[jira] [Updated] (CASSANDRA-15511) Utilising BTree Improvements

["Benjamin Lerer (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-15511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benjamin Lerer updated CASSANDRA-15511:
---------------------------------------
    Test and Documentation Plan: The changes are covered by exisitng unit tests  (was: AtomicBTreePartitionUpdateBench included. Some unit tests to come.)
                         Status: Patch Available  (was: In Progress)

The PR for the 4.0 branch can be found [here|https://github.com/apache/cassandra/pull/1646] and the CI results can be found [here|https://app.circleci.com/pipelines/github/blerer/cassandra/300/workflows/6950b3c5-168b-43c4-a9d8-a16bdcace345]

> 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.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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