Datanode prints tons of log messages: Waiting for threadgroup to exit, active
theads is XX
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Key: HADOOP-4679
URL: https://issues.apache.org/jira/browse/HADOOP-4679
Project: Hadoop Core
Issue Type: Bug
Reporter: Hairong Kuang
When a data receiver thread sees a disk error, it immediately calls shutdown to
shutdown DataNode. But the shutdown method does not return before all data
receiver threads exit, which will never happen. Therefore the DataNode gets
into a dead/live lock state, emitting tons of log messages: Waiting for
threadgroup to exit, active threads is XX.
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