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https://issues.apache.org/jira/browse/HDFS-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230513#comment-13230513
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Todd Lipcon commented on HDFS-3077:
-----------------------------------
Hey Andrew, thanks for the ops perspective.
The idea of embedding these logger daemons inside others is definitely
something I'm considering. Embedding in DNs is one idea -- the other direction
is to actually have a quorum of NNs, so that when an edit is logged, it is also
applied to the SBN's namespace. But for simplicity on a first cut, I think the
plan is to go with external processes and then figure out where best to embed
them.
> 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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