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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-12228) Write performance regression in 3.x vs 3.0
Date Tue, 02 Aug 2016 01:45:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15403197#comment-15403197
] 

Ariel Weisberg edited comment on CASSANDRA-12228 at 8/2/16 1:45 AM:
--------------------------------------------------------------------

|[3.9|https://github.com/apache/cassandra/compare/cassandra-3.9...aweisberg:CASSANDRA-12228-3.9?expand=1]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-3.9-testall/1/]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-3.9-dtest/1/]|
|[trunk|https://github.com/apache/cassandra/compare/trunk...aweisberg:CASSANDRA-12228-3.9?expand=1]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-trunk-testall/1/]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-trunk-dtest/1/]|

I set the default back to the calculation that existed before and updated the documentation.
I would like to remove memtable_cleanup_threshold scoped as part of this ticket. I can't see
why you would set that to anything other than the default calculation and removing it would
help offset the additional lines of doc for memtable_flush_writers.

Somewhat orthogonal regarding my earlier comments about too much memory utilization. I created
CASSANDRA-12358 for that.


was (Author: aweisberg):
|[3.9|https://github.com/apache/cassandra/compare/cassandra-3.9...aweisberg:CASSANDRA-12228-3.9?expand=1]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-3.9-testall/1/]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-3.9-dtest/1/]|
|[trunk|https://github.com/apache/cassandra/compare/trunk...aweisberg:CASSANDRA-12228-3.9?expand=1]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-trunk-testall/1/]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-trunk-dtest/1/]|

> 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: Ariel Weisberg
>            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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