[ https://issues.apache.org/jira/browse/CASSANDRA-15511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benedict Elliott Smith updated CASSANDRA-15511: ----------------------------------------------- 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. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org