[jira] [Updated] (CASSANDRA-20267) Reduce heap pressure when initializing the CMS

["Marcus Eriksson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-20267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marcus Eriksson updated CASSANDRA-20267:
----------------------------------------
          Fix Version/s: 5.1
                             (was: 5.x)
          Since Version: 5.1-alpha1
    Source Control Link: https://github.com/apache/cassandra/commit/415eaffb9cc50df5a12a330e14027ef60c07ee02
             Resolution: Fixed
                 Status: Resolved  (was: Ready to Commit)

> Reduce heap pressure when initializing the CMS
> ----------------------------------------------
>
>                 Key: CASSANDRA-20267
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20267
>             Project: Apache Cassandra
>          Issue Type: Bug
>          Components: Transactional Cluster Metadata
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Normal
>             Fix For: 5.1
>
>         Attachments: ci_summary.html
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When running {{nodetool cms initialize}} we currently request the full gossip-initialized cluster metadata from all replicas in the cluster and compare them. This doesn't work in large clusters.
> Instead the CMS initiator should send out a reduced version of its cluster metadata to all replicas (excluding the placements because they can be calculated based on tokenMap+schema+directory). The replicas then reply "yes/no" if their local metadata matches.



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