https://community.cloudera.com/t5/Archives-of-Support-Questions/MapReduce-performance-on-the-HBase-input-table/m-p/163414#M45220 <P>TableInputFormat used in HBase will create 1 map task per table region. The data size will depend on how big your regions are. </P> Fri, 04 Nov 2016 00:56:32 GMT Enis 2016-11-04T00:56:32Z https://community.cloudera.com/t5/Archives-of-Support-Questions/MapReduce-performance-on-the-HBase-input-table/m-p/163413#M45219 <P>While running a MR on the HDFS file, The # of mappers is based on the input split size. While it is usually true that the input split size will match the block size with a text input file in hdfs. ( understand not always the case but most of the time)</P><P>What will happen when I run a MR on the hbase table as a input record. How does the input split size match with the hbase table and how can I control the number of mapper while running MR on top of the HBase table. Can someone guide me here. Using hbase 0.98.4 and hdoop 2.6 version.</P> Thu, 03 Nov 2016 19:48:17 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/MapReduce-performance-on-the-HBase-input-table/m-p/163413#M45219 arunkumar_d 2016-11-03T19:48:17Z https://community.cloudera.com/t5/Archives-of-Support-Questions/MapReduce-performance-on-the-HBase-input-table/m-p/163414#M45220 <P>TableInputFormat used in HBase will create 1 map task per table region. The data size will depend on how big your regions are. </P> Fri, 04 Nov 2016 00:56:32 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/MapReduce-performance-on-the-HBase-input-table/m-p/163414#M45220 Enis 2016-11-04T00:56:32Z