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https://issues.apache.org/jira/browse/CASSANDRA-21160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18093203#comment-18093203
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Abhijeet Dubey edited comment on CASSANDRA-21160 at 7/2/26 10:24 AM:
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||Metric||Baseline (26d6b4f665)||Patched (a8ab4c3875)||
|Writes completed (180s)|30,415|244,887 (~8.1x)|
|Avg write throughput|169/s|1,360/s|
|Write p99 (final)|11,798 ms|5.08 ms|
|Client queue-full drops|198,559 (87% of attempts)|77 (0.03%)|
|MutationStage peak Active|32 (pinned)|5|
|MutationStage peak Pending|135,674|0|
|Native-Transport peak Pending|19,082|1|
|Lock samples on VectorMemoryIndex (asprof -e lock)|84,143|1| |
Lock flame graphs
# [^lock-baseline-20260702-143332.html]
# [^lock-patched-20260702-144423.html]
was (Author: JIRAUSER306221):
||Metric||Baseline (26d6b4f665)||Patched (a8ab4c3875)||
|Writes completed (180s)|30,415|244,887 (~8.1x)|
|Avg write throughput|169/s|1,360/s|
|Write p99 (final)|11,798 ms|5.08 ms|
|Client queue-full drops|198,559 (87% of attempts)|77 (0.03%)|
|MutationStage peak Active|32 (pinned)|5|
|MutationStage peak Pending|135,674|0|
|Native-Transport peak Pending|19,082|1|
|Lock samples on VectorMemoryIndex (asprof -e lock)|84,143|1|
[^lock-baseline-20260702-143332.html]
[^lock-patched-20260702-144423.html]
> Make synchronization on VectorMemoryIndex inserts more granular
> ---------------------------------------------------------------
>
> Key: CASSANDRA-21160
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21160
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Feature/Vector Search
> Reporter: Michael Marshall
> Assignee: Caleb Rackliffe
> Priority: Normal
> Fix For: 5.0.x, 6.x, 7.x
>
> Attachments: ci_summary-1.html, ci_summary-2.html, ci_summary.html,
> lock-baseline-20260702-143332.html, lock-patched-20260702-144423.html,
> result_details.tar-1.gz, result_details.tar-2.gz, result_details.tar.gz
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> The `VectorMemoryIndex` supports asynchronous additions to the graph.
> However, the `synchronous` keyword for the `add` method prevents this and
> therefore means we are adding a point of contention that is unnecessary.
> As part of this ticket, we should verify my understanding that writes can be
> concurrent and then drop the keyword.
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