[KUDU-3004] retain a history of PathSetPBs when updating directories

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: fs
• Assignee: Unassigned
• Reporter: Andrew Wong
• Created: 21/Nov/19 03:43
• Updated: 21/Nov/19 03:43

Description

Currently, kudu fs update_dirs will wipe away the existing PathSetPBs (i.e. those in the block_manager_instance files) and writes new ones that are representative of whatever the user has input as the new set of data directories. It'd be nice if we could retain a history of the PathSetPBs so we can more easily debug how and why a PathSetPB looks the way it does.

Adar and I chatted about this, about perhaps switching the path_set field of PathInstanceMetadataPB to be repeated.