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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2013/07/12 01:59:50 UTC
[jira] [Commented] (HBASE-5487) Generic framework for
Master-coordinated tasks
[ 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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