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https://issues.apache.org/jira/browse/HDDS-377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elek, Marton updated HDDS-377:
------------------------------
Attachment: HDDS-377.001.patch
> Make the ScmClient closable and stop the started threads
> --------------------------------------------------------
>
> Key: HDDS-377
> URL: https://issues.apache.org/jira/browse/HDDS-377
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Components: SCM Client
> Reporter: Elek, Marton
> Assignee: Elek, Marton
> Priority: Major
> Fix For: 0.2.1
>
> Attachments: HDDS-377.001.patch
>
>
> Current ScmClient class opens additional threads which won't be closed. For
> example SCMCLI can't stop because of this running thread:
> {code}
> "nioEventLoopGroup-2-1" #15 prio=10 os_prio=0 tid=0x00007f1c84c74800
> nid=0x77f4 runnable [0x00007f1c52238000]
> java.lang.Thread.State: RUNNABLE
> at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
> at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
> at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
> at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
> - locked <0x0000000771adf7b0> (a
> org.apache.ratis.shaded.io.netty.channel.nio.SelectedSelectionKeySet)
> - locked <0x0000000771ae12d8> (a java.util.Collections$UnmodifiableSet)
> - locked <0x0000000771ae1010> (a sun.nio.ch.EPollSelectorImpl)
> at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
> at
> org.apache.ratis.shaded.io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
> at
> org.apache.ratis.shaded.io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:753)
> at
> org.apache.ratis.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:409)
> at
> org.apache.ratis.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
> at
> org.apache.ratis.shaded.io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> (Note this is netty, but the Grpc based xceiver also have some special
> threads).
> I propose to make ScmClient auto-closable and stop the XceiverClientManager
> in case of close.
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