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https://issues.apache.org/jira/browse/HBASE-12424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell updated HBASE-12424:
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Attachment: HowHBaseRegionSplitsareImplemented.pdf
See attached document 'HowHBaseRegionSplitsareImplemented.pdf', a capture of
content from the Hortonworks blog with annotations by me, which describes the
various steps of a split transaction.
> 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
>
> Attachments: HowHBaseRegionSplitsareImplemented.pdf
>
>
> 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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