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From Alan Gates <ga...@hortonworks.com>
Subject Re: relationship between a hive query and a tez dag
Date Thu, 18 Dec 2014 00:04:30 GMT
DDL operations are done from the client, not as part of a Tez DAG.  
There still is no linkage between the DAGs even if they access the same 
tables or somehow depend on each other.  Hive manages making sure 
queries are executed in the order given.  Tez just executed each query.

Alan.

> Xiaoyong Zhu <mailto:xiaoyzhu@microsoft.com>
> December 16, 2014 at 15:41
>
> Thanks Alan! Then what if different hive queries have some links (e.g. 
> query 1 creates table abc and query 2 reads data from abc) will this 
> be in 1 DAG or 2 DAGs? If 2, then is there any link/relatioinship 
> between the 2 DAGs?
>
> Xiaoyong
>
> *From:*Alan Gates [mailto:gates@hortonworks.com]
> *Sent:* Wednesday, December 17, 2014 5:27 AM
> *To:* user@hive.apache.org
> *Subject:* Re: relationship between a hive query and a tez dag
>
> Several.  Each Hive query becomes one Tez DAG.
>
> Alan.
>
>
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> Alan Gates <mailto:gates@hortonworks.com>
> December 16, 2014 at 13:26
> Several.  Each Hive query becomes one Tez DAG.
>
> Alan.
>
>

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