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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/FAQ" by JeanDanielCryans
Date Mon, 18 Jan 2010 18:28:46 GMT
Dear Wiki user,

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

The "Hbase/FAQ" page has been changed by JeanDanielCryans.
The comment on this change is: added new entry for adding/removing nodes.


   1. [[#18|What version of Hadoop do I need to run HBase?]]
   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?]]
  == Answers ==
@@ -205, +206 @@

  This schema gives you fast access to the queries, show all classes for a student (student
table, courses family), or all students for a class (courses table, students family). 
+ '''21. <<Anchor(21)>> How do I add/remove a node?'''
+ Adding and removing nodes works the same way in HBase and Hadoop. To add a new node, do
the following steps:
+  1. Edit $HBASE_HOME/conf/regionservers on the Master node and add the new address.
+  2. Setup the new node with needed software, permissions.
+  3. On that node run $HBASE_HOME/bin/hbase-daemon.sh start regionserver
+  4. Confirm it worked by looking at the Master's web UI or in that region server's log.
+ Removing a node is as easy, first issue "stop" instead of start then remove the address
from the regionservers file. 
+ 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.

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