[HAMA-154] [Performance]Combine multi-mapreduce jobs into a single mapreduce job while computing such as 'C=alpha*B + A'

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: math
• Assignee: Unassigned
• Reporter: Sijie Guo
• Created: 23/Feb/09 01:45
• Updated: 08/Jun/11 09:32
• Resolved: 10/Mar/09 00:37

Description

now, In Hama we use two map-reduce jobs to do 'C=alpha*B + A'.
first job is to generate a matrix B' = alpha * B
second job is to generate the result matrix C = B' + A
I think the first map-reduce job is unneccesary for we can do the constant-multiplication during Addition-MapReducing.

And we also encount the same problem during computing 'A1 + A2 + ... + An'.
we need to generate (n-1) hbase-tables for the temp results during addition. Can we just combine n-1 addition-mapreduce jobs into only a simple one?

Sub-Tasks

• Example for C = Alpha*B + A: Resolved