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From Apache Wiki <wikidi...@apache.org>
Subject [Cassandra Wiki] Update of "MemtableThresholds" by FlipKromer
Date Tue, 31 Aug 2010 03:51:50 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The "MemtableThresholds" page has been changed by FlipKromer.
http://wiki.apache.org/cassandra/MemtableThresholds?action=diff&rev1=18&rev2=19

--------------------------------------------------

  <<TableOfContents>>
  
  == Don't Touch that Dial ==
- The settings described here should only be changed in the face of a quantifiable performance
problem. They will affect the cluster quite differently for distinct use cases and workloads,
and the defaults were well-chosen.
+ The settings described here should only be changed in the face of a quantifiable performance
problem. They will affect the cluster quite differently for distinct use cases and workloads,
and the defaults, though conservative, were well-chosen.
  
  == JVM Heap Size ==
  By default, the cassandra startup scripts specifies a maximum JVM heap of -Xmx1G. Consider
increasing this -- but gently! If Cassandra and other processes take up too much of the available
ram, they'll force out the operating system's file buffers and caches. These are as important
as the internal data structures for ensuring Cassandra performance.
@@ -45, +45 @@

  
  ''Note: in version 0.7b2+, the value will be applied on a [[https://issues.apache.org/jira/browse/CASSANDRA-1007|per
column-family basis]].''
  
- 
- 
  == Using Jconsole To Optimize Thresholds ==
  Cassandra's column-family mbeans have a number of attributes that can prove invaluable in
determining optimal thresholds. One way to access this instrumentation is by using Jconsole,
a graphical monitoring and management application that ships with your JDK.
  

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