[HIVE-24259] [CachedStore] Constraints read from cache should be consistent snapshot.

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.0.0
• Fix Version/s: 4.0.0-alpha-1
• Component/s: Standalone Metastore
• Labels: pull-request-available
• Target Version/s: 4.0.0
• Assignee: Ashish Sharma
• Reporter: Ashish Sharma
• Created: 12/Oct/20 07:30
• Updated: 17/Nov/22 08:48
• Resolved: 22/Feb/21 04:41

Description

Description -

Problem -
1. Redundant check if table is present or not
2. Currently in order to get all constraint form the cachedstore. 6 different call is made with in the cached store. Which led to 6 different call to raw store
3. If constraints are null and valid then also a redundant call is made to raw store.

DOD
1. Create a flag which tell weather constraint snapshot is valid or not.
2. if incremental addition happen to any of the constraint mark snapshot as invalid and let updater thread to update cache with valid snapshot data.
3. Combine individual constraint call into one call for refresh and creation.

Issue Links

• Blocked: HIVE-23695 [CachedStore] Add check/default constraints in CachedStore
• is cloned by: HIVE-23834 [CachedStore] Add flag in TableWrapper in CacheStore to check if constraints are set or not
• links to: GitHub Pull Request #1610