Rohini Palaniswamy created PIG-5324:
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Summary: Stream the first input in Tez for skewed, bloom and
replicate joins
Key: PIG-5324
URL: https://issues.apache.org/jira/browse/PIG-5324
Project: Pig
Issue Type: New Feature
Reporter: Rohini Palaniswamy
In PIG-5323, the code streams the last input similar to MR. In MR only last
input can be streamed because it is read last (key values are sorted by index).
But in Tez since each input (except for cases of self-join) is separate. So it
is possible to either stream the first or the last input. For the cases of
skewed join, bloom join and replicate join it is the left most dataset that is
always big. So we should stream that instead of the right most dataset.
If we actually had sizes of each input (from counters), we can choose which
input to stream dynamically during runtime. This can help with cases of regular
join where people have not placed the bigger dataset as the right most one.
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