[jira] [Commented] (CASSANDRA-12228) Write performance regression in 3.x vs 3.0

["Ariel Weisberg (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15400133#comment-15400133 ] 

Ariel Weisberg commented on CASSANDRA-12228:
--------------------------------------------

There are some remaining issues with thread pool sizes. See [CASSANDRA-12071|https://issues.apache.org/jira/browse/CASSANDRA-12071?focusedCommentId=15400086&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15400086].

You still can't get multiple threads if you have a single disk.  Seems like this would be a good place to address the related issue. I also don't think this is minor it's pretty crippling for performance and you can't work around it by changing configuration values.

> Write performance regression in 3.x vs 3.0
> ------------------------------------------
>
>                 Key: CASSANDRA-12228
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12228
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: T Jake Luciani
>            Assignee: Marcus Eriksson
>            Priority: Minor
>             Fix For: 3.9
>
>
> I've been tracking down a performance issue in trunk vs cassandra-3.0 branch.
> I think I've found it.  CASSANDRA-6696 changed the default memtable flush default to 1 vs the min of 2 in cassandra-3.0.
> I don't see any technical reason for this and we should add back the min of 2 sstable flushers per disk.



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