[HIVE-15988] LLAP: cache ORC ACID delete deltas

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Component/s: llap, Transactions
• Assignee: Teddy Choi Assign to me
• Reporter: Teddy Choi
• Created: 20/Feb/17 12:05
• Updated: 15/Feb/21 14:28
• Resolved: 15/Feb/21 14:28

Description

HIVE-12631 implemented ORC ACID table support in LLAP. If we cache ACID delete delta in LLAP, it will be faster.

The cache is currently low-level (CB-level in ORC), so we could just use it to read bases and deltas (deltas should be cached with higher priority) and merge as usual. We could also cache merged representation in future.

Issue Links

• duplicates: HIVE-24337 Cache delete delta files in LLAP cache
• is related to: HIVE-12631 LLAP IO: support ORC ACID tables
• requires: HIVE-14035 Enable predicate pushdown to delta files created by ACID Transactions
• links to: Review Board