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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/FAQ" by JeffHammerbacher
Date Sun, 16 May 2010 20:28:10 GMT
Dear Wiki user,

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The "Hbase/FAQ" page has been changed by JeffHammerbacher.


   1. [[#10|Any other troubleshooting pointers for me?]]
   1. [[#20|Are there any schema design examples?]]
   1. [[#21|How do I add/remove a node?]]
+  1. [[#22|Why do servers have start codes?]]
  == Answers ==
@@ -219, +220 @@

  For Hadoop, use the same kind of script (starts with hadoop-*), their process names (datanode,
tasktracker), and edit the slaves file. Removing datanodes is tricky, please review the dfsadmin
command before doing it.
+ '''22. <<Anchor(22)>> Why do servers have start codes?'''
+ If a region server crashes and recovers, it cannot be given work until its lease times out.
If the lease is identified only by an IP address and port number, then that server can't do
any progress until the lease times out. A start code is added so that the restarted server
can begin doing work immediately upon recovery. For more, see https://issues.apache.org/jira/browse/HBASE-1156.

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