- The compactor (for use with ACID tables) cannot be run without Hive. ACID tables can be read and written to, but they cannot compacted.
- Replication has not been tested outside of Hive.
Prior to Hive 3.0 there was only a single implementation of the MetaStore API (called
ObjectStore). HIVE-16520 introduced a second implementation that can cache objects from the database in memory. This can save a significant amount of time for round trips to the database. It can be used by changing the parameter
The cache is automatically updated with new data when changes are made through this MetaStore. In a scenario where there are multiple MetaStore servers the caches can be out of date on some of them. To prevent this the CachedStore automatically refreshes the cache in a configurable frequency (default: 1 minute).
Details about all properties for the CachedStore can be found on Configuration Properties (Prefix:
Less Commonly Changed Configuration Parameters