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From "Yonghwan Kim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4945) A Distributed and Cooperative NameNode Cluster for a Highly-Available HDFS
Date Sun, 30 Jun 2013 05:32:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13696278#comment-13696278
] 

Yonghwan Kim commented on HDFS-4945:
------------------------------------

Dear Suresh Srinivas,

Thank you for your helpful comments.

1. As you said, in the case of HDFS 2.0, an NFS is necessary to share edit logs between 2
NNs.
However, we simple thought an NFS can be a new SPOF, so some way to guarantee the fault-tolerance
of an NFS should be needed (i.e. RAID or network multiplexing). We just express it(fault-tolerant
technique) in a word 'reliable sophisticated storage'.
Actually, latest version of HDFS 2.0(maybe 2.0.5) adopts QJM(HDFS-3077), and one of its requirements
is "No requirement for special hardware". Likewise, we want to propose a new architecture
using only commodity hardwares.

2&3. I deeply apologize for absence of detail information. I'm writing a technical document
(paper) (including background, related works, design, proof of consistency) but not completed
yet. Please wait for a while and I'll add some information here before complete the writing
our paper.

4. We just had tested the system's overhead for synchronizing among NNs with some dummy data.
After the completion of writing document, we will implement a prototype with utmost effort.
(We already had proved that our system is consistent in theory)


Affects Version is my mistake. I'll edit it to HDFS-1623. Thanks.

Sorry for my poor English.

                
> A Distributed and Cooperative NameNode Cluster for a Highly-Available HDFS
> --------------------------------------------------------------------------
>
>                 Key: HDFS-4945
>                 URL: https://issues.apache.org/jira/browse/HDFS-4945
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: auto-failover
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Yonghwan Kim
>              Labels: documentation
>
> See the following comment for detailed description.

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