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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TAJO-88) Implement Standby Mode (Umbrella)
Date Mon, 22 Jul 2013 15:28:48 GMT

     [ https://issues.apache.org/jira/browse/TAJO-88?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Hyunsik Choi updated TAJO-88:

    Summary: Implement Standby Mode (Umbrella)  (was: Separate Tajo's cluster resource manager
from Yarn (Umbrella))
> Implement Standby Mode (Umbrella)
> ---------------------------------
>                 Key: TAJO-88
>                 URL: https://issues.apache.org/jira/browse/TAJO-88
>             Project: Tajo
>          Issue Type: Improvement
>          Components: master, worker
>            Reporter: Hyunsik Choi
>             Fix For: 0.2-incubating
> In the current implementation, the resource management of Tajo is tightly coupled to
Hadoop Yarn. Hadoop YARN has emerged and a nice resource manager for large clusters, but Yarn
is not the best choice for low latency query executions.
> The main purpose of this issue is to add a standby mode. In this mode, Tajo workers will
be on standby, and they will provide low-latency responses for query tasks.
> This issue is an umbrella issue, and our subtasks are as follows:
> * We will separate QueryMaster from TajoMaster.
> * We will provide a resource manager interface for Yarn and Tajo's one.
> * We will implement our own resource manager and worker containers for the standby mode.
> Finally, we will provide two modes:
>  (1) On-demand mode (using Yarn): in this mode,  Tajo shares the cluster resource with
another Yarn applications. Per query, Tajo will request necessary cluster resources.
>  (2) Standby mode: in this mode, Tajo master and workers will be on standby.

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