[HIVE-17344] LocalCache element memory usage is not calculated properly.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Assignee: Janos Gub
• Reporter: Janos Gub
• Created: 17/Aug/17 11:00
• Updated: 22/May/18 23:58
• Resolved: 11/Sep/17 07:38

Description

Orc footer cache has a calculation of memory usage:

public int getMemoryUsage() {
  return bb.remaining() + 100; // 100 is for 2 longs, BB and java overheads (semi-arbitrary).
}

ByteBuffer.remaining returns the remaining space in the bytebuffer, thus allowing this cache have elements MAXWEIGHT/100 of arbitrary size. I think the correct solution would be bb.capacity.