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https://issues.apache.org/jira/browse/CASSANDRA-20486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-20486:
--------------------------------------------
Description:
An idea to evaluate: our memtables use sharding approach with a single writer
guarded by lock or use optimistic concurrency with retries in case of
contention, so when we have a high rate of writes we spend time/CPU for lock
parking/unparking or by contending on per partition optimistic locking.
!image-2025-03-26-21-03-21-342.png|width=300!
A possible way to reduce or even almost avoid such overheads can be applying
the same kind of sharding for write request threads.
was:
An idea to evaluate: our memtables use sharding approach with a single writer
guarded by lock or use optimistic concurrency with retries in case of
contention, so when we have a high rate of writes we spend time/CPU for lock
parking/unparking or by contending on optimistic locking.
!image-2025-03-26-21-03-21-342.png|width=300!
A possible way to reduce or even almost avoid such overheads can be applying
the same kind of sharding for write request threads.
> Apply memtable sharding to write request thread pool
> ----------------------------------------------------
>
> Key: CASSANDRA-20486
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20486
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Memtable
> Reporter: Dmitry Konstantinov
> Priority: Normal
> Attachments: image-2025-03-26-21-03-21-342.png
>
>
> An idea to evaluate: our memtables use sharding approach with a single writer
> guarded by lock or use optimistic concurrency with retries in case of
> contention, so when we have a high rate of writes we spend time/CPU for lock
> parking/unparking or by contending on per partition optimistic locking.
> !image-2025-03-26-21-03-21-342.png|width=300!
> A possible way to reduce or even almost avoid such overheads can be applying
> the same kind of sharding for write request threads.
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