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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/Troubleshooting" by AndrewPurtell
Date Tue, 08 Dec 2009 22:59:39 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=32&rev2=33

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  == Causes ==
  Default scanner caching (prefetching) is set to 1. The default is low because if a job takes
too long processing, a scanner can time out, which causes unhappy jobs/people/emails. See
item #10 above.
  == Resolution ==
+  * 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]]
-  * 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/r0.20.2/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.
  

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