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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-8875) ZkStateWriter.writePendingUpdates() can return null clusterState; NPE in Overseer
Date Tue, 29 Mar 2016 15:37:25 GMT

     [ https://issues.apache.org/jira/browse/SOLR-8875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Smiley updated SOLR-8875:
-------------------------------
    Summary: ZkStateWriter.writePendingUpdates() can return null clusterState; NPE in Overseer
 (was: ZkStateWriter.writePendingUpdates() can return null CollectionState; NPE in Overseer)

I just pushed a branch by the name of this issue.  It has one edit from SOLR-5750's branch,
which is to cause an assertion failure instead of just logging an error.  Simply run TestCloudBackupRestore.

> 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
>
> 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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