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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/Troubleshooting" by AndrewPurtell
Date Tue, 20 Oct 2009 09:02:13 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=29&rev2=30

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

   1. [[#11|Problem: Client says no such table but it exists]]
   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]]
  
  <<Anchor(1)>>
  == 1. Problem: Master initializes, but Region Servers do not ==
@@ -204, +205 @@

  == Resolution ==
   * Increase the value of "hbase.regionserver.handler.count" in hbase-site.xml. The default
is 10. Try 100.
  
+ <<Anchor(13)>>
+ == 13. 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:
+ {{{
+   2009-10-19 11:52:27,030 INFO org.apache.zookeeper.ClientCnxn: Attempting
+   connection to server ec2-174-129-15-236.compute-1.amazonaws.com/10.244.9.171:2181
+   2009-10-19 11:52:27,032 WARN org.apache.zookeeper.ClientCnxn: Exception
+   closing session 0x0 to sun.nio.ch.SelectionKeyImpl@656dc861
+   java.net.ConnectException: Connection refused
+ }}}
+ == Causes ==
+  * Security group policy is blocking the Zookeeper port on a public address.
+ == Resolution ==
+  * Use the internal EC2 host names when configuring the Zookeeper quorum peer list. 
+ 

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