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Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2009/02/23 00:08:59 UTC

[Hadoop Wiki] Trivial Update of "Hbase/FAQ" by stack

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The following page has been changed by stack:
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+ You may need to also edit sysctl.conf.
  
  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).