Zoltan Haindrich commented on HIVE-14285:

sorry; I've misunderstood...yes they are executed in parallel; and I think 
there is an option to even execute tasks in parallel(EXECPARALLEL ; but it 
seems thats probably mr related)

afaik: the vertices which are independent may run in parallel (not just map 
phases) - as long as the dag dependencies are satisifed 

>  Explain outputs: map-entry ordering of non-primitive objects. 
> ---------------------------------------------------------------
>                 Key: HIVE-14285
>                 URL: https://issues.apache.org/jira/browse/HIVE-14285
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Minor
>             Fix For: 2.3.0
>         Attachments: HIVE-14285.1.patch
> In HIVE-12244 I've left behind some ugly backward compatible getters with 
> {{@Explain}} decorations to keep the qtests from breaking.
> There were heavy explain plan changes when I used {{Path}} objects as keys in 
> {{@Explain}} marked methods.
> I've looked into the causes of this:
>  * there is a {{TreeSet}} in there to keep all the keys in order.
>  * but: {{org.apache.hadoop.fs.Path}} uses a different sort order (inherited 
> from {{java.net.URI}} )...it sorts the paths using 
> priorities:[schema,schemeSpecificPart,host,path,query,fragment]
>   considering that the output is an explain result(possibly read by humans): 
> i don't think this sophisticated sort order can be useful.
> {{ExplainTask#outputMap}} always calls toString() on the keys before using 
> them...so the most painless solution would be to change all the keys inside 
> the treeset to simple strings (in case it's not a primitive already); this 
> would restore the original behaviour for me.

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