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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12228) Write performance regression in 3.x vs 3.0
Date Wed, 03 Aug 2016 14:02:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15405953#comment-15405953
] 

Sylvain Lebresne commented on CASSANDRA-12228:
----------------------------------------------

We even wrote stuff up: http://wiki.apache.org/cassandra/CompatibilityGuarantees, which while
absolutely imperfect is better than nothing. In particular:

bq. No removal/modifications of any configuration option, startup option, exposed metrics
or general behavior of the Cassandra process

> 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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