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https://issues.apache.org/jira/browse/HBASE-25334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17248497#comment-17248497
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Xiaolin Ha commented on HBASE-25334:
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I looked through the branch-2 and branch-2.4 failed dashboard, but cannot find
any useful running logs for the failed TestRSGroupsFallback.testFallback.
!image-2020-12-13-10-15-55-445.png|width=665,height=159!
Is it failed at assertRegionsInGroup() after balance()? If so, maybe because
waiting time is less than region correction time.
The async and throttle in balance() making region movement intermittent, as a
result, just waiting for TEST_UTIL.waitUntilAllRegionsAssigned is not enough.
> TestRSGroupsFallback.testFallback is flaky
> ------------------------------------------
>
> Key: HBASE-25334
> URL: https://issues.apache.org/jira/browse/HBASE-25334
> Project: HBase
> Issue Type: Test
> Reporter: Xiaolin Ha
> Assignee: Xiaolin Ha
> Priority: Major
> Attachments: image-2020-12-13-10-15-55-445.png
>
>
> Like in CI test results of PR [https://github.com/apache/hbase/pull/2699]
> failed UTs site is
> [https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2699/3/artifact/yetus-jdk8-hadoop3-check/output/patch-unit-hbase-server.txt]
>
> In this unit test, it checks if all table regions assigned after balance, and
> then assert for the RS group of regions.
> But balance() uses aync move, and will throttle move regions, sleeping
> between all the table regions are moved to its RSGroup.
> If waiting time is not longer than the region movement duration, the
> assertion will be fail.
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