[
https://issues.apache.org/jira/browse/HIVE-20279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16563948#comment-16563948
]
Gopal V commented on HIVE-20279:
--------------------------------
This is a good catch, also because it is easier to fix this via the
block-offset (all handlers can be set to -1, after first entry into 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: 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
