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From Apache Wiki <wikidi...@apache.org>
Subject [Cassandra Wiki] Update of "Operations" by Chris Goffinet
Date Tue, 08 Dec 2009 23:47:54 GMT
Dear Wiki user,

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

The "Operations" page has been changed by Chris Goffinet.
http://wiki.apache.org/cassandra/Operations?action=diff&rev1=6&rev2=7

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  Running `nodeprobe cfstats` can provide an overview of each Column Family, and important
metrics to graph your cluster. Some folks prefer having to deal with non-jmx clients, there
is a JMX-to-REST bridge available at http://code.google.com/p/polarrose-jmx-rest-bridge/
  
- Import metrics to watch on a per-Column Family basis would be: '''Read Count, Read Latency,
Write Count and Write Latency'''. '''Pending Tasks''' tell you if things are backing up. These
metrics can also be exposed using any JMX client such as `jconsole`
+ Important metrics to watch on a per-Column Family basis would be: '''Read Count, Read Latency,
Write Count and Write Latency'''. '''Pending Tasks''' tell you if things are backing up. These
metrics can also be exposed using any JMX client such as `jconsole`
  
  For debugging purposes you can use jconsole, and the MBeans tab to look at PendingTasks
for thread pools. If you see one particular thread backing up, this can give you an indication
of a problem. One example would be ROW-MUTATION-STAGE. If you are seeing a lot of tasks being
built up, your hardware or configuration tuning is probably the bottleneck.
  

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