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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-2142) Add "reduce memory usage because I tuned things poorly" feature
Date Tue, 08 Feb 2011 21:31:57 GMT

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

Brandon Williams edited comment on CASSANDRA-2142 at 2/8/11 9:30 PM:
---------------------------------------------------------------------

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 seeing 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.)

      was (Author: brandon.williams):
    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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