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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/Troubleshooting" by AndrewPurtell
Date Sat, 03 Jan 2009 19:35:32 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 AndrewPurtell:
http://wiki.apache.org/hadoop/Hbase/Troubleshooting

The comment on the change is:
Add note about dfs.datanode.handler.count.

------------------------------------------------------------------------------
   * Slow datanodes are marked as down by DFSClient; eventually all replicas are marked as
'bad' (HADOOP-3831).
  === Resolution ===
   * Try setting '''dfs.datanode.socket.write.timeout''' to zero.  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 $HBASE_HOME/conf/hbase-site.xml.
+  * 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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