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https://issues.apache.org/jira/browse/HBASE-5487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13849798#comment-13849798
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Sergey Shelukhin commented on HBASE-5487:
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There are other justifications... my point is that having a lock over
distributed, lengthy operations on tables, esp. with region-level component
blocking table-level ops also, is the king of all epic locks, and can cause
lots of problems, esp. in large clusters. Snapshot is just one example.
> 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, Entity
> management in Master - part 1.pdf, Is the FATE of Assignment Manager
> FATE.pdf, Region management in Master.pdf, Region management in Master5.docx,
> hbckMasterV2-long.pdf, hbckMasterV2b-long.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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