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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/Troubleshooting" by stack
Date Mon, 30 Nov 2009 20:39:00 GMT
Dear Wiki user,

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The "Hbase/Troubleshooting" page has been changed by stack.
http://wiki.apache.org/hadoop/Hbase/Troubleshooting?action=diff&rev1=30&rev2=31

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

   1. [[#12|Problem: Could not find my address: xyz in list of ZooKeeper quorum servers]]
   1. [[#13|Problem: Long client pauses under high load; or deadlock if using THBase]]
   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.]]
  
  <<Anchor(1)>>
  == 1. Problem: Master initializes, but Region Servers do not ==
@@ -205, +206 @@

  == Resolution ==
   * Increase the value of "hbase.regionserver.handler.count" in hbase-site.xml. The default
is 10. Try 100.
  
- <<Anchor(13)>>
+ <<Anchor(14)>>
- == 13. Problem: Zookeeper does not seem to work on Amazon EC2 ==
+ == 14. Problem: Zookeeper does not seem to work on Amazon EC2 ==
   * HBase does not start when deployed as Amazon EC2 instances.
   * Exceptions like the below appear in the master and/or region server logs:
  {{{
@@ -221, +222 @@

  == Resolution ==
   * Use the internal EC2 host names when configuring the Zookeeper quorum peer list. 
  
+ <<Anchor(15)>>
+ == 15. Problem: General operating environment issues -- zookeeper session timeouts, regionservers
shutting down, etc ==
+ == 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.
+ 

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