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From Sujee Maniyam <su...@sujee.net>
Subject Re: need some help understanding NN quorum edit log
Date Wed, 24 Oct 2012 23:58:26 GMT
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

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