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https://issues.apache.org/jira/browse/SOLR-15968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17485675#comment-17485675
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Jan Høydahl commented on SOLR-15968:
------------------------------------
This isn't a critical error, just causing some noise. The linked ZOOKEEPER
issue is not even fixed so we don't know whether it becomes part of zk 3.8.0 or
not. I'm happy with just logging ERROR for now, and if a fix is released before
our final RC we can consider, but not a blocker.
> bin/solr zk always throws exception
> -----------------------------------
>
> Key: SOLR-15968
> URL: https://issues.apache.org/jira/browse/SOLR-15968
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Jan Høydahl
> Priority: Critical
> Time Spent: 10m
> Remaining Estimate: 0h
>
> To reproduce:
> {code}
> bin/solr start -c
> bin/solr zk ls /configs/_default
> {code}
> You will see a response like this
> {code}
> $ solr zk ls /configs/_default/
> managed-schema
> protwords.txt
> solrconfig.xml
> synonyms.txt
> stopwords.txt
> lang
> WARN - 2022-02-01 13:14:48.160; org.apache.zookeeper.ClientCnxn; An
> exception was thrown while closing send thread for session 0x200008ad548000a.
> => EndOfStreamException: Unable to read additional data from server sessionid
> 0x200008ad548000a, likely server has closed socket
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:77)
> org.apache.zookeeper.ClientCnxn$EndOfStreamException: Unable to read
> additional data from server sessionid 0x200008ad548000a, likely server has
> closed socket
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:77)
> ~[zookeeper-3.6.2.jar:3.6.2]
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)
> ~[zookeeper-3.6.2.jar:3.6.2]
> at
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1275)
> ~[zookeeper-3.6.2.jar:3.6.2]
> {code}
> The command seems to succeed, so this is more an unclean shutdown of
> zookeeper client.
> The same error message can be seen in Jenkins tests, such as this
> https://jenkins.thetaphi.de/view/Solr/job/Solr-main-Windows/612/testReport/junit/org.apache.solr.cloud/SolrCLIZkUtilsTest/testCp/
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