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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "NameNode" by GridEngine
Date Sat, 10 Sep 2011 05:08:49 GMT
Dear Wiki user,

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

The "NameNode" page has been changed by GridEngine:
http://wiki.apache.org/hadoop/NameNode?action=diff&rev1=8&rev2=9

Comment:
be specific

  It is essential to look after the NameNode. Here are some recommendations from production
use
  
   * Use a good server with lots of RAM. The more RAM you have, the bigger the file system,
or the smaller the block size.
-  * Use ECC RAM. 
+  * Use ECC RAM.
-  * On Java6u15 or later, run the server VM with compressed pointers {{{-XX:+UseCompressedOops}}}
to cut your heap size down.
+  * On Java6u15 or later, run the server VM with compressed pointers {{{-XX:+UseCompressedOops}}}
to cut the JVM heap size down.
   * List more than one name node directory in the configuration, so that multiple copies
of the file system meta-data will be stored. As long as the directories are on separate disks,
a single disk failure will not corrupt the meta-data.
   * Configure the NameNode to store one set of transaction logs on a separate disk from the
image.
   * Configure the NameNode to store another set of transaction logs to a network mounted
disk.

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