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https://issues.apache.org/jira/browse/HBASE-28533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17842562#comment-17842562
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Hudson commented on HBASE-28533:
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Results for branch branch-2
[build #1046 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2/1046/]:
(x) *{color:red}-1 overall{color}*
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> Split procedure rollback can leave parent region state in SPLITTING after
> completion
> ------------------------------------------------------------------------------------
>
> Key: HBASE-28533
> URL: https://issues.apache.org/jira/browse/HBASE-28533
> Project: HBase
> Issue Type: Bug
> Components: Region Assignment
> Affects Versions: 2.5.8, 3.0.0-beta-2
> Reporter: Daniel Roudnitsky
> Assignee: Daniel Roudnitsky
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.4.18, 2.7.0, 3.0.0-beta-2, 2.6.1, 2.5.9
>
>
> Depending on where the split procedure fails, SplitTableRegionProcedure
> rollback can leave the parent region's in memory RegionStateNode in SPLITTING
> after rollback is complete, when the parent region is still online on the
> assigned region server and according to meta. This leaves active HMaster
> believing that the parent region is offline according to its RegionStates,
> and causes subsequent procedures that require the region to be online like
> merge/split/move to fail to start. One workaround is to restart active
> HMaster to reset the in memory record of region states.
> Two example scenarios where this can happen:
> * If we get to SPLIT_TABLE_REGION_CLOSE_PARENT_REGION and the parent region
> has a replica which is in transition, the unassign procedure in that step is
> never created/rolled back and we are left with the parent region state in
> splitting.
> * If region quotas are enabled and a split is run for a region whose
> namespace is at its maximum region quota limit we will fail in
> SPLIT_TABLE_REGION_PRE_OPERATION with QuotaExceededException and we are left
> with the parent region state in splitting
> The region replica case is demonstrated in
> TestSplitTableRegionProcedure.testRollbackForSplitTableRegionWithReplica.
> To reproduce the region quota case in HBase shell:
> {code:java}
> > create_namespace 'test_ns', {'hbase.namespace.quota.maxregions'=> 2}
> > create 'test_ns:test_table', 'f1', {NUMREGIONS => 2, SPLITALGO =>
> > 'UniformSplit'}
> > region_a = <first region from list_regions 'test_ns:test_table'>
> > region_b = <second region from list_regions 'test_ns:test_table'>
> > split region_a, 'x'
> # HMaster will report:
> pid=405, state=ROLLEDBACK,
> exception=org.apache.hadoop.hbase.quotas.QuotaExceededException via
> master-split-regions:org.apache.hadoop.hbase.quotas.QuotaExceededException:
> Region split not possible for :<region_a> as quota limits are exceeded ;
> SplitTableRegionProcedure table=test_ns:test_table, parent=...
> > merge_region region_a, region_b
> ERROR: org.apache.hadoop.hbase.exceptions.MergeRegionException:
> org.apache.hadoop.hbase.client.DoNotRetryRegionException: <region_a> is not
> OPEN; state=SPLITTING
> > stop_master # trigger hmaster failover
> > merge_region region_a, region_b # merge now succeeds {code}
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