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https://issues.apache.org/jira/browse/SOLR-15968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536155#comment-17536155
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ASF subversion and git services commented on SOLR-15968:
--------------------------------------------------------

Commit 3f2329b616e2fd925052cde13d3dfa697ab2be7f in lucene-solr's branch 
refs/heads/branch_8_11 from Jan Høydahl
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=3f2329b616e ]

SOLR-15968 bin/solr zk always throws exception - change zk logging to ERROR 
level for SolrCLI (#586)

Backport from 
https://github.com/apache/solr/commit/38421ea20581e4f9d8f57dd2af631566f5947c10


> 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
>
>          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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