ReadOnly transactions generate WAL activity.
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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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