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https://issues.apache.org/jira/browse/HBASE-533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12602047#action_12602047
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Jean-Daniel Cryans commented on HBASE-533:
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Ok will fix both.
> Region Historian
> ----------------
>
> Key: HBASE-533
> URL: https://issues.apache.org/jira/browse/HBASE-533
> Project: Hadoop HBase
> Issue Type: Wish
> Reporter: Bryan Duxbury
> Assignee: Jean-Daniel Cryans
> Priority: Minor
> Attachments: hbase-533-v1-fix.patch, hbase-533-v1.patch,
> hbase-533-v2.patch, hbase-533-v3.patch, hbase-533-v4.patch
>
>
> Whenever we try to debug region splitting, assignment, compaction, etc.
> issues, we always end up having to look in 1-20 different log files for
> cryptic names of regions and try to piece together the chain of events
> ourselves. This is a challenging at best effort most of the time.
> What would be very useful would be a new utility I've nicknamed the Region
> Historian. You give it the text name of a region, and it will track down the
> log messages relevant to it in the master and regionserver logs. Then, it
> will interleave the messages in such a way that the timestamps correctly list
> the order of events. The result is a log summary that accurately describes
> what happened to a region during it's lifetime, making it much easier to try
> and figure out where something went wrong.
> Other things it could do would be replace cryptic log messages with simple
> events like "the region was split into a and b", "the region was assigned to
> server x", and trace the lineage of a region backwards to its parent before
> it came into existence.
> I'm sure there are other things we would think up that would be useful as
> well.
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