Alan Conway created QPID-4360:
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Summary: Non-ready HA broker can be incorrectly promoted
Key: QPID-4360
URL: https://issues.apache.org/jira/browse/QPID-4360
Project: Qpid
Issue Type: Bug
Components: C++ Clustering
Affects Versions: 0.18
Reporter: Alan Conway
Assignee: Alan Conway
Description of problem:
rgmanager can promote a non-ready backup HA broker to primary when other backup
brokers are available in the ready state. This can result in loss of messages
and broker configuration. Additionally, this can cause the previously ready
backups to throw exceptions when connecting to the new primary:
Sep 20 10:17:18 itcm12 qpidd[10871]: 2012-09-20 10:17:18 [HA] critical Backup
queue Queue1: Replication failed: Invalid position move, preceeds messages
Sep 20 10:17:18 itcm12 qpidd[10871]: 2012-09-20 10:17:18 [Protocol] error
Unexpected exception: Invalid position move, preceeds messages
Sep 20 10:17:18 itcm12 qpidd[10871]: 2012-09-20 10:17:18 [Broker] error
Connection 10.3.100.12:43837-10.3.100.105:9006 closed by error: Invalid
position move, preceeds messages(501)
Version-Release number of selected component (if applicable):
Qpid 0.18
How reproducible:
100%
Steps to Reproduce:
1. Start a primary and backup broker
2. Inject messages into the primary and ensure messages replicate to backup
3. Restart the primary broker and manually re-promote to primary
Actual results:
Restarted broker becomes primary
Expected results:
Restarted broker refuses to become primary since at least one ready backup was
discovered within some timeout
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