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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5487) Generic framework for Master-coordinated tasks
Date Thu, 11 Jul 2013 23:59:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706491#comment-13706491
] 

stack commented on HBASE-5487:
------------------------------

Was just looking at a test failure issue.   A move operation was failing because the region
we were asking it to move had not fully opened yet so move just failed:

2013-07-11 09:35:00,489 DEBUG [RpcServer.handler=4,port=55346] master.AssignmentManager(2277):
Attempting to unassign ephemeral,,1373535299969.ab63d8b7c5339b4a61fdd70e8cb8993a. but it is
already in transition (OPEN, force=false)

Client needs means of asking what happened to its move.

Client should also be able to say I want the move to succeed..... in the above case then,
the move op should be retried.

Need a queue of outstanding ops.  Need to be able to query it for where is my op? (like fedex
where is my package)
                
> 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
>         Attachments: 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
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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