Aman Sinha created DRILL-4667:
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Summary: Improve memory footprint of broadcast joins
Key: DRILL-4667
URL: https://issues.apache.org/jira/browse/DRILL-4667
Project: Apache Drill
Issue Type: Improvement
Components: Execution - Relational Operators
Affects Versions: 1.6.0
Reporter: Aman Sinha
For broadcast joins, currently Drill optimizes the data transfer across the
network for broadcast table by sending a single copy to the receiving node
which then distributes it to all minor fragments running on that particular
node. However, each minor fragment builds its own hash table (for a hash join)
using this broadcast table. We can substantially improve the memory footprint
by having a shared copy of the hash table among multiple minor fragments on a
node.
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