Chinmay Kulkarni created PHOENIX-6092:
-----------------------------------------
Summary: Queue DDL requests issued while metadata upgrade is in
progress and replay on upgrade failure
Key: PHOENIX-6092
URL: https://issues.apache.org/jira/browse/PHOENIX-6092
Project: Phoenix
Issue Type: Improvement
Affects Versions: 4.15.0, 5.0.0
Reporter: Chinmay Kulkarni
Assignee: Chinmay Kulkarni
Fix For: 5.1.0, 4.16.0
Currently, if a metadata upgrade is in progress (either triggered by an
explicit "EXECUTE UPGRADE" command or by a new client with autoUpgrade
enabled), in-flight DDLs will generally go through and work as expected.
However, if the upgrade happens to fail, we restore the snapshot of
SYSTEM.CATALOG (and with
[PHOENIX-6086|https://issues.apache.org/jira/browse/PHOENIX-6086] even other
SYSTEM tables) to represent its state before the upgrade started. Due to this,
any DDLs issued after the upgrade began are lost.
This Jira is to discuss ways to tackle this problem. Perhaps we should use some
sort of write-ahead log to store DDLs issued while the upgrade is in progress
and replay those DDLs in case we need to restore SYSTEM tables from their
snapshot.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
