http://drill.apache.org/docs/drill-introduction/#videos
> On May 4, 2015, at 3:10 PM, Ted Dunning <[email protected]> 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 <[email protected]> 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 <[email protected]> >> wrote: >> >>> https://cwiki.apache.org/confluence/display/DRILL/EXPLAIN+Commands >>> >>>> On Mon, May 4, 2015 at 3:46 AM, George Lu <[email protected]> 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 >>
