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https://issues.apache.org/jira/browse/ZOOKEEPER-4722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17885661#comment-17885661
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Kezhu Wang commented on ZOOKEEPER-4722:
---------------------------------------
Just in case, ZOOKEEPER-4508 changed the behavior in case of client can't reach
all servers in {{connectString}} from endless {{SessionTimeoutException}} to
{{KeeperState.Expired}}.
> Reproducible SessionTimeoutException for ZK3.5.7 and higher
> -----------------------------------------------------------
>
> Key: ZOOKEEPER-4722
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4722
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.5.7, 3.5.8, 3.6.2, 3.8.0, 3.7.1
> Reporter: Olivier Tavard
> Priority: Minor
>
> Hello Zookeeper team,
> I am contributing to the Apache ManifoldCF project, which is heavily relying
> on Zookeeper, and I encountered a reproducible error for which we – the
> ManifoldCF team - need your help:
> As part of its output connectors regular updates (ManifoldCF is a data
> crawler that can send analysed documents to designated destination
> applications), we are upgrading the Apache Solr output connector so that it
> is compatible with Solr 9.2. This version of Solr uses Apache Zookeeper
> 3.8.0, but when using the same Zookeeper version on the Apache ManifoldCF
> side, we experienced reproducible tests failures on the Solr Output Connector
> of ManifoldCF when building the project.
> We were able to pass tests with ZK up to version 3.5.6 included, but all of
> the more recent versions fail [4].
> To ease your evaluation of the problem, we have prepared a fork of Apache
> ManifoldCF where you can work and reproduce the issue [1]. The branch to be
> used is CONNECTORS-1740, and the build procedure is as follows (the issue
> occurs during the testings phase):
> git checkout CONNECTORS-1740
>
> Now, in order to build with ant (exclusively with Java 11 otherwise it will
> not work)
> First, Fetch the dependencies :
> ant clean make-core-deps
>
> Next, start the build itself:
> ant clean build
>
> You will get a success message for both commands.
>
> Then start the MCF tests (this is what will trigger the error [4]):
> ant run-tests-framework
> Thanks in advance for your help.
> Best regards,
> Olivier
>
> [1] https://gitlab.datafari.com/sandboxespublic/manifoldcf
> You can find here the email thread about this problem on the Apache
> ManifoldCF developer Mailing List [2], as well as the jira issue dedicated to
> it [3].
> [2] https://lists.apache.org/thread/3zx7c5nm23j6wfb0okf5xb01t9jb6lph
> [3] https://issues.apache.org/jira/browse/CONNECTORS-1740
> [4] Error logs we get:
> [junit] org.apache.zookeeper.ClientCnxn$SessionTimeoutException: Client
> session timed out, have not heard from server in 2007ms for session id 0x0
> [junit] at
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1250)
> [junit] [reader] INFO org.apache.zookeeper.ZooKeeper - Session: 0x0 closed
> [junit] [reader-EventThread] INFO org.apache.zookeeper.ClientCnxn -
> EventThread shut down for session: 0x0
> [junit] [reader] INFO org.apache.zookeeper.ZooKeeper - Initiating client
> connection, connectString=localhost:8348 sessionTimeout=2000
> watcher=org.apache.manifoldcf.core.lockmanager.ZooKeeperConnection$ZooKeeperWatcher@45c66a27
> [junit] [reader] INFO org.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer
> value is 1048575 Bytes
> [junit] [reader] INFO org.apache.zookeeper.ClientCnxn -
> zookeeper.request.timeout value is 0. feature enabled=false
> [junit] [reader-SendThread(localhost:8348)] INFO
> org.apache.zookeeper.ClientCnxn - Opening socket connection to server
> localhost/127.0.0.1:8348.
> [junit] [reader-SendThread(localhost:8348)] INFO
> org.apache.zookeeper.ClientCnxn - SASL config status: Will not attempt to
> authenticate using SASL (unknown error)
> [junit] [reader-SendThread(localhost:8348)] WARN
> org.apache.zookeeper.ClientCnxn - Client session timed out, have not heard
> from server in 2008ms for session id 0x0
> [junit] [reader-SendThread(localhost:8348)] WARN
> org.apache.zookeeper.ClientCnxn - An exception was thrown while closing send
> thread for session 0x0.
> [junit] org.apache.zookeeper.ClientCnxn$SessionTimeoutException: Client
> session timed out, have not heard from server in 2008ms for session id 0x0
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