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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3077) Quorum-based protocol for reading and writing edit logs
Date Mon, 12 Mar 2012 18:44:39 GMT
Quorum-based protocol for reading and writing edit logs

                 Key: HDFS-3077
                 URL: https://issues.apache.org/jira/browse/HDFS-3077
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: ha, name-node
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon

Currently, one of the weak points of the HA design is that it relies on shared storage such
as an NFS filer for the shared edit log. One alternative that has been proposed is to depend
on BookKeeper, a ZooKeeper subproject which provides a highly available replicated edit log
on commodity hardware. This JIRA is to implement another alternative, based on a quorum commit
protocol, integrated more tightly in HDFS and with the requirements driven only by HDFS's
needs rather than more generic use cases. More details to follow.

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