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https://issues.apache.org/jira/browse/HBASE-6258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402882#comment-13402882
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Jonathan Hsieh commented on HBASE-6258:
---------------------------------------
I think part of HBASE-4816 seems low risk (extra closing checks on
splitrequest) but the part eventually gets rooted to HBASE-1502 (removing
heartbeats) so sounds like it is best to probably avoid.
In discussion you mentioned that HBASE-4881 was pointless because the exception
signature changed between 0.90 and 0.92 and suggested not including it. I'd be
fine with that.
HBASE-6158 is embarrassing and a simple fix, but it sounds best to avoid
porting the fix to avoid the potential for compatibility problems. The good
news is that this one has an easy work around (don't use merges or splits as
colfams). Instead can we add a patch to warn if a user tries to create/alter
tables to have 'merges' or 'splits' as column families names?
HBASE-5189: I think metrics are always useful and seem low risk (I don't think
we have a strict contract staying that adding metrics breaks compatibility).
Since this is 0.94, ff we backport this to 0.90 we'd need to get into 0.92 as
well.
> Backport some region splitting fixes into 0.90.7
> ------------------------------------------------
>
> Key: HBASE-6258
> URL: https://issues.apache.org/jira/browse/HBASE-6258
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.90.6
> Reporter: David S. Wang
> Assignee: David S. Wang
> Attachments: HBASE-4816+4881+5189+6158.patch
>
>
> Issue tracking backport of some relatively small region splitting fixes into
> 0.90.7:
> HBASE-4816: Regionserver wouldn't go down because split happened exactly at
> same time we issued bulk user region close call on our way out - fixed in 0.92
> HBASE-4881: Unhealthy region is on service caused by rollback of region
> splitting - fixed in 0.92
> HBASE-5189: Add metrics to keep track of region-splits in RS - fixed in 0.94
> HBASE-6158: Data loss if the words 'merges' or 'splits' are used as Column
> Family name - fixed in 0.92 and 0.94
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