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https://issues.apache.org/jira/browse/HDFS-16939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17698689#comment-17698689
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ASF GitHub Bot commented on HDFS-16939:
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zhangshuyan0 opened a new pull request, #5471:
URL: https://github.com/apache/hadoop/pull/5471
…. Contributed by Shuyan Zhang.
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### Description of PR
Cherry-pick from trunk.
The remove method in LowRedundancyBlocks is not protected by synchronized.
This method is private and is called by BlockManager. As a result,
priorityQueues has the risk of being accessed concurrently by multiple threads.
> Fix the thread safety bug in LowRedundancyBlocks
> ------------------------------------------------
>
> Key: HDFS-16939
> URL: https://issues.apache.org/jira/browse/HDFS-16939
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namanode
> Reporter: Shuyan Zhang
> Assignee: Shuyan Zhang
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> The remove method in LowRedundancyBlocks is not protected by synchronized.
> This method is private and is called by BlockManager. As a result,
> priorityQueues has the risk of being accessed concurrently by multiple
> threads.
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