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From Chris Nauroth <cnaur...@hortonworks.com>
Subject Re: A question about high availability of NameNode
Date Mon, 11 Nov 2013 16:59:52 GMT

For more background, I recommend reviewing the documentation on HDFS HA
with Quorum Journal Manager, particularly the Architecture section:


To summarize, edit logs are replicated, but it happens via interaction with
a separate set of daemons called the journal nodes.  The active persists
its edit logs to a majority of journal nodes (deployed in multiple).  The
standby reads the edits from the journal nodes and applies them locally.

The separate journal nodes provide redundancy, so that edits don't need to
be blocked if a single node dies.  By continuously reading the edits, the
standby can stay up to date with changes applied at the active and failover
quickly if needed.

Chris Nauroth

On Sat, Nov 9, 2013 at 7:29 PM, origin <fulin139@qq.com> wrote:

> Hey guys:
>     I was curious that why Active NameNode do not repilcation edits log to
> Standby NameNode like MySQL dose?

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