[IGNITE-14003] OOM on creating rebalance iterator while rebalancing cache with large values.

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.9, 2.8.1, 2.9.1
• Fix Version/s: 2.10
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Ivan Daschinsky
• Reporter: Ivan Daschinsky
• Created: 16/Jan/21 14:23
• Updated: 21/Jan/21 18:49
• Resolved: 18/Jan/21 15:16

Description

Scenario
1. Start replicated cache on ignite node, memory region approx 6 Gb, heap 1Gb
2. Load significant amount of data to cache with values approx 200Kb (~20K kv pairs)
3. Start another node
First node (supplier) will crash while initializing rebalance iterator with OOM
Main reason – all values, to whon pointed from leaf of BTree, are all loaded to buffer in BPlusTree#ForwardCursor. For replicated cache, 512 iterators for each partition are created at once.

Reproducer is attached, run it with -Xmx1G

Issue Links

• links to: GitHub Pull Request #8671