We have a requirement to be able to query Accumulo within a time window (start
AND stop date). The standard AgeOffFilter allows us to get rid of the data
that is too old, but we don't have any easy way to get rid of the data that is
too new.
I know I can write my own filter implementation, but as I understand it, that
requires deploying a JAR across the cloud which is undesirable in our situation.
We've work around the issue by creating two AgeOffFilters. One gets rid of the
data that is too old. The other accepts data from the current time ("now")
until the time window stop date (i.e., the data that is too new). And then we
apply negate()to that filter.
It seems to me a minor change to the AgeOffFilter would allow that class to
handle both cases (age off and time windows):
1. Provide an optional Boolean flag if the "too new" data should be
ignored as well (defaulting to false to maintain backwards compatibility).
2. In "accept", if the flag is set and "currentTime - k.getTimestamp()"
is negative return false.
Any interest in this change, or providing an alternative class (e.g.,
"TimeWindowFilter")? Or does the capability already exist somewhere and I am
just missing it?
Thanks,
Dennis
Dennis Patrone
The Johns Hopkins University / Applied Physics Laboratory
240-228-2285 / Washington
443-778-2285 / Baltimore
443-220-7190 / Cell
[email protected]<mailto:[email protected]>
