Sam Tunnicliffe created CASSANDRA-21144:
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Summary: 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
Reporter: Sam Tunnicliffe
Assignee: Sam Tunnicliffe
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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