BELUGA BEHR created HIVE-18512:
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Summary: Get Results ReadAhead
Key: HIVE-18512
URL: https://issues.apache.org/jira/browse/HIVE-18512
Project: Hive
Issue Type: Improvement
Components: HiveServer2
Affects Versions: 3.0.0, 2.4.0
Reporter: BELUGA BEHR
I don't have any data to back this up, but I wanted to put it on the radar.
It may be possible to improve performance of HS2 with an HDFS read-ahead reader
for result data. This would require adding a cache (configurable size) to the
Driver/Context object and adding a separate thread for loading results
asynchronously while the client is processing its current batch of results. It
seems that currently, results are loaded on demand.
https://github.com/apache/hive/blob/6d890faf22fd1ede3658a5eed097476eab3c67e9/ql/src/java/org/apache/hadoop/hive/ql/Driver.java#L2298
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