[FLINK-5715] Asynchronous snapshotting for HeapKeyedStateBackend

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.0
• Fix Version/s: 1.3.0
• Component/s: Runtime / State Backends
• Assignee: Stefan Richter
• Reporter: Stefan Richter
• Created: 06/Feb/17 09:08
• Updated: 24/Mar/17 17:54
• Resolved: 16/Mar/17 17:39

Description

Blocking snapshots render the HeapKeyedStateBackend practically unusable for many user in productions. Their jobs can not tolerate stopped processing for the time it takes to write gigabytes of data from memory to disk. Asynchronous snapshots would be a solution to this problem. The challenge for the implementation is coming up with a copy-on-write scheme for the in-memory hash maps that build the foundation of this backend. After taking a closer look, this problem is twofold. First, providing CoW semantics for the hashmap itself, as a mutible structure, thereby avoiding costly locking or blocking where possible. Second, CoW for the mutable value objects, e.g. through cloning via serializers.

Issue Links

• is duplicated by: FLINK-5958 Asynchronous snapshots for heap-based keyed state backends
• links to: GitHub Pull Request #3466
• links to: GitHub Pull Request #3602