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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3077) Quorum-based protocol for reading and writing edit logs
Date Wed, 14 Mar 2012 20:38:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229592#comment-13229592
] 

Todd Lipcon commented on HDFS-3077:
-----------------------------------

bq. The flip side of this though is that if a ZK issue were identified it could be fixed and
redeployed w/o requiring a re-release of Hadoop. ZK blocker issues are typically turned around
quite rapidly, while rare on the stable codeline it's usually on order of days to a week.

That's true of ZK issues. But is the same true of BK, which is marked "contrib" and isn't
deployed in production anywhere except for one org AFAIK? Looking at recent commits to the
BK tree, it's an awful lot of bug fixes relating to the indexing code that allows multiple
logs to be interleaved, etc -- issues stemming from its generality.
                
> 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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