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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3162) Add TimeRange support into Increment to optimize for counters that are partitioned on time
Date Thu, 28 Oct 2010 06:02:04 GMT
Add TimeRange support into Increment to optimize for counters that are partitioned on time
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                 Key: HBASE-3162
                 URL: https://issues.apache.org/jira/browse/HBASE-3162
             Project: HBase
          Issue Type: Improvement
          Components: client, regionserver
    Affects Versions: 0.90.0
            Reporter: Jonathan Gray
            Priority: Minor


In many use cases of increments, a given counter is only incremented during a specific window
of time (ie. the counters are partitioned/sharded by time).

With this kind of schema, you are constantly creating new counters.  When a new counter is
"created" (incremented the first time) you will always end up looking at a block from every
file in the region because no previous value will exist.  However, with the new TimeRange
optimizations that skip files if they don't contain values of the TimeRange you're interested
in, we could utilize that information to optimize the Get within the increment.

This would be optional and an addition to the Increment class.

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