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https://issues.apache.org/jira/browse/IMPALA-5212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16487761#comment-16487761
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Tim Armstrong commented on IMPALA-5212:
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I think it's possible that this could affect remote read performance for larger
scan ranges > 8mb - I think the non-pread implementation has some kind of
prefetching built-in.
> consider switching to pread by default
> --------------------------------------
>
> Key: IMPALA-5212
> URL: https://issues.apache.org/jira/browse/IMPALA-5212
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Silvius Rus
> Assignee: Joe McDonnell
> Priority: Major
>
> 1) Review the current HDFS tests. Validate that we have sufficient coverage,
> add coverage if need be.
> 2) Switch to pread as default.
> 3) Consider deprecating the old read path.
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