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https://issues.apache.org/jira/browse/ZOOKEEPER-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16931231#comment-16931231
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yeshuangshuang commented on ZOOKEEPER-3211:
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[~eolivelli]
please check the newly log “zookeeper.log”。
2019-09-16 04:01:59,457 [myid:] - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many
connections from /127.0.0.1 - max is 60
2019-09-16 04:01:59,457 [myid:] - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many
connections from /127.0.0.1 - max is 60
2019-09-16 04:01:59,459 [myid:] - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many
connections from /127.0.0.1 - max is 60
2019-09-16 04:01:59,461 [myid:] - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many
connections from /127.0.0.1 - max is 60
2019-09-16 04:01:59,461 [myid:] - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many
connections from /127.0.0.1 - max is 60
2019-09-16 04:01:59,461 [myid:] - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many
connections from /127.0.0.1 - max is 60
2019-09-16 04:01:59,463 [myid:] - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many
connections from /127.0.0.1 - max is 60
2019-09-16 04:01:59,463 [myid:] - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many
connections from /127.0.0.1 - max is 60
> 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, zookeeper.log
>
> 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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