Feng Honghua created HBASE-10344:
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Summary: Improve writer performance by ignoring sync to hdfs when
an asyncer's writes have been synced by other asyncer
Key: HBASE-10344
URL: https://issues.apache.org/jira/browse/HBASE-10344
Project: HBase
Issue Type: Improvement
Reporter: Feng Honghua
Assignee: Feng Honghua
By fixing [HBASE-10329|https://issues.apache.org/jira/browse/HBASE-10329], we
know it's possible an asyncer's writes have been synced by other asyncer before
it starts to do the sync. We distinguish this case and handle accordingly when
the writer is null.
But when writer is not null(most of the time), we also can check and ignore the
sync if asyncer's writes have been synced by other asyncer before doing sync.
Since sync is a quite heavy operation(together with following notifying
notifier thread and log roll check) we can have some performance gain by
ignoring it for such case.
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