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From "Jie Qiu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6121) High Availability support for Hadoop
Date Tue, 30 Jun 2009 10:05:47 GMT
High Availability support for Hadoop
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                 Key: HADOOP-6121
                 URL: https://issues.apache.org/jira/browse/HADOOP-6121
             Project: Hadoop Common
          Issue Type: New Feature
          Components: dfs, mapred
            Reporter: Jie Qiu


Currently, We look at the HA of Hadoop cluster. We need to consider the NameNode HA as well
as Jobtracker HA. For NameNode, we want to build primary/standy or master-slaves pattern to
provide NameNode HA. Therefore, we need to consider how to ship log between primary/standby/slaves
and how commit "write" operation to NameNode after the agreement among primary/standby/slaves
on log. Whether will we use Linux HA package or NameNode-built-in HA package without the help
of outter Linux HA package. 
After NameNode become high availability, is it necessary to provide HA for Jobtracker? Can
Jobtracker  persist the states of Jobs and tasks into HA NameNode? Or Jobtracker also needs
the same approach from NameNode for HA support.

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