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Posted to commits@cassandra.apache.org by "Dmitry Konstantinov (Jira)" <ji...@apache.org> on 2026/04/06 13:59:00 UTC
[jira] [Updated] (CASSANDRA-21287) Reduce memory allocation in Cassandra read path
[ https://issues.apache.org/jira/browse/CASSANDRA-21287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dmitry Konstantinov updated CASSANDRA-21287:
--------------------------------------------
Description:
The epic accumulates improvements about reducing of memory allocations in Cassandra read path.
The drivers for this epic are:
* to reduce GC pressure -> reduce GC overhead and GC pauses frequency/duration. In case of low-latency GC reducing of memory allocation also helps to move forward the threshold when the system throughput is limited by the memory allocation throughput a GC is able to process without slowing down an app (allocation stalls).
* memory allocations also help to highlight the places to optimize from CPU usage point of view by just doing less work
> Reduce memory allocation in Cassandra read path
> -----------------------------------------------
>
> Key: CASSANDRA-21287
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21287
> Project: Apache Cassandra
> Issue Type: Epic
> Components: Consistency/Coordination, Local/Memtable, Local/SSTable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
>
> The epic accumulates improvements about reducing of memory allocations in Cassandra read path.
> The drivers for this epic are:
> * to reduce GC pressure -> reduce GC overhead and GC pauses frequency/duration. In case of low-latency GC reducing of memory allocation also helps to move forward the threshold when the system throughput is limited by the memory allocation throughput a GC is able to process without slowing down an app (allocation stalls).
> * memory allocations also help to highlight the places to optimize from CPU usage point of view by just doing less work
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