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https://issues.apache.org/jira/browse/CASSANDRA-21144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18055429#comment-18055429
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Sam Tunnicliffe commented on CASSANDRA-21144:
---------------------------------------------
CI results pretty much as expected
> writePlacementsAllSettled can perform poorly in large clusters with many
> ongoing range movements
> ------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21144
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21144
> 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
>
>
> In a large cluster with multiple concurrent range movements in flight,
> calculating the final state of data placements after all movements are
> completed can be a CPU intensive operation. This is done solely to predict
> the future local write ranges so that DiskBoundaryManager can locate SSTables
> correctly on disk and reduce the relocation required to balance disks.
> Calculating the outcome of every in-flight movement is overkill for this, as
> only the operations which affect the local node need to be considered.
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