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https://issues.apache.org/jira/browse/ZOOKEEPER-3828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17148394#comment-17148394
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Pavol Ipoth commented on ZOOKEEPER-3828:
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[~aishwaryasoni1991] yes also with 3.5.8

> zookeeper CLI client gets connection timeout when the leader node is restarted
> ------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-3828
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3828
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.6.1
>            Reporter: Aishwarya Soni
>            Priority: Minor
>         Attachments: debug_logs.zip, node1.txt, node2.txt, node3.txt, 
> node4.txt, node5.txt
>
>
> I have configured 5 nodes zookeeper cluster using 3.6.1 version in a docker 
> containerized environment. As a part of some destructive testing, I restarted 
> zookeeper leader. Now, re-election happened and all 5 nodes (containers) are 
> back in good state with new leader. But when I login to one of the container 
> and go inside zk Cli (./zkCli.sh) and run the cmd *ls /* I see below error,
>  {color:#000000} {color}
>  *{color:#000000}[zk: localhost:2181(CONNECTING) 1]{color}* 
> *{color:#000000}[zk: localhost:2181(CONNECTING) 1] ls /{color}*
> *{color:#000000}2020-05-14 23:48:26,556 [myid:localhost:2181] - WARN  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1229] - Client session 
> timed out, have not heard from server in 30001ms for session id 0x0{color}*
> *{color:#000000}2020-05-14 23:48:26,556 [myid:localhost:2181] - WARN  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1272] - Session 0x0 
> for sever localhost/127.0.0.1:2181, Closing socket connection. Attempting 
> reconnect except it is a SessionExpiredException.{color}*
> *{color:#000000}org.apache.zookeeper.ClientCnxn$SessionTimeoutException: 
> Client session timed out, have not heard from server in 30001ms for session 
> id 0x0{color}*
>  *{color:#000000}at 
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1230){color}*
> *{color:#000000}KeeperErrorCode = ConnectionLoss for /{color}*
> *{color:#000000}[zk: localhost:2181(CONNECTING) 2] 2020-05-14 23:48:28,089 
> [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1154] - Opening socket 
> connection to server localhost/127.0.0.1:2181.{color}*
> *{color:#000000}2020-05-14 23:48:28,089 [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1156] - SASL config 
> status: Will not attempt to authenticate using SASL (unknown error){color}*
> *{color:#000000}2020-05-14 23:48:28,090 [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@986] - Socket 
> connection established, initiating session, client: /127.0.0.1:60384, server: 
> localhost/127.0.0.1:2181{color}*
> *{color:#000000}2020-05-14 23:48:58,119 [myid:localhost:2181] - WARN  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1229] - Client session 
> timed out, have not heard from server in 30030ms for session id 0x0{color}*
> *{color:#000000}2020-05-14 23:48:58,120 [myid:localhost:2181] - WARN  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1272] - Session 0x0 
> for sever localhost/127.0.0.1:2181, Closing socket connection. Attempting 
> reconnect except it is a SessionExpiredException.{color}*
> *{color:#000000}org.apache.zookeeper.ClientCnxn$SessionTimeoutException: 
> Client session timed out, have not heard from server in 30030ms for session 
> id 0x0{color}*
>  *{color:#000000}at 
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1230){color}*
> *{color:#000000}2020-05-14 23:49:00,003 [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1154] - Opening socket 
> connection to server localhost/127.0.0.1:2181.{color}*
> *{color:#000000}2020-05-14 23:49:00,004 [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1156] - SASL config 
> status: Will not attempt to authenticate using SASL (unknown error){color}*
> *{color:#000000}2020-05-14 23:49:00,004 [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@986] - Socket 
> connection established, initiating session, client: /127.0.0.1:32936, server: 
> localhost/127.0.0.1:2181{color}*
> *{color:#000000}2020-05-14 23:49:30,032 [myid:localhost:2181] - WARN  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1229] - Client session 
> timed out, have not heard from server in 30029ms for session id 0x0{color}*
> *{color:#000000}2020-05-14 23:49:30,033 [myid:localhost:2181] - WARN  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1272] - Session 0x0 
> for sever localhost/127.0.0.1:2181, Closing socket connection. Attempting 
> reconnect except it is a SessionExpiredException.{color}*
> *{color:#000000}org.apache.zookeeper.ClientCnxn$SessionTimeoutException: 
> Client session timed out, have not heard from server in 30029ms for session 
> id 0x0{color}*
>  *{color:#000000}at 
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1230){color}*
> *{color:#000000}2020-05-14 23:49:31,230 [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1154] - Opening socket 
> connection to server localhost/127.0.0.1:2181.{color}*
> *{color:#000000}2020-05-14 23:49:31,230 [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@1156] - SASL config 
> status: Will not attempt to authenticate using SASL (unknown error){color}*
> *{color:#000000}2020-05-14 23:49:31,230 [myid:localhost:2181] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@986] - Socket 
> connection established, initiating session, client: /127.0.0.1:33766, server: 
> localhost/127.0.0.1:2181{color}*
> {color:#000000}Does anyone know what could possibly be wrong? For reference: 
> https://issues.apache.org/jira/browse/ZOOKEEPER-2164{color}
> This behavior is observed on all the nodes when the leader is restarted. All 
> is good when a follower is restarted.



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