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https://issues.apache.org/jira/browse/FLINK-7818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201111#comment-16201111
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Till Rohrmann commented on FLINK-7818:
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Once the {{MetricStore}} is thread safe, we can remove the synchronization.
> Synchronize MetricStore access in the TaskManagersHandler
> ---------------------------------------------------------
>
> Key: FLINK-7818
> URL: https://issues.apache.org/jira/browse/FLINK-7818
> Project: Flink
> Issue Type: Bug
> Components: Metrics, REST
> Affects Versions: 1.4.0, 1.3.2
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
>
> The {{TaskManagersHandler}} accesses the {{MetricStore}} when details for a
> single {{TaskManager}} are requested. The access is not synchronized which
> can be problematic because the {{MetricStore}} is not thread safe.
> I propose to add synchronization.
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