Lokesh Jain created HDDS-2342:
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Summary: ContainerStateMachine$chunkExecutor threads hold onto
native memory
Key: HDDS-2342
URL: https://issues.apache.org/jira/browse/HDDS-2342
Project: Hadoop Distributed Data Store
Issue Type: Bug
Components: Ozone Datanode
Reporter: Lokesh Jain
Assignee: Lokesh Jain
In a heap dump many threads in ContainerStateMachine$chunkExecutor holds onto
native memory in the ThreadLocal map. Every such thread holds onto chunk worth
of DirectByteBuffer. Since these threads are involved in write and read chunk
operations, the JVM allocates chunk (16MB) worth of DirectByteBuffer in the
ThreadLocalMap for every thread involved in IO. Also the native memory would
not be GC'ed as long as the thread is alive.
It would be better to reduce the default number of chunk executor threads and
have them in proportion to number of disks on the datanode.
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