David Smiley created SOLR-8875:
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Summary: 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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