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https://issues.apache.org/jira/browse/ZOOKEEPER-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867386#comment-16867386
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Andor Molnar commented on ZOOKEEPER-3211:
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[~yss]
I agree with [~eolivelli] . TBH I can't see what's the issue here exactly:
client disconnects? ZK ensemble stops operating?
Also what's the bug in linux kernel? Have you identified the root cause already?
Please add more clarification, log files and evidence that the issue still
exists in a supported environment: Java8+, ZK 3.4.14 or close the Jira.
> zookeeper standalone mode，found a high level bug in kernel of centos7.0
> ，zookeeper Server's tcp/ip socket connections(default 60 ) are CLOSE_WAIT
> ，this lead to zk can't work for client any more
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3211
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3211
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.5
> Environment: 1.zoo.cfg
> server.1=127.0.0.1:2902:2903
> 2.kernel
> kernel：Linux localhost.localdomain 3.10.0-123.el7.x86_64 #1 SMP Tue Feb 12
> 19:44:50 EST 2019 x86_64 x86_64 x86_64 GNU/Linux
> JDK：
> java version "1.7.0_181"
> OpenJDK Runtime Environment (rhel-2.6.14.5.el7-x86_64 u181-b00)
> OpenJDK 64-Bit Server VM (build 24.181-b00, mixed mode)
> zk: 3.4.5
> Reporter: yeshuangshuang
> Priority: Blocker
> Fix For: 3.4.5
>
> Attachments: 1.log, 2018-12-09_124131.png, 2018-12-09_124210.png,
> 2018-12-09_132854.png, 2018-12-09_133017.png, 2018-12-09_133049.png,
> 2018-12-09_133111.png, 2018-12-09_133131.png, 2018-12-09_133150.png,
> 2018-12-09_133210.png, 2018-12-09_133229.png, 2018-12-09_133248.png,
> 2018-12-09_133320.png
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> 1.config--zoo.cfg
> server.1=127.0.0.1:2902:2903
> 2.kernel version
> version：Linux localhost.localdomain 3.10.0-123.el7.x86_64 #1 SMP Tue Feb 12
> 19:44:50 EST 2019 x86_64 x86_64 x86_64 GNU/Linux
> JDK：
> java version "1.7.0_181"
> OpenJDK Runtime Environment (rhel-2.6.14.5.el7-x86_64 u181-b00)
> OpenJDK 64-Bit Server VM (build 24.181-b00, mixed mode)
> zk: 3.4.5
> 3.bug details：
> Occasionally，But the recurrence probability is extremely high. At first, the
> read-write timeout takes about 6s, and after a few minutes, all connections
> (including long ones) will be CLOSE_WAIT state.
> 4.:Circumvention scheme: it is found that all connections become close_wait
> to restart the zookeeper server side actively
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