Will Vaughan created DATAFU-11:
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Summary: ReservoirSample does not behave as expected when grouping
by a key other than ALL
Key: DATAFU-11
URL: https://issues.apache.org/jira/browse/DATAFU-11
Project: DataFu
Issue Type: Bug
Reporter: Will Vaughan
ReservoirSample does not behave as expected when grouping by a key other than
ALL.
It appears like the sample is done on the full input instead of the group input.
Given input:
a1,5
a1,6
a1,7
a2,5
a2,6
a2,7
with the following program
DEFINE ReservoirSample datafu.pig.sampling.ReservoirSample('2');
data = LOAD 'input.txt' USING PigStorage(',') AS (key: chararray, value:
chararray);
grouped = GROUP data BY key;
sample2 = FOREACH grouped GENERATE ReservoirSample(data);
the expected output should be similar to
(a1, {(a1,5),(a1,7)}
(a2, {(a2,5),(a2,7)}
However, actual output may show up as
(a1, {(a1,5),(a1,7)}
(a2, {(a1,5),(a1,7)}
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