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Wei-Chiu Chuang commented on HDFS-15249: ---------------------------------------- [~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. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org