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https://issues.apache.org/jira/browse/HBASE-2482?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HBASE-2482:
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Attachment: hbase-2482.txt
Here's a preliminary patch that has gone through cluster testing, but could
probably still be improved a bit (needs unit tests, and I think a lot of the
meta/root special casing could be removed now)
Also please note the "I DONT BELIEVE YOU WILL EVER SEE THIS" message. If
someone can produce this message I will give them a cookie! Otherwise we should
remove this code.
I've been testing this for the last 9 hours or so with a RS failure once every
minute and no regions have "fallen out" of the cluster. Before this fix, it
used to "lose" a region after an hour or two.
> regions in transition do not get reassigned by master when RS crashes
> ---------------------------------------------------------------------
>
> Key: HBASE-2482
> URL: https://issues.apache.org/jira/browse/HBASE-2482
> Project: Hadoop HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.20.5
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Blocker
> Fix For: 0.20.5, 0.21.0
>
> Attachments: hbase-2482.txt
>
>
> Very similar to HBASE-1928, but for the general case (not just ROOT/META):
> If a region is in transition on a RS when the RS crashes, the master does not
> remove it from regionsInTransition when processing the RS shutdown. This is
> fairly easy to trigger by bringing up a RS and kill -9ing it just as it
> starts to get regions assigned. Those regions will get permanently lost since
> they're stuck in regionsInTransition and thus don't get assigned by the
> metascanner.
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