You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2009/08/12 00:00:24 UTC

[Hadoop Wiki] Update of "PerformanceTuning" by JeanDanielCryans

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.

------------------------------------------------------------------------------
   * 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 ==