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From "Wayne (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4187) Add Thrift Column Start/Stop Read/Scan Capability
Date Wed, 10 Aug 2011 19:24:28 GMT
Add Thrift Column Start/Stop Read/Scan Capability
-------------------------------------------------

                 Key: HBASE-4187
                 URL: https://issues.apache.org/jira/browse/HBASE-4187
             Project: HBase
          Issue Type: New Feature
          Components: thrift
    Affects Versions: 0.90.3
            Reporter: Wayne


It would be great to be able to make requests through thrift for a subset of a row via a start/stop
column pattern. Below are three different read patterns any of which would significantly help
reading columns through thrift. 

>From a single request perspective it would be nice to be able to specify a start/stop
col to read in one call everything for that row with the specified start/stop column.

getRowWithColumnRange(tableName, row, startColumn, stopColumn)


It would also be very useful to set up a column scanner where we could stop at any point.
Basically instead of scanning rows we would scan columns for a given row. In the below example
we would set up a scanner to scan the columns and we could read xx cols back at a time and
stop any time we had "enough" data.

colScanID = colScannerOpenWithStop(tableName, row, startColumn, stopColumn)
colScannerGetList(colSanID,1000)


Lastly is would also be useful/flexible to expose columns to the current row scanner process
to basically be able to cross rows and still only receive XX column values. The new scannerGetCols
method below would return 1000 col values at a time instead of XX rows at a time like a normal
scannerGetList. This scanner would also be able to cross rows seamlessly if needed.

scanID = scannerOpen(tableName, row)
scannerGetCols(scanID,1000)



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