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https://issues.apache.org/jira/browse/HDFS-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229583#comment-13229583
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Patrick Hunt commented on HDFS-3077:
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bq. If there is a bug discovered in this code, we can fix it with a new Hadoop
release without having to wait on a new release of ZooKeeper. Since ZK and HDFS
may be managed by different ops teams, this also simplifies upgrade.
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.
My experience at large companies running ZK is that they typically have special
purpose installations of ZK to support things such as this. There would be no
splitting of ops responsibilities.
> 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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