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https://issues.apache.org/jira/browse/ZOOKEEPER-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719680#comment-16719680
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Michael Han commented on ZOOKEEPER-3211:
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[~yss] Have you tried newer version of stable zookeeper release (e.g. 3.4.13),
as well as different versions of OS? 3.4.5 is a pretty old version.
> 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, zklog.rar
>
> 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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