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Posted to commits@cassandra.apache.org by "Chris Lohfink (Jira)" <ji...@apache.org> on 2020/10/02 14:45:00 UTC
[jira] [Comment Edited] (CASSANDRA-16161) Validation Compactions
causing Java GC pressure
[ https://issues.apache.org/jira/browse/CASSANDRA-16161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17206225#comment-17206225 ]
Chris Lohfink edited comment on CASSANDRA-16161 at 10/2/20, 2:44 PM:
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While tangental to adding a throttle, offheap merkle trees and some of the perf improvements (ie xor impl and more aggressive dereferencing) has helped a lot as well (CASSANDRA-15202). Its a lot better in 4.0 from my experiences.
For 3.x though I agree that validation compaction is brutal and this could provide a workaround to keep functioning. Only question I think is if the compaction throughput throttle should be shared vs creating a new one but I am happy with this approach.
The code looks straight forward and am +1 to it. not sure about versions though
was (Author: clohfink):
While tangental to adding a throttle, offheap merkle trees and some of the perf improvements (ie xor impl and more aggressive dereferencing) has helped a lot as well (CASSANDRA-15202). Its a lot better in 4.0 from my experiences.
For 3.x though I agree that validation compaction is brutal and this could provide a workaround to keep functioning. Only question I think is if the compaction throughput throttle should be shared vs creating a new one but I am happy with this approach.
The code looks straight forward, +1
> Validation Compactions causing Java GC pressure
> -----------------------------------------------
>
> Key: CASSANDRA-16161
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16161
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Cameron Zemek
> Priority: Normal
> Fix For: 3.11.x, 3.11.8
>
> Attachments: 16161.patch
>
>
> Validation Compactions are not rate limited which can cause Java GC pressure and result in spikes in latency.
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