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Posted to common-dev@hadoop.apache.org by "Jie Qiu (JIRA)" <ji...@apache.org> on 2009/06/30 12:05:47 UTC

[jira] Created: (HADOOP-6121) High Availability support for Hadoop

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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