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https://issues.apache.org/jira/browse/CASSANDRA-12870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15932770#comment-15932770
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Edward Capriolo commented on CASSANDRA-12870:
---------------------------------------------
The common case is probably a few tables however some users have 20k tables
etc.
> Calculate pending ranges for identical KS settings just once
> ------------------------------------------------------------
>
> Key: CASSANDRA-12870
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12870
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Stefan Podkowinski
> Assignee: Stefan Podkowinski
> Fix For: 4.x
>
> Attachments: 12870-trunk.patch
>
>
> The {{TokenMetadata.calculatePendingRanges()}} operation can be very
> expensive and already has been subject to micro optimization in
> CASSANDRA-9258. Instead of further optimizing the calculation itself, I'd
> like to prevent it from being executed as often by only calling it just once
> for all keyspaces sharing identical replication settings.
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