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https://issues.apache.org/jira/browse/HIVE-20279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16572493#comment-16572493
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Ashutosh Chauhan commented on HIVE-20279:
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OK. [~nishantbangarwa] Suggestion is to make getPos() in DruidRecordReader to
return -1; (instead of 0) so that we never get in this loop.
> HiveContextAwareRecordReader slows down Druid Scan queries.
> ------------------------------------------------------------
>
> Key: HIVE-20279
> URL: https://issues.apache.org/jira/browse/HIVE-20279
> Project: Hive
> Issue Type: Improvement
> Reporter: Nishant Bangarwa
> Assignee: Nishant Bangarwa
> Priority: Major
> Attachments: HIVE-20279.1.patch, HIVE-20279.patch, scan2.svg
>
>
> HiveContextAwareRecordReader add lots of overhead for Druid Scan Queries.
> See attached flame graph.
> Looks like the operations for checking for existence of footer/header buffer
> takes most of time For druid and other storage handlers that do not have
> footer buffer we should skip the logic for checking the existence for storage
> handlers atleast.
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