Colin Patrick McCabe created HIVE-14065:
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Summary: Provide an API for making Hive read-only for a short
period
Key: HIVE-14065
URL: https://issues.apache.org/jira/browse/HIVE-14065
Project: Hive
Issue Type: Improvement
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
HIVE-7973 added a notification log which allows clients to do incremental
replication of the Hive metastore. However, it is a challenge to get the
initial state of the Hive database. Using existing APIs may give us an
inconsistent state. For example, if a Hive table is renamed while we're
loading all tables, we may miss that information.
The easiest way to fix this would be to provide an API for making Hive
read-only for a short period. This locking API would come with a timeout so
that if the locker failed, the system would not stay down. It would return an
ID which uniquely identified the lock instance. The read-only lock itself
could be implemented by taking all the ZooKeeper locks. The RPC for removing
the lock would return back a status indicating whether the lock had timed out
before being removed or not. If it had timed out, we could retry our snapshot
loading process with a longer timeout period.
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