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From Thejas Nair <the...@hortonworks.com>
Subject Re: MapReduce with HCatalog hangs
Date Sat, 03 May 2014 01:37:39 GMT
HcatInputFormat does not run any initial mapreduce jobs. It seems to
me that the MapReduce job actually ran.
You might want to do a jstack on your java program client side, to see
what it is waiting on.


On Fri, May 2, 2014 at 7:28 AM, Fabian Reinartz
<fab.ekliv@googlemail.com> wrote:
> I implemented a MapReduce job with HCatalog as input and output. It's pretty
> much the same as the example on the website.
>
> If I start my job with `hadoop jar` an initial MapReduce is performed
> (which, I guess is the query for the HCatalog data as the setup method in my
> mapper is not executed). After that MapReduce no further output happens (for
> hours, so pretty sure it hangs).
>
> The output of that initial MapReduce contains:
>
>         Map-Reduce Framework
>                 Map input records=23700
>                 Map output records=0
>
>
> So apparently all records of my data are read (but not passed on after
> that?).
> Any ideas what the problem could be?
>
> The input schema for the job is correct, the records are initially read but
> my mapper is never executed.
>
> I'm using Hadoop 2.4 and Hive 0.13.

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