[HDDS-4570] Reduce memory footprint of OMUpdateEventBatch for Recon when processing OM update events

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.1.0
• Labels: pull-request-available
• Target Version/s: 1.1.0
• Assignee: Siyao Meng
• Reporter: Siyao Meng
• Created: 09/Dec/20 21:26
• Updated: 13/Jan/21 21:14
• Resolved: 13/Jan/21 21:14

Description

We are experiencing OOM when Recon heap size is too small (1GB) and it looks like OMUpdateEventBatch#events is taking most of them.

Goal:
1. Reduce new object creation when Recon is consuming batches OM events (consumeOMEvents)
2. Improve OMUpdateEventBatch#filter to reduce memory usage. e.g. avoid generating a new list?

Issue Links

• links to: GitHub Pull Request #1680