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HDFS-16586. Purge FsDatasetAsyncDiskService threadgroup; it causes BP… (
apache#4338) * HDFS-16586. Purge FsDatasetAsyncDiskService threadgroup; it causes BPServiceActor IllegalThreadStateException 'fatal exception and exit' Remove the ThreadGroup used by executor factories; they are unused and ThreadGroups auto-destroy when their Thread-member count goes to zero. This behavior is incompatible with the configuration we have on the per-volume executor which is set to let all threads die if no use inside the keepalive time. Signed-off-by: Hexiaoqiao <hexiaoqiao@apache.org>
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