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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "DiskSetup" by SteveLoughran
Date Tue, 30 Mar 2010 10:41:03 GMT
Dear Wiki user,

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

The "DiskSetup" page has been changed by SteveLoughran.
http://wiki.apache.org/hadoop/DiskSetup?action=diff&rev1=6&rev2=7

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  === Logging ===
  
+  * The environment variable, `HADOOP_LOG_DIR` sets the directory Hadoop logs to.
+  * the log4j.properties file in your hadoop configuration dir controls logging in more detail
   * Don't log to the root directory, as having a machine that does not boot because the logs
are overflowing can be inconvenient.
   * Have a plan to clean up log output, otherwise jobs that log too much to the console will
fill up log directories.
   * Get your developers to use the commons-logging APIs in their MapReduce code, so that
you can turn logging up or down without recompiling the code. They can run in debug mode on
their test machines, you can run at WARN level in production.

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