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https://issues.apache.org/jira/browse/CASSANDRA-15511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17563223#comment-17563223
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Benjamin Lerer commented on CASSANDRA-15511:
--------------------------------------------
|| Branch || CI ||
|[4.0|https://github.com/apache/cassandra/pull/1646]|[j8|https://app.circleci.com/pipelines/github/blerer/cassandra/310/workflows/fdbdfe80-38d4-44da-82a4-87f1c0e2afc2]|
|[4.1|https://github.com/apache/cassandra/pull/1719]|[j8|https://app.circleci.com/pipelines/github/blerer/cassandra/311/workflows/8782993a-282f-48ae-94da-b97b32413956]|
|[trunk|https://github.com/apache/cassandra/pull/1720]|[j8|https://app.circleci.com/pipelines/github/blerer/cassandra/312/workflows/013a764a-c121-438c-9894-170d9c951510]|
> 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
> Fix For: 4.0.x, 4.1.x, 4.x
>
> Attachments: atomicbtreepartition.ods, atomicbtreepartition.xlsx.zip,
> perfsh.tar.gz
>
>
> 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.
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