[HIVE-23824] LLAP - add API to look up ORC metadata for certain Path

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Labels: pull-request-available
• Assignee: Ádám Szita
• Reporter: Ádám Szita
• Created: 09/Jul/20 13:48
• Updated: 17/Nov/22 08:48
• Resolved: 14/Jul/20 08:55

Description

LLAP IO supports caching but currently this is only done via LlapRecordReader / using splits, aka good old mapreduce way.

At certain times it would worth to leverage the caching of files on certain paths, that are not necessarily associated with a record reader directly. An example of this could be the caching of ACID delete delta files, as they are currently being read without caching.

With this patch we'd extend the LLAP API and offer another entry point for retrieving metadata of ORC files.

Issue Links

• is depended upon by: HIVE-23840 Use LLAP to get orc metadata
• links to: GitHub Pull Request #1238