[HDDS-6428] Add prefix iterator support to RDBTable.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0
• Labels: pull-request-available
• Assignee: Mark Gui
• Reporter: Mark Gui
• Created: 08/Mar/22 08:07
• Updated: 20/Oct/22 03:44
• Resolved: 29/Mar/22 16:07

Description

So after rocksdb-merge, in schema v3, we will have containerID as key prefixes for all keys in per-disk rocksdb instances.

We should add support for iterating the keys with prefixes.

We can add a new field --  "prefix" – in existing RDBStoreIterator.

Then we check for the prefix field to decide how to iterate through all the keys:

• if we have the prefix set, then we seek to the first key with the prefix before iteration and end iteration upon the first key doesn’t match the prefix.
• else we keep the old way of iterating.

Issue Links

• fixes: HDDS-6520 Refactor RDBTable#getRangeKVs()
• links to: GitHub Pull Request #3176