Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
HBase, mail # user - HBase MapReduce with setup function problem


Copy link to this message
-
Re: HBase MapReduce with setup function problem
Ted Yu 2014-01-27, 17:35
Have you considered using MultiTableInputFormat ?

Cheers
On Mon, Jan 27, 2014 at 9:14 AM, daidong <[EMAIL PROTECTED]> wrote:

> Dear all,
>
>   I am writing a MapReduce application processing HBase table. In each map,
> it needs to read data from another HBase table, so i use the 'setup'
> function to initialize the HTable instance like this:
>
> @Override
>
>     public void setup(Context context){
>
>       Configuration conf = HBaseConfiguration.create();
>
>       try {
>
>        centrals = new HTable(conf, "central".getBytes());
>
>       } catch (IOException e) {
>
>       }
>
>       return;
>
>     }
>
> But, when i run this mapreduce application, it is always stay in 0%,0%. And
> the map phase is always under initializing, does not progress. I have
> googled it, but still do not have any ideas.
>
> P.S. I use hadoop-1.1.2 and Hbase-0.96.
>
> Thanks!
>
> - Dong
>