Zheng Hu created HBASE-22867:
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Summary: The ForkJoinPool in CleanerChore will spawn thousands of
threads in our cluster with thousands table
Key: HBASE-22867
URL: https://issues.apache.org/jira/browse/HBASE-22867
Project: HBase
Issue Type: Bug
Reporter: Zheng Hu
The thousands of spawned threads make the safepoint cost 80+s in our Master
JVM processs.
{code}
2019-08-15,19:35:35,861 INFO [main-SendThread(zjy-hadoop-prc-zk02.bj:11000)]
org.apache.zookeeper.ClientCnxn: Client session timed out, have not heard from
server in 82260ms for sessionid 0x1691332e2d3aae5, closing socket connection
and at
tempting reconnect
{code}
The stdout from JVM (can see from here there's 9126 threads & sync cost 80+s)
{code}
vmop [threads: total initially_running wait_to_block]
[time: spin block sync cleanup vmop] page_trap_count
32358.859: ForceAsyncSafepoint [ 9126 67 474
] [ 1 28 86596 87 101 ] 0
{code}
Also we got the jstack:
{code}
$ cat 31162.stack.1 | grep 'ForkJoinPool-1-worker' | wc -l
8648
{code}
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