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From "Bryan Duxbury (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-489) CellValue class for transporting cell timestamp with cell value simultaneously
Date Tue, 04 Mar 2008 00:18:51 GMT
CellValue class for transporting cell timestamp with cell value simultaneously
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                 Key: HBASE-489
                 URL: https://issues.apache.org/jira/browse/HBASE-489
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: Bryan Duxbury
            Priority: Minor


All of the get* methods take a timestamp parameter that means "at least as old as X". This
is handy for getting data that fits your expectations about when it should exist. However,
the result you get back doesn't actually contain the real timestamp the cell was stored at.


For example, let's say you write the stock price for your favorite company into row "YHOO"
at cell "stock:price". It takes the default timestamp of right now. Then, a day passes. You
want to get the most recent stock price for YHOO, and also when the price was gathered. In
the current system, you couldn't do this at all without also doing a scan at the same time.


If we added a new class called CellValue that contained the byte[] cell value as well as the
long timestamp of when it was stored, we could return an instance of this class wherever we
used to return just the byte[]. This could be used in all the get() methods, getRow, getClosestAtOrBefore,
etc. This has the advantage of making timestamp into a first-class citizen in HBase, which
it hasn't been so far.

Thoughts?

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