[jira] [Commented] (BOOKKEEPER-593) use the application machine as one of bookies for ledger write if possible

["Rakesh R (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BOOKKEEPER-593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647247#comment-13647247 ] 

Rakesh R commented on BOOKKEEPER-593:
-------------------------------------

Its an interesting topic:), basically the idea is to schedule the I/O intensive operations closer to the data. 

As I understood BOOKKEEPER-592, is talking the read I/O, which will helps application to improve the fail-over time. But BOOKKEEPER-593, is talking about the write centric data locality, here I feel the advantage we are getting with BOOKKEEPER-592 will be in tose. By seeing these two usecases, bk should allow users to set preferences/intelligence considering both these aspects? 

bq. the write might be 0-(A,B), 1-(A, C), 2-(A, B).

Here machine A would be consumed more, I'm bit worried about the storage space and requires an efficient load balancing algo. What do you say?
                
> use the application machine as one of bookies for ledger write if possible
> --------------------------------------------------------------------------
>
>                 Key: BOOKKEEPER-593
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-593
>             Project: Bookkeeper
>          Issue Type: Improvement
>            Reporter: Ming Ma
>            Assignee: Sijie Guo
>
> In the scenario where bk applications run on the same set of machines as bookies, it will be useful if bk can put one of the ledger replica on the same machine as the application. In that way one of the ledger writes will be local and could improve the performance.

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