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https://issues.apache.org/jira/browse/CASSANDRA-15511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict Elliott Smith updated CASSANDRA-15511:
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Change Category: Performance
Complexity: Normal
Assignee: Benedict Elliott Smith
Status: Open (was: Triage Needed)
> Utilising BTree Improvements
> ----------------------------
>
> Key: CASSANDRA-15511
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15511
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Other
> Reporter: Benedict Elliott Smith
> Assignee: Benedict Elliott Smith
> Priority: Normal
>
> This patch utilises CASSANDRA-15510 to improve throughput and reduce garbage
> produced by a number of common operations, by employing
> {{transformAndFilter}}, {{transform}} and {{FastBuilder}}
> {{Row}}, {{Cell}} and {{ComplexColumnData}} cloning are implemented with
> {{BTree.transform}}, so no special builders are necessary; {{Rows.copy}}
> removed
> {{Rows.merge}} implemented using {{BTree.update}} and a {{ColumnData}}
> reconciler
> Zero-allocations if result of merge is same as {{existing}}
> Fewer comparisons
> {{ColumnData}} reconciler implemented in same manner
> {{Cells.reconcileComplex}} is retired
> {{ComplexColumnData}} reconciliation now
> Garbage-free if the merge has no effect
> Always fewer allocations
> Fewer comparisons
> {{FastBuilder}} employed widely:
> {{ClusteringIndexNamesFilter}} deserialization
> {{Columns}} deserialization
> {{PartitionUpdate}} deserialization
> {{AbstractBTreePartition}} construction
> Misc others
> The upshot of this work when combined with the proposed patch for
> CASSANDRA-15367 has a dramatic impact on operations over collection types -
> under contention, as much as 100x improved throughput, and hundreds of
> megabytes of reduced allocations. For all operations, allocations under
> contention and no contention are significantly reduced and throughput
> improved.
> I am still awaiting the final results of the comprehensive performance
> comparison for {{AtomicBTreePartition}}, after which I will establish what
> impact there might be on compaction and normal reads, both of which should be
> affected by this patch.
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