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https://issues.apache.org/jira/browse/ZOOKEEPER-3828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17109952#comment-17109952
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Aishwarya Soni commented on ZOOKEEPER-3828:
-------------------------------------------
I gave the ticket as a reference as I thought it might be related to zookeeper
leader re-election. As the client is not able to connect only when the leader
node is restarted. Apologize if it created misinformation. The server logs are
clean. I checked it. It should be easily reproducible I feel. Our team is using
Solr and Storm both of which store metadata in the form of nodes. If you can
store some data with the nodes and restart the leader container, we might be
able to see this behavior. I just need to see if its docker related or infra
related or an actual zookeeper issue.
> zookeeper CLI client gets connection timeout when thee leader 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
>
> 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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