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https://issues.apache.org/jira/browse/TAJO-602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13902933#comment-13902933
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Min Zhou commented on TAJO-602:
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Sure. Thanks, Hyunsik!
> WorkerResourceManager should be broke down into 3 parts
> --------------------------------------------------------
>
> Key: TAJO-602
> URL: https://issues.apache.org/jira/browse/TAJO-602
> Project: Tajo
> Issue Type: Sub-task
> Reporter: Min Zhou
>
> Before implementing a scheduler, I think we should do some refactoring at
> first. There are 2 interfaces and 4 classes related to resource management,
> they are WorkerResourceManager , YarnTajoResourceManager,
> TajoWorkerResourceManager reside in TajoMaster, and ResourceAllocator,
> YarnResourceAllocator, TajoResourceAllocator reside in QueryMasters.
> WorkerResourceManager actually plays 3 roles
> 1. Choose or start a QueryMaster for a query, and management it
> 2. allocate resource for query tasks / task runners (only for standalone mode)
> 3. Handle worker's heartbeat (only for standalone mode)
> If the scheduler is a decentralized one, like sparrow, we can allocate
> resource for a QueryMaster as the same way for a TaskRunner. So 1. and 2.
> can use the same interface, but called by 2 different caller. 3. is
> different from the others, we can create another service, let's say
> HeartbeatService to deal with worker's heartbeats.
> Any suggestion?
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