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https://issues.apache.org/jira/browse/HDFS-15249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17076943#comment-17076943
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Hudson commented on HDFS-15249:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #18122 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/18122/])
HDFS-15249 ThrottledAsyncChecker is not thread-safe. (#1922) (github: rev 
c12ddbd1de40b32bbe2f6a3e484abf843d6d92ae)
* (edit) 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/ThrottledAsyncChecker.java


> ThrottledAsyncChecker is not thread-safe.
> -----------------------------------------
>
>                 Key: HDFS-15249
>                 URL: https://issues.apache.org/jira/browse/HDFS-15249
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: federation
>            Reporter: Toshihiro Suzuki
>            Assignee: Toshihiro Suzuki
>            Priority: Major
>             Fix For: 3.4.0
>
>
> ThrottledAsyncChecker should be thread-safe because it can be used by 
> multiple threads when we have multiple namespaces.
> *checksInProgress* and *completedChecks* are respectively HashMap and 
> WeakHashMap which are not thread-safe. So we need to put them in synchronized 
> block whenever we access them.



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