Andrew Purtell created HBASE-12424:
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Summary: Finer grained logging and metrics for split transactions
Key: HBASE-12424
URL: https://issues.apache.org/jira/browse/HBASE-12424
Project: HBase
Issue Type: Improvement
Reporter: Andrew Purtell
Fix For: 2.0.0, 0.98.8, 0.99.2
A split transaction is a complex orchestration of activity between the
RegionServer, Master, ZooKeeper, and HDFS NameNode. We have some visibility
into the time taken by various phases of the split transaction in the logs. We
will see "Starting split of region $PARENT" before the transaction begins,
before the parent is offlined. Later we will see "Opening $DAUGHTER" as one of
the last steps in the transaction, this is after the parent has been flushed,
offlined, and closed. Finally ""Region split, hbase:meta updated, and report to
master ... Split took $TIME" after all steps are complete and including the
total running time of the transaction.
For debugging the cause(s) of long running split transactions it would be
useful to know the distribution of time spent in all of the phases of the split
transaction.
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