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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5487) Generic framework for Master-coordinated tasks
Date Sat, 19 Oct 2013 14:08:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13799905#comment-13799905

Jonathan Hsieh commented on HBASE-5487:

[~saint.ack@gmail.com]  acked. 

Let's post design docs here, and move discussions comparing them to the mailing list.  

[~sershe] Let's name threads prefixed with [hbase-5487] in subject, and maybe rename subject
lines if we get into a more focused discussion that warrants it own thread (it one part gets
long), and in general reply inline.  (I found this interesting http://en.wikipedia.org/wiki/Posting_style).

I'll start by copying and pasting unresolved parts of the response-reply above to the dev
mailing list.

> Generic framework for Master-coordinated tasks
> ----------------------------------------------
>                 Key: HBASE-5487
>                 URL: https://issues.apache.org/jira/browse/HBASE-5487
>             Project: HBase
>          Issue Type: New Feature
>          Components: master, regionserver, Zookeeper
>    Affects Versions: 0.94.0
>            Reporter: Mubarak Seyed
>            Assignee: Sergey Shelukhin
>            Priority: Critical
>         Attachments: Entity management in Master - part 1.pdf, hbckMasterV2b-long.pdf,
hbckMasterV2-long.pdf, Is the FATE of Assignment Manager FATE.pdf, Region management in Master5.docx,
Region management in Master.pdf
> Need a framework to execute master-coordinated tasks in a fault-tolerant manner. 
> Master-coordinated tasks such as online-scheme change and delete-range (deleting region(s)
based on start/end key) can make use of this framework.
> The advantages of framework are
> 1. Eliminate repeated code in Master, ZooKeeper tracker and Region-server for master-coordinated
> 2. Ability to abstract the common functions across Master -> ZK and RS -> ZK
> 3. Easy to plugin new master-coordinated tasks without adding code to core components

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