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https://issues.apache.org/jira/browse/CASSANDRA-21004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040318#comment-18040318
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Sam Tunnicliffe commented on CASSANDRA-21004:
---------------------------------------------
CI looks reasonable, only previously failing tests and nothing related to this
patch.
> Potential NPE when meta keyspace placements are empty before CMS is
> initialized
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-21004
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21004
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Transactional Cluster Metadata
> Reporter: Sam Tunnicliffe
> Assignee: Sam Tunnicliffe
> Priority: Normal
> Fix For: 6.x
>
> Attachments: ci_summary.html, result_details.tar.gz
>
>
> During an upgrade to trunk there is a window before the CMS is initialized
> where the {{system_cluster_metadata}} keyspace exists but is not replicated
> by any peers. At this time, if a JMX client invokes {{getRangeToEndpointMap}}
> on the {{org.apache.cassandra.db:type=StorageService}} mbean for this
> keyspace, it will trigger an NPE on the server.
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