[FLINK-6505] Proactively cleanup local FS for RocksDBKeyedStateBackend on startup

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.0
• Fix Version/s: 1.4.0, 1.5.0
• Component/s: Runtime / State Backends
• Assignee: Bowen Li
• Reporter: Stefan Richter
• Created: 09/May/17 08:55
• Updated: 23/Nov/17 19:02
• Resolved: 23/Nov/17 12:54

Description

In RocksDBKeyedStateBackend, the instanceBasePath is cleared on dispose(). I think it might make sense to also clear this directory when the backend is created, in case something crashed and the backend never reached dispose(). At least for previous runs of the same job, we can know what to delete on restart.

In general, it is very important for this backend to clean up the local FS, because the local quota might be very limited compared to the DFS. And a node that runs out of local disk space can bring down the whole job, with no way to recover (it might always get rescheduled to that node).

Issue Links

• links to: GitHub Pull Request #4798