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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/Troubleshooting" by AndrewPurtell
Date Tue, 15 Dec 2009 18:25:14 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.
http://wiki.apache.org/hadoop/Hbase/Troubleshooting?action=diff&rev1=33&rev2=34

--------------------------------------------------

   1. [[#14|Problem: Zookeeper does not seem to work on Amazon EC2]]
   1. [[#15|Problem: General operating environment issues -- zookeeper session timeouts, regionservers
shutting down, etc.]]
   1. [[#16|Problem: Scanner performance is low]]
+  1. [[#17|Problem: My shell or client application throws lots of scary exceptions during
normal operation]]
  
  <<Anchor(1)>>
  == 1. Problem: Master initializes, but Region Servers do not ==
@@ -228, +229 @@

  == Causes ==
   Various.
  == Resolution ==
-  * See the [[http://wiki.apache.org/hadoop/ZooKeeper/Troubleshooting ZooKeeper Operating
Environment Troubleshooting]] page.  It has suggestions and tools for checking disk and networking
performance; i.e. the operating environment your zookeeper and hbase are running in.  ZooKeeper
is the cluster's "canary".  It'll be the first to notice issues if any so making sure its
happy is the short-cut to a humming cluster.
+ See the [[http://wiki.apache.org/hadoop/ZooKeeper/Troubleshooting ZooKeeper Operating Environment
Troubleshooting]] page.  It has suggestions and tools for checking disk and networking performance;
i.e. the operating environment your zookeeper and hbase are running in.  ZooKeeper is the
cluster's "canary".  It'll be the first to notice issues if any so making sure its happy is
the short-cut to a humming cluster.
  
  <<Anchor(16)>>
  == 16. Problem: Scanner performance is low ==
@@ -238, +239 @@

   * Increase the amount of prefetching on the scanner, to 10, or 100, or 1000, as appropriate
for your workload: [[http://hadoop.apache.org/hbase/docs/current/api/org/apache/hadoop/hbase/client/HTable.html#scannerCaching|HTable.scannerCaching]]
   * This change can be accomplished globally by setting the hbase.client.scanner.caching
property in hbase-site.xml to the desired value.
  
+ <<Anchor(17)>>
+ == 17. Problem: My shell or client application throws lots of scary exceptions during normal
operation ==
+ == Causes ==
+ Since 0.20.0 the default log level for org.apache.hadoop.hbase.* is DEBUG.
+ == Resolution ==
+ On your clients, edit $HBASE_HOME/conf/log4j.properties and change this: {{{log4j.logger.org.apache.hadoop.hbase=DEBUG}}}
+ to this: {{{log4j.logger.org.apache.hadoop.hbase=INFO}}}, or even {{{log4j.logger.org.apache.hadoop.hbase=WARN}}}
.
+ 

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