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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5487) Generic framework for Master-coordinated tasks
Date Sat, 12 Jan 2013 01:11:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551719#comment-13551719
] 

Enis Soztutar commented on HBASE-5487:
--------------------------------------

One more benefit for going WAL can be that you can replicate master operations (if you want
to) to remote cluster. I am checking the HLog infrastructure right now, it does not look too
intrusive to add an hlog for the master. Of course there would be some work for log splitting
(or lack thereof), replaying, rolling, and serializing the operation steps as WALEdits. 
                
> 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: Nick Dimiduk
>
> 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
tasks
> 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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