-Re: current direction in namenode HA
Aaron T. Myers 2012-09-04, 22:55
On Tue, Sep 4, 2012 at 3:37 PM, Sujee Maniyam <[EMAIL PROTECTED]> wrote:
> I am trying to understand the current state / direction of namenode
> HA implementation.
Thanks for the interest.
> For using shared directory, I see the following options
> and https://issues.apache.org/jira/browse/HDFS-3278)
> 1) rely on external HA filer
This is currently committed / released.
> 2) multiple edit directories
This was an option that was considered (and mentioned in the blog post you
referenced) but I don't know of anyone actively working on this.
> 3) book keeper
This is being actively developed. There's not an umbrella JIRA or label
that I'm aware of which tracks this work, but if you search the HDFS JIRA
for "bookkeeper" or "bkjm" (Bookkeeper journal manager) you should find
> 4) keep edits in HDFS / quorum based
This is also being actively developed. See this JIRA for more info:
> is there going to be an 'official / supported' method, or it is going
> to be a configurable choice when setting up a cluster?
At least for the time being, only option 1 is released. Options 3 and 4
will likely be completed / released soon, and once that happens all of
these will be mutually-exclusive options in HDFS. Each of these approaches
will coexist as a different option that can be configured when setting up
an HA HDFS cluster.
I hope that clears things up.
Aaron T. Myers
Software Engineer, Cloudera