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https://issues.apache.org/jira/browse/SOLR-15968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17567519#comment-17567519
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Eric Lavault commented on SOLR-15968:
-------------------------------------
ZOOKEEPER-4515, which incorporates ZOOKEEPER-4376 fixes the issue.
> bin/solr zk always throws exception
> -----------------------------------
>
> Key: SOLR-15968
> URL: https://issues.apache.org/jira/browse/SOLR-15968
> Project: Solr
> Issue Type: Bug
> Reporter: Jan Høydahl
> Assignee: Jan Høydahl
> Priority: Critical
> Fix For: 9.0, 8.11.2
>
> Time Spent: 20m
> 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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