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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/Troubleshooting" by AndrewPurtell
Date Thu, 07 Jan 2010 20:55:52 GMT
Dear Wiki user,

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

The "Hbase/Troubleshooting" page has been changed by AndrewPurtell.


  fs.file-max = 32768
- Run {{{sysctl -p /etc/sysctl.conf}}} make the change immediately effective.
+   Run the commands {{{sysctl -p /etc/sysctl.conf}}} and {{{service network restart}}} to
make the change immediately effective.
   * Apply HDFS-127 (formerly HADOOP-4681) to your cluster or at least to the hadoop jar used
by hbase.
   * Try setting '''dfs.datanode.socket.write.timeout''' to zero (in hadoop 0.18.x -- See
HADOOP-3831 for detail and why not needed in hadoop 0.19.x).  See the thread at [[http://mail-archives.apache.org/mod_mbox/hadoop-hbase-user/200810.mbox/%3C20126171.post@talk.nabble.com%3E|message
from jean-adrien]] for some background.  Note, this is an hdfs client configuration so needs
to be available in $HBASE_HOME/conf.  Making the change only in $HADOOP_HOME/conf is not sufficient.
 Copy your amended hadoop-site.xml to the hbase conf directory or add this configuration to
   * Try increasing '''dfs.datanode.handler.count''' from its default of 3. This is a server
configuration change so must be made in $HADOOP_HOME/conf/hadoop-site.xml. Try increasing
it to 10, then by additional increments of 10. It probably does not make sense to use a value
larger than the total number of nodes in the cluster. 

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