Jinfeng Ni created DRILL-4161:
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Summary: Make Hive Metastore client caching user configurable.
Key: DRILL-4161
URL: https://issues.apache.org/jira/browse/DRILL-4161
Project: Apache Drill
Issue Type: Bug
Reporter: Jinfeng Ni
Drill leverages LoadingCache in hive metastore client, in order to avoid the
long access time to hive metastore server. However, there is a tradeoff between
caching stale data and the possibility of cache hit.
For instance, DRILL-3893 changes cache invalidation policy to "1 minute after
last write", to avoid the chances of hitting stale data. However, it also
implies that the cached data would be only valid for 1 minute after
loading/write.
It's desirable to allow user to configure the caching policy, per their
individual use case requirement. In particular, we probably should allow user
to specify:
1) caching invalidation policy : expire after last access, or expire after last
write.
2) cache TTL.
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