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https://issues.apache.org/jira/browse/RATIS-857?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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runzhiwang updated RATIS-857:
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Attachment: RATIS-881.001.patch
> Thread unsafe RaftServerMetrics::metricsMap HashMap in multi thread
> -------------------------------------------------------------------
>
> Key: RATIS-857
> URL: https://issues.apache.org/jira/browse/RATIS-857
> Project: Ratis
> Issue Type: Bug
> Components: metrics
> Reporter: runzhiwang
> Assignee: runzhiwang
> Priority: Major
> Fix For: 0.6.0
>
> Attachments: RATIS-857.001.patch, RATIS-881.001.patch
>
>
> *What's the problem ?*
> The {color:#DE350B}static{color} variable
> [RaftServerMetrics::metricsMap|https://github.com/apache/incubator-ratis/blob/master/ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerMetrics.java#L71]
> is type of HashMap, which is not thread safe. But entry will be
> [put|https://github.com/apache/incubator-ratis/blob/master/ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerMetrics.java#L76]
> into metricsMap by different thread, when create each RaftServerImpl
> instance.
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