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https://issues.apache.org/jira/browse/TAJO-1228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyunsik Choi updated TAJO-1228:
-------------------------------
Attachment: TAJO-1228_4.patch
> TajoClient should communicate with only TajoMaster without TajoWorker
> ---------------------------------------------------------------------
>
> Key: TAJO-1228
> URL: https://issues.apache.org/jira/browse/TAJO-1228
> Project: Tajo
> Issue Type: Bug
> Components: client
> Reporter: Hyunsik Choi
> Assignee: Hyunsik Choi
> Fix For: 0.10
>
> Attachments: TAJO-1228.patch, TAJO-1228_2.patch, TAJO-1228_3.patch,
> TAJO-1228_4.patch
>
>
> Currently, TajoClient connects with TajoMaster as well as TajoWorker. A query
> submission is passed from TajoClient to TajoMaster, and than TajoMaster
> forwards the query to one query master running on a TajoWorker. After than, a
> client monitors the query progress through the query master.
> In other words, TajoClient contacts both TajoMaster and TajoWorker. It has
> three disadvantages:
> * a network firewall should allow connections to TajoWorker nodes.
> * all components should have complex states and communication logic one
> another.
> * TAJO-1160 is trying to remove hadoop dependency from TajoClient. In
> TAJO-1160, TajoClient will use only some server which forwards query results
> to itself instead of reading directly HDFS. TajoMaster would be the best
> component to forward the query results because TajoClient always connects
> with TajoMaster. So, if TajoClient communicates with only TajoMaster, all
> client logic and protocol would be simple.
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