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https://issues.apache.org/jira/browse/HBASE-25829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337508#comment-17337508
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Andrew Kyle Purtell commented on HBASE-25829:
---------------------------------------------
The data from the test cluster is gone.
bq. Are these regions in RIT (splitting / splitting_new)?
No, there was no RIT.
bq. So far I see setRegionLocation(null) references for legit purposes like
closing region, closing it abruptly, failed open etc. Haven't seen setting this
null for splitting case.
The regions were closed. Somehow the region states persisted in the master's
data structures.
When I went to use HBCK2's {{setRegionState}} it said the state of the regions
in question was CLOSED yet each time through the balancer chore the INFO log
lines from RegionState would print.
> SPLIT state detritus
> --------------------
>
> Key: HBASE-25829
> URL: https://issues.apache.org/jira/browse/HBASE-25829
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.4.3
> Reporter: Andrew Kyle Purtell
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.5.0, 2.4.3
>
>
> Seen after an integration test (see HBASE-25824) with 'calm' monkey, so this
> happened in the happy path.
> There were no errors accessing all loaded table data. The integration test
> writes a log to HDFS of every cell written to HBase and the verify phase uses
> that log to read each value and confirm it. That seems fine:
> {noformat}
> 2021-04-30 02:16:33,316 INFO [main]
> test.IntegrationTestLoadCommonCrawl$Verify: REFERENCED: 154943544
> 2021-04-30 02:16:33,316 INFO [main]
> test.IntegrationTestLoadCommonCrawl$Verify: UNREFERENCED: 0
> 2021-04-30 02:16:33,316 INFO [main]
> test.IntegrationTestLoadCommonCrawl$Verify: CORRUPT: 0
> {noformat}
> However whenever the balancer runs there are a number of concerning INFO
> level log messages printed of the form _assignment.RegionStates: Skipping, no
> server for state=SPLIT, location=null, table=TABLENAME_
> For example:
> {noformat}
> 2021-04-30 02:02:09,286 INFO [master/ip-172-31-58-47:8100.Chore.2]
> assignment.RegionStates: Skipping, no server for state=SPLIT, location=null,
> table=IntegrationTestLoadCommonCrawl, region=087fb2f7847c2fc0a0b85eb30a97036e
> 2021-04-30 02:02:09,286 INFO [master/ip-172-31-58-47:8100.Chore.2]
> assignment.RegionStates: Skipping, no server for state=SPLIT, location=null,
> table=IntegrationTestLoadCommonCrawl, region=0952b94a920454afe9c40becbb7bf205
> 2021-04-30 02:02:09,286 INFO [master/ip-172-31-58-47:8100.Chore.2]
> assignment.RegionStates: Skipping, no server for state=SPLIT, location=null,
> table=IntegrationTestLoadCommonCrawl, region=f87a8b993f7eca2524bf2331b7ee3c06
> 2021-04-30 02:02:09,286 INFO [master/ip-172-31-58-47:8100.Chore.2]
> assignment.RegionStates: Skipping, no server for state=SPLIT, location=null,
> table=IntegrationTestLoadCommonCrawl, region=74bb28864a120decdf0f4956741df745
> 2021-04-30 02:02:09,286 INFO [master/ip-172-31-58-47:8100.Chore.2]
> assignment.RegionStates: Skipping, no server for state=SPLIT, location=null,
> table=IntegrationTestLoadCommonCrawl, region=bc918b609ade0ae4d5530f0467354cae
> 2021-04-30 02:02:09,286 INFO [master/ip-172-31-58-47:8100.Chore.2]
> assignment.RegionStates: Skipping, no server for state=SPLIT, location=null,
> table=IntegrationTestLoadCommonCrawl, region=183a199984539f3917a2f8927fe01572
> 2021-04-30 02:02:09,286 INFO [master/ip-172-31-58-47:8100.Chore.2]
> assignment.RegionStates: Skipping, no server for state=SPLIT, location=null,
> table=IntegrationTestLoadCommonCrawl, region=6cc5ce4fb4adc00445b3ec7dd8760ba8
> {noformat}
> The HBCK chore notices them but does nothing:
> "Loaded *80 regions* from in-memory state of AssignmentManager"
> "Loaded *73 regions from 5 regionservers' reports* and found 0 orphan regions"
> "Loaded 3 tables 80 regions from filesystem and found 0 orphan regions"
> Yes, there are exactly 7 region state records of SPLIT state with
> server=null.
> {noformat}
> 2021-04-30 02:02:09,300 INFO [master/ip-172-31-58-47:8100.Chore.1]
> master.HbckChore: Loaded 80 regions from in-memory state of AssignmentManager
> 2021-04-30 02:02:09,300 INFO [master/ip-172-31-58-47:8100.Chore.1]
> master.HbckChore: Loaded 73 regions from 5 regionservers' reports and found 0
> orphan regions
> 2021-04-30 02:02:09,306 INFO [master/ip-172-31-58-47:8100.Chore.1]
> master.HbckChore: Loaded 3 tables 80 regions from filesystem and found 0
> orphan regions
> {noformat}
> This repeats indefinitely.
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