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https://issues.apache.org/jira/browse/HIVE-18512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Vary reassigned HIVE-18512:
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Assignee: (was: Peter Vary)
> Get Results ReadAhead
> ---------------------
>
> Key: HIVE-18512
> URL: https://issues.apache.org/jira/browse/HIVE-18512
> Project: Hive
> Issue Type: Improvement
> Components: HiveServer2
> Affects Versions: 2.4.0, 3.0.0
> Reporter: David Mollitor
> Priority: Minor
>
> 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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