Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Plain View
HBase >> mail # user >> MapReduce: Reducers partitions.


Copy link to this message
-
MapReduce: Reducers partitions.
Hi,

quick question. How are the data from the map tasks partitionned for
the reducers?

If there is 1 reducer, it's easy, but if there is more, are all they
same keys garanteed to end on the same reducer? Or not necessary?  If
they are not, how can we provide a partionning function?

Thanks,

JM
+
Nitin Pawar 2013-04-10, 12:55
+
Jean-Marc Spaggiari 2013-04-10, 13:54
+
Ted Yu 2013-04-10, 13:58
+
Nitin Pawar 2013-04-10, 14:01
+
Jean-Marc Spaggiari 2013-04-10, 14:03
+
Jean-Marc Spaggiari 2013-04-10, 18:26
+
Graeme Wallace 2013-04-10, 18:52
+
Jean-Marc Spaggiari 2013-04-10, 19:01
+
Stack 2013-04-11, 00:33
+
Jean-Marc Spaggiari 2013-04-11, 11:52
+
Ted Yu 2013-04-11, 00:03
+
Graeme Wallace 2013-04-10, 19:06
+
Stack 2013-04-11, 00:26
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB