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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Sun, 16 May 2010 20:28:10 -0000
Message-ID: <20100516202810.16909.52838@eos.apache.org>
Subject: 
 =?utf-8?q?=5BHadoop_Wiki=5D_Update_of_=22Hbase/FAQ=22_by_JeffHammerbacher?=

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for ch=
ange notification.

The "Hbase/FAQ" page has been changed by JeffHammerbacher.
http://wiki.apache.org/hadoop/Hbase/FAQ?action=3Ddiff&rev1=3D60&rev2=3D61

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

   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?]]
  =

  =3D=3D Answers =3D=3D
  =

@@ -219, +220 @@

  =

  For Hadoop, use the same kind of script (starts with hadoop-*), their pro=
cess names (datanode, tasktracker), and edit the slaves file. Removing data=
nodes 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 it=
s lease times out. If the lease is identified only by an IP address and por=
t 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 im=
mediately upon recovery. For more, see https://issues.apache.org/jira/brows=
e/HBASE-1156.
+=20