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https://issues.apache.org/jira/browse/ZOOKEEPER-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16793253#comment-16793253
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yeshuangshuang commented on ZOOKEEPER-3211:
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[~maoling]
pain?is what?
If it's a compatibility issue, does it mean the program won't work? Now it
looks like the problem is at doIO, right? In the time period of the problem,
only the long connection will print "" likely client has closed socket; Other
short connections are not printed. Is there something wrong with socket IO?
The c library of zookeeper we use now is compiled on centos 7.0, but runs on
centos7.6
> 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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