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https://issues.apache.org/jira/browse/SOLR-8875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15219229#comment-15219229
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David Smiley commented on SOLR-8875:
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This code is new to me but what you say resonates with me. I also got the
sense these two things were trying to keep track of the clusterState, and that
seems redundant. When I get back to SOLR-5750 in the next few days I'll apply
this and see if it goes away. If so I'll commit it. It'll be good to have
Jenkins beating on it for awhile.
> ZkStateWriter.writePendingUpdates() can return null clusterState; NPE in
> Overseer
> ---------------------------------------------------------------------------------
>
> Key: SOLR-8875
> URL: https://issues.apache.org/jira/browse/SOLR-8875
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: David Smiley
> Attachments: SOLR-8875.patch
>
>
> While trying to get the test in Varun's patch in SOLR-5750 (SolrCloud
> collection backup & restore) to succeed, I kept hitting an NPE in Overseer in
> which clusterState was null. I added a bunch of asserts and found where it
> was happening which I worked around temporarily. See
> https://github.com/apache/lucene-solr/commit/fd9c4d59e8dbe0e9fbd99a40ed2ff746c1ae7a0c#diff-9ed614eee66b9e685d73446b775dc043R247
> which is ZkStateWriter.writePendingUpdates() returning null, overwriting the
> current non-null clusterState. This happens nearly every time for me when I
> run that test.
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