Teddy Choi created HIVE-26555:
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Summary: Read-only mode
Key: HIVE-26555
URL: https://issues.apache.org/jira/browse/HIVE-26555
Project: Hive
Issue Type: New Feature
Reporter: Teddy Choi
Assignee: Teddy Choi
h1. Purpose
In failover/fail-back scenarios, a Hive instance needs to be read-only, while
other one is writable to keep a single source of truth.
h1. Design
EnforceReadOnlyHiveHook class can implement ExecuteWithHookContext interface.
hive.exec.pre.hooks needs to have the class name to initiate an instance.
"hive.enforce.readonly" can be configured to turn it on and off.
h2. Allowed operations prefixes
* USE(or SWITCHDATABASE)
* SELECT
* DESC
* DESCRIBE
* SET
* EXPLAIN
* ROLLBACK
* KILL
* ABORT
h1. Tests
* read_only_hook.q: USE, SHOW, DESC, DESCRIBE, EXPLAIN, SELECT
* read_only_hook_delete_failure.q
* read_only_hook_insert_failure.q
* read_only_hook_update_failure.q
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