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https://issues.apache.org/jira/browse/ZOOKEEPER-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhangbo updated ZOOKEEPER-3211:
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Comment: was deleted
(was: 1. 是集群模式还是单机模式？看到log文件里面myid:3
2. OutOfMemory问题，`ulimit -u`看看是不是分配的用户线程数太少
3. 是生产环境发生的问题吗，有多少个应用连接到zk？)
> zookeeper单机版本部署，在centos7.0内核中偶现一个较严重问题，Server段默认的60个连接全部变为CLOSE_WATI状态且长时间不消除，导致zk无法正常提供服务
> ------------------------------------------------------------------------------------------
>
> 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.部署配置
> server.1=127.0.0.1:2902:2903
> 2.部署版本
> 内核：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: 72h
> Remaining Estimate: 72h
>
> 1.部署配置
> server.1=127.0.0.1:2902:2903
> 2.部署版本
> 内核：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.问题现象：不是必现问题，但是复现概率极高，起初是读写超时，大概耗时6s左右，过来几分钟后所有的连接（包括长连接）都成了CLOSE_WAIT状态。
> 4.目前手段：发现连接全部变为close_wait 主动重启zookeeper 服务端
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