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From "Michael Segel (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12853) distributed write pattern to replace ad hoc 'salting'
Date Wed, 14 Jan 2015 13:16:34 GMT
Michael Segel  created HBASE-12853:

             Summary: distributed write pattern to replace ad hoc 'salting'
                 Key: HBASE-12853
                 URL: https://issues.apache.org/jira/browse/HBASE-12853
             Project: HBase
          Issue Type: New Feature
            Reporter: Michael Segel 
            Priority: Minor

In reviewing HBASE-11682 (Description of Hot Spotting), one of the issues is that while 'salting'
alleviated  regional hot spotting, it increased the complexity required to utilize the data.

Through the use of coprocessors, it should be possible to offer a method which distributes
the data on write across the cluster and then manages reading the data returning a sort ordered
result set, abstracting the underlying process. 

On table creation, a flag is set to indicate that this is a parallel table. 

On insert in to the table, if the flag is set to true then a prefix is added to the key. 
e.g. <region server#>- or <region server #|| where the region server # is an integer
between 1 and the number of region servers defined.  

On read (scan) for each region server defined, a separate scan is created adding the prefix.
Since each scan will be in sort order, its possible to strip the prefix and return the lowest
value key from each of the subsets. 

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