Chris Nauroth created HDFS-9409:
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Summary: DataNode shutdown does not guarantee full shutdown of all
threads due to race condition.
Key: HDFS-9409
URL: https://issues.apache.org/jira/browse/HDFS-9409
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Reporter: Chris Nauroth
{{DataNode#shutdown}} is documented to return "only after shutdown is
complete". Even after completion of this method, it's possible that threads
started by the DataNode are still running. Race conditions in the shutdown
sequence may cause it to skip stopping and joining the {{BPServiceActor}}
threads.
This is likely not a big problem in normal operations, because these are daemon
threads that won't block overall process exit. It is more of a problem for
tests, because it makes it impossible to write reliable assertions that these
threads exited cleanly. For large test suites, it can also cause an
accumulation of unneeded threads, which might harm test performance.
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