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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12668) Memtable Contention in 2.1
Date Mon, 19 Sep 2016 20:01:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504509#comment-15504509
] 

Brandon Williams commented on CASSANDRA-12668:
----------------------------------------------

My suggestion would be to ttop it (https://github.com/aragozin/jvm-tools) to see where the
garbage is coming from.

> Memtable Contention in 2.1
> --------------------------
>
>                 Key: CASSANDRA-12668
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12668
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: sankalp kohli
>
> We added a new Btree implementation in 2.1 which causes write performance to go down
in Cassandra if there is  lot of contention in the memtable for a CQL partition. Upgrading
a cluster from 2.0 to 2.1 with contention causes the cluster to fall apart due to GC. We tried
making the defaults added in CASSANDRA-7546 configurable but that did not help. Is there anyway
to fix this issue?



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