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From Todd Lipcon <t...@cloudera.com>
Subject Re: need some help understanding NN quorum edit log
Date Thu, 25 Oct 2012 00:55:00 GMT
Yep, that's right.

-Todd

On Wed, Oct 24, 2012 at 4:58 PM, Sujee Maniyam <sujee@sujee.net> wrote:

> Hi Todd,
> thanks!
>
> So
> FSEditLog.java ::  createJournal(URI uri)
> is where a specific journal is chosen.
> Config parameters are : dfs.namenode.shared.edits.dir  and
> dfs.namenode.edits.journal-plugin
>
> correct?
>
> regards
> Sujee
>
> http://sujee.net
>
>
> On Tue, Oct 23, 2012 at 4:49 PM, Todd Lipcon <todd@cloudera.com> wrote:
> > 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.
> >
> > -Todd
> >
> > On Tue, Oct 23, 2012 at 3:31 PM, Sujee Maniyam <sujee@sujee.net> 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
>



-- 
Todd Lipcon
Software Engineer, Cloudera

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