[jira] [Created] (HBASE-22867) The ForkJoinPool in CleanerChore will spawn thousands of threads in our cluster with thousands table

["Zheng Hu (JIRA)" <ji...@apache.org>]

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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