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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-2142) Add "reduce memory usage because I tuned things poorly" feature
Date Tue, 08 Feb 2011 21:29:57 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992194#comment-12992194
] 

Brandon Williams commented on CASSANDRA-2142:
---------------------------------------------

Part of the problem there is the heap size of 128M is ridiculously small and you can insert
data quickly enough that CMS probably never gets a chance before it goes into the death spiral
I'm seen around 90% on various (1G+) heaps.  The threshold is too high though, although this
may ultimately depend on how much breathing room is left in the heap (and thus the size of
the heap itself.)

> Add "reduce memory usage because I tuned things poorly" feature
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-2142
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2142
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>              Labels: ponies
>             Fix For: 0.7.1
>
>         Attachments: 2142.txt
>
>
> Users frequently create too many columnfamilies, set the memtable thresholds too high
(or adjust throughput while ignoring operations), and/or set caching thresholds too high.
 Then their server OOMs and they tell their friends Cassandra sucks.

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