[
https://issues.apache.org/jira/browse/HBASE-22980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Shardul Singh updated HBASE-22980:
----------------------------------
Description:
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:
# 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.
{code:java}
{code}
was:
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.
> 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
> Components: mapreduce
> Reporter: Shardul Singh
> Assignee: Shardul Singh
> Priority: Minor
>
> 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:
> # 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.
> {code:java}
> {code}
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