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https://issues.apache.org/jira/browse/HDDS-1398?focusedWorklogId=223829&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-223829
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ASF GitHub Bot logged work on HDDS-1398:
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Author: ASF GitHub Bot
Created on: 05/Apr/19 20:22
Start Date: 05/Apr/19 20:22
Worklog Time Spent: 10m
Work Description: arp7 commented on pull request #697: HDDS-1398.
Concurrency issue in SCMConnectionManager#getValues
URL: https://github.com/apache/hadoop/pull/697
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Issue Time Tracking
-------------------
Worklog Id: (was: 223829)
Time Spent: 20m (was: 10m)
> Concurrency issue in SCMConnectionManager#getValues
> ---------------------------------------------------
>
> Key: HDDS-1398
> URL: https://issues.apache.org/jira/browse/HDDS-1398
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Reporter: Doroszlai, Attila
> Assignee: Doroszlai, Attila
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> {{testStartStopDatanodeStateMachine}} is flaky, causing [occasional
> pre-commit build
> failures|https://builds.apache.org/job/hadoop-multibranch/job/PR-691/1/artifact/out/patch-unit-hadoop-hdds_container-service.txt].
> HDDS-1332 added some logging to find out more about the cause.
> I think the problem is not test-specific, and is caused by the following:
> {{SCMConnectionManager#scmMachines}} is a plain {{HashMap}}, guarded by a
> {{ReadWriteLock}} in most places where it's used, except {{getValues()}}.
> The method also returns the values collection without any write protection
> (though currently none of the callers modify it).
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