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From Uma Maheswara Rao G <mahesw...@huawei.com>
Subject [Updated] RE: current direction in namenode HA
Date Wed, 05 Sep 2012 04:56:32 GMT
My previous reply messed up the options numbering, It may confuse some people. I am resending
it again by correcting that. Appologies for confusions.

>>>1) rely on external HA filer
    If you can invest on NFS filers, it is one option in HA.  If you want to try this, you
can use released Hadoop-2 version and try. but below #3 and #4 will avoid this external hardware
>>>2) multiple edit directories
    HDFS already supports, multiple edit directory configuration. I am not exactly sure what
option you are referring here.

>>>3) book keeper
   Please take a look at https://issues.apache.org/jira/browse/HDFS-3399
  We are testing with BookeKeeper from last 2/3 months and going well. BK is progressing on
autorecovery and security  parts. Almost auto recoverry done (BOOKKEEPER-237) and will be
released in BK 4.2 version very soon. BK already started work on security part as well. Also
this integration part will come out with next hadoop-2 release as well. Also attached tested
scenarios in HDFS-3399 for your reference if you want to take a look. Also there is one subTask
in that umbrella  JIRA for user manual  information. BookKeeper Wiki https://cwiki.apache.org/confluence/display/BOOKKEEPER/BookKeeper

>>>4) keep edits in HDFS / quorum based
    you can take a look at HDFS-3077. In this umbrella JIRA, work is going actively.
    https://issues.apache.org/jira/browse/HDFS-3077 you can get more design details in that


From: Sujee Maniyam [sujee@sujee.net]
Sent: Wednesday, September 05, 2012 4:07 AM
To: hdfs-dev@hadoop.apache.org
Subject: current direction in namenode HA

Hello devs,

I am trying to understand the current state / direction of  namenode
HA implementation.

For using shared directory, I see the following options
(from http://www.cloudera.com/blog/2012/03/high-availability-for-the-hadoop-distributed-file-system-hdfs/
  and  https://issues.apache.org/jira/browse/HDFS-3278)

1) rely on external HA filer
2) multiple edit directories
3) book keeper
4) keep edits in HDFS / quorum based

is there going to be an 'official / supported' method, or it is going
to be a configurable choice when setting up a cluster?

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