Michael Segel created HBASE-12853:
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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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