[jira] [Created] (HBASE-22980) HRegionPartioner getPartition() method incorrectly partitions the regions of the table.

["Shardul Singh (Jira)" <ji...@apache.org>]

Shardul Singh created HBASE-22980:
-------------------------------------

             Summary: HRegionPartioner getPartition() method incorrectly partitions the regions of the table.
                 Key: HBASE-22980
                 URL: https://issues.apache.org/jira/browse/HBASE-22980
             Project: HBase
          Issue Type: Bug
         Environment: Instead of
{code:java}
if(i >= numPartitions-1) 
{code}
It should be
{code:java}
if(i >= numPartitions) 
{code}
            Reporter: Shardul Singh
            Assignee: Shardul Singh


In HRegionPartitioner getPartition(), the case where we have less reduces than region is incorrect.

https://github.com/apache/hbase/blob/fbd5b5e32753104f88600b0f4c803ab5659bce64/hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/HRegionPartitioner.java#L92

Consider the following scenario:

1. if there are 5 regions for the table, partitions = 5 and number of reducers is also 5.
So in this case above code should not return true. But for the last region when i=4, getPartition should return 4 but it returns 2 because it falls in the case of when we have less reduces than region and returns true for the above condition. 



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