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HBase, mail # user - Scans and Bloom Filter

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Scans and Bloom Filter
Bryan Beaudreault 2012-02-16, 02:18

We are looking at Bloom Filters and wondering if they are helpful when
doing a sequential read (multi-row scan) or only when doing a Get for a
single row.  It logically makes sense that it would only affect (or to
greater affect) getting a single row since it is a way for determining if
you have to read a whole store file when fetching a key.  But, we are told
that Scan and Get are essentially the same code on the backend, so I
imagine both will check the Blooms if they exist.

Also, would a ROWCOL bloom be more effective if you are often doing
multi-row scans but always with specifying only a subset of columns in
those rows?