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https://issues.apache.org/jira/browse/HDFS-15249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17071448#comment-17071448
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Wei-Chiu Chuang commented on HDFS-15249:
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[~brfrn169] I assume you saw ConcurrentModificationException thrown in the
DataNode. Can you post the stacktrace for future reference?
> 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
>
> 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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