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From "Clint Morgan (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1879) ReadOnly transactions generate WAL activity.
Date Thu, 01 Oct 2009 21:03:23 GMT
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
             Fix For: 0.20.1, 0.21.0


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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