[LUCENE-5373] Lucene42DocValuesProducer.ramBytesUsed is over-estimated

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.6.1
• Lucene Fields: New
• Assignee: Adrien Grand
• Reporter: Adrien Grand
• Created: 19/Dec/13 18:02
• Updated: 28/Aug/22 13:58
• Resolved: 20/Dec/13 17:50

Description

Lucene42DocValuesProducer.ramBytesUsed uses RamUsageEstimator.sizeOf(this) to return an estimation of the memory usage. One of the issues (there might be other ones) is that this class has a reference to an IndexInput that might link to other data-structures that we wouldn't want to take into account. For example, index inputs of a RAMDirectory all point to the directory itself, so Lucene42DocValuesProducer.ramBytesUsed would return the amount of memory used by the whole directory.