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Posted to commits@cassandra.apache.org by "David Capwell (Jira)" <ji...@apache.org> on 2023/03/02 19:49:00 UTC
[jira] [Updated] (CASSANDRA-18212) Reduce memory allocations of calls to ByteBufer.duplicate() made in org.apache.cassandra.transport.CBUtil#writeValue
[ https://issues.apache.org/jira/browse/CASSANDRA-18212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Capwell updated CASSANDRA-18212:
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Status: Ready to Commit (was: Review In Progress)
> Reduce memory allocations of calls to ByteBufer.duplicate() made in org.apache.cassandra.transport.CBUtil#writeValue
> --------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18212
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18212
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/Local Write-Read Paths
> Reporter: Natnael Adere
> Assignee: Natnael Adere
> Priority: Normal
> Attachments: DiskBased.png, allocations-after.html, allocations-before.html
>
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> Currently, org.apache.cassandra.transport.CBUtil#writeValue(java.nio.ByteBuffer, io.netty.buffer.ByteBuf) calls ByteBufer.duplicate() and is found to be 20% of memory allocations in production. No changes have been made to reduce this but there is discussion related to the issue in CASSANDRA-13741. Attached below are the performance result for disk based queries and mostly memory based queries.
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