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From Tomer Shiran <tshi...@gmail.com>
Subject Re: Questions on drill execution
Date Tue, 05 May 2015 02:39:55 GMT
http://drill.apache.org/docs/drill-introduction/#videos



> On May 4, 2015, at 3:10 PM, Ted Dunning <ted.dunning@gmail.com> wrote:
> 
> Is that video linked from the web site?  Looks like a really great resource.
> 
> 
> 
>> On Mon, May 4, 2015 at 6:23 PM, Hao Zhu <hzhu@maprtech.com> wrote:
>> 
>> https://www.youtube.com/watch?v=kG6vzsk8T7E
>> This presentation contains lots of details for query execution plan.
>> 
>> On Mon, May 4, 2015 at 7:10 AM, Carol McDonald <cmcdonald@maprtech.com>
>> wrote:
>> 
>>> https://cwiki.apache.org/confluence/display/DRILL/EXPLAIN+Commands
>>> 
>>>> On Mon, May 4, 2015 at 3:46 AM, George Lu <luwenbin888@gmail.com> wrote:
>>>> 
>>>> Dear all,
>>>> 
>>>> I have deployed Drill on several nodes in the cluster and experienced
>> the
>>>> query.
>>>> I have some questions:
>>>> 
>>>> 1) Can anyone show me some links to read for the Drill execution plan,
>>> how
>>>> to understand it.
>>>> 
>>>> 2) I execute some group by query on HBase several times, some time very
>>>> fast, while sometimes very slow, and even get exception, like "Query
>>>> failed: RemoteRpcException: Failure while running fragment., Command
>>> failed
>>>> while establishing connection.  Failure type CONNECTION. [
>>>> 2ba2092f-53ed-480a-9f23-f89b6e6a91a0 on test6:31010 ]
>>>> [ 2ba2092f-53ed-480a-9f23-f89b6e6a91a0 on test6:31010 ]
>>>> 
>>>> 
>>>> java.lang.RuntimeException: java.sql.SQLException: Failure while
>>> executing
>>>> query.
>>>> at sqlline.SqlLine$IncrementalRows.hasNext(SqlLine.java:2514)
>>>> at sqlline.SqlLine$TableOutputFormat.print(SqlLine.java:2148)
>>>> at sqlline.SqlLine.print(SqlLine.java:1809)
>>>> at sqlline.SqlLine$Commands.execute(SqlLine.java:3766)
>>>> at sqlline.SqlLine$Commands.sql(SqlLine.java:3663)
>>>> at sqlline.SqlLine.dispatch(SqlLine.java:889)
>>>> at sqlline.SqlLine.begin(SqlLine.java:763)
>>>> at sqlline.SqlLine.start(SqlLine.java:498)
>>>> at sqlline.SqlLine.main(SqlLine.java:460)"
>>>> 
>>>> I am not sure whether Drill uses pre-execute like in Hadoop or auto
>>> failure
>>>> detection. If some of the execution node failed, what will happen? If
>>> some
>>>> node is under high pressure for other task, and what will happen if
>> this
>>>> node becomes the one who drags the whole execution slow?
>>>> 
>>>> Thanks!
>>>> 
>>>> George
>> 

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