Chen Zhang created HDFS-14830:
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Summary: The calculation of DataXceiver count is not accurate
Key: HDFS-14830
URL: https://issues.apache.org/jira/browse/HDFS-14830
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Chen Zhang
DataNode use threadGroup.activeCount() as the number of DataXceiver, it's not
accurate since threadGroup includes not only DataXceiver thread and
DataXceiverServer thread, PacketResponder thread and BlockRecoveryWorker thread
is also in the same threadGroup.
In the worst case, the reported DataXceiver count maybe double of actual
count(e.g. all DataXceiver process write block operation, they create same
number of PacketResponder thread at the same time).
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