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From Phil Rhodes <phil.rho...@distilnetworks.com>
Subject Re: Looking for additional insight on Impala query states
Date Tue, 23 Aug 2016 18:17:37 GMT
Thanks Matt, that helps a lot.


Phil


On Mon, Aug 22, 2016 at 3:57 PM, Matthew Jacobs <mj@cloudera.com> wrote:
> Hi Phil,
>
> The main reason that queries remain registered in some form is to give
> clients the ability to query their final state. If the query were to
> disappear automatically, a client might try to fetch or get the status
> and Impala would indicate that no such query exists. Queries will not
> automatically be unregistered until they are explicitly closed by a
> client, the client closes the session, or the --idle_session_timeout
> (Impalad process argument) is set and the specified idle time elapses
> for the session, at which point every query in the session is
> unregistered.
>
> Thanks,
> Matt
>
> On Mon, Aug 22, 2016 at 11:12 AM, Phil Rhodes
> <phil.rhodes@distilnetworks.com> wrote:
>> Hi all, I've looked at https://issues.cloudera.org/browse/IMPALA-2198
>> and read the linked page, but am still not totally clear on a couple
>> of things regarding Impala query states.  Could anyone here possibly
>> speak to these two things in particular:
>>
>> 1. Why does  a query go into "waiting to be closed" state?  I mean, I
>> get that it's "an exception or it's returned all it's rows", but I
>> don't get why such a query isn't closed immediately.
>>
>> and perhaps more to the point:
>>
>> 2. Will all queries sitting in "waiting to be closed" state eventually
>> be closed by the Impala runtime? And, if so, are there any guarantees
>> about how long they may remain in this state before being closed?
>>
>>
>> Any insights you can share would be greatly appreciated.
>>
>>
>> Thanks,
>>
>>
>> Phil R.

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