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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "PerformanceTuning" by JeanDanielCryans
Date Tue, 11 Aug 2009 22:00:24 GMT
Dear Wiki user,

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

The following page has been changed by JeanDanielCryans:
http://wiki.apache.org/hadoop/PerformanceTuning

The comment on the change is:
added a tip I already sent to the mailing list.

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   * Make sure that the command {{{java}}} implies {{{-server}}} on your machines, or else
you will have to explicitly enable it.
   * Are you swapping?  JVMs hate swapping.  Adjusting [http://www.sollers.ca/blog/2008/swappiness/
swappiness] may help.
   * By default, each regionserver puts up 10 listeners only.  Up it if you have measurable
traffic (See hbase.regionserver.handler.count in hbase-default.xml).
+  * To speed up the inserts in a non critical job (like an import job), you can use Put.writeToWAL(false)
to bypass writing to the write ahead log.
  
  == HBase JVM and GC ==
  

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