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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/FAQ" by stack
Date Tue, 02 Sep 2008 18:14:23 GMT
Dear Wiki user,

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The following page has been changed by stack:

  # domain    type    item    value
- hbase     hard    nofile  32768}}}
+ hbase     -    nofile  32768}}}
  The math runs roughly as follows: Per column family, there is at least one mapfile and possibly
up to 5 or 6 if a region is under load (lets say 3 per column family on average).  Multiply
by the number of regions per region server.  So, for example, say you have a schema of 3 column
familes per region and that you have 100 regions per regionserver, the JVM will open 3 * 3
* 100 mapfiles -- 900 file descriptors not counting open jar files, conf files, etc (Run 'lsof
-p REGIONSERVER_PID' to see for sure).

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