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https://issues.apache.org/jira/browse/CASSANDRA-12228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15403197#comment-15403197
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Ariel Weisberg edited comment on CASSANDRA-12228 at 8/3/16 2:34 PM:
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|[trunk|https://github.com/apache/cassandra/compare/trunk...aweisberg:CASSANDRA-12228-trunk?expand=1]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-trunk-testall/1/]|[dtest|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/]|[dtest|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-trunk?expand=1]|[utest|https://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-12228-trunk-testall/1/]|[dtest|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.
> 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: 3.10
>
>
> 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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