE-1879:
---------------------------------


please apply v2 to branch and trunk

> 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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