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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/Troubleshooting" by AndrewPurtell
Date Fri, 16 Oct 2009 01:34:24 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:

   1. [[#10|Problem: Scanners keep getting timeouts]]
   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. Problem: Master initializes, but Region Servers do not ==
@@ -194, +195 @@

  === Resolution ===
   * Use the hostname presented in the error message instead of the value you used. If you
have a DNS server, you can set '''hbase.zookeeper.dns.interface''' and '''hbase.zookeeper.dns.nameserver'''
in hbase-site.xml to make sure it resolves to the correct FQDN.
+ <<Anchor(13)>>
+ == 13. Problem: Long client pauses under high load; or deadlock if using THBase ==
+  * Under high load, some client operations take a long time; waiting appears uneven
+  * If using transactional HBase (THBase), apparent deadlocks: for example, in thread dumps
IPC Server handlers are blocked in org.apache.hadoop.hbase.regionserver.tableindexed.IndexedRegion.updateIndex()
+ == Causes ==
+  * The default number of regionserver RPC handlers is insufficient.
+ == Resolution ==
+  * Increase the value of "hbase.regionserver.handler.count" in hbase-site.xml. The default
is 10. Try 100.

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