hadoop-common-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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,

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

The following page has been changed by stack:
http://wiki.apache.org/hadoop/Hbase/FAQ

------------------------------------------------------------------------------
  #
  # 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).
  

Mime
View raw message