I'm using a timestamp as a key and the value is all the relevant data
starting at that timestamp up to the timestamp represented by the key
of the next row.
When querying, I'm given a time span, consisting of a start and stop
time. I want to return all the relevant data within the time span, so
I was to retrieve the appropriate rows (then filter the data for the
given timespan).
Example:
In Accumulo: (the format of the value is <letter>.<timestamp>)
key=1 value= {a.1 b.1 c.2 d.2}
key=3 value= {m.3 n.4 o.5}
key=6 value={x.6 y.6 z.7}
Query: timespan=[2 4] (get all data from timestamp 2 to 4 inclusively)
Desire result: retrieve key=1 and key=3, then filter out a.1, b.1, and
o.5, and return the rest
Problem: How do I know to retrieve key=1 and key=3 without scanning
all the keys?
Can I create a scanner that looks for the given start key=2 and go to
the prior row (i.e. key=1)?
--
D. Lam
