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HDFS >> mail # dev >> need some help understanding NN quorum edit log

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Re: need some help understanding NN quorum edit log
Hi Sujee,

QuorumJournalManager implements the JournalManager interface. The javadoc
on JournalManager may help you understand. Also, I would recommend
understanding the local-disk implementation (FileJournalManager) before
digging too deep into the QuorumJournalManager, which is a bit more complex.


On Tue, Oct 23, 2012 at 3:31 PM, Sujee Maniyam <[EMAIL PROTECTED]> wrote:

> Hi devs,
> I am reading through the HA code, trying to understand how the
> editlogs propagate.
> I have looked at the following classes
> EditLogTailer
> JournalNode
> QuorumJournalManager
> NameNode
> FSNameSystem
> I see FSNameSystem is using FSImage editlog.   where is the tie-in
> between  NN and  QuorumJournal?
> thanks
> Sujee Maniyam
> http://sujee.net

Todd Lipcon
Software Engineer, Cloudera