Olivier Tavard created ZOOKEEPER-4722:
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Summary: 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
Reporter: Olivier Tavard
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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