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https://issues.apache.org/jira/browse/SOLR-8875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15215165#comment-15215165
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David Smiley commented on SOLR-8875:
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Thanks for investigating Scott. You need to comment out the modifications I
did in Overseer that avoid overwriting the cluster state with null. The rest
of Overseer changes outside this method should remain.
> ZkStateWriter.writePendingUpdates() can return null CollectionState; 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
>
> 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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