[AMQ-6028] DNS search domain is dropped when looking up failover

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Abandoned
• Affects Version/s: 5.12.1
• Component/s: Connector, Transport
• Labels: DNS FailoverTransport failover transport

Environment

Linux

• Assignee: Unassigned
• Reporter: Henrik
• Created: 30/Oct/15 09:43
• Updated: 13/Mar/22 14:16
• Resolved: 13/Mar/22 14:16

Description

We have a setup with a network of two brokers. They're running on broker1.foo.bar.com and broker2.foo.bar.com.

We have a producer on producer.bar.com which would not failover when one of the brokers went down. We're using failover:(tcp://broker1.foo.bar.com:7250,tcp://broker2.foo.bar.com:7250) as the connect string.

We couldn't figure out why until we enabled debug logging:

[DEBUG] [2015-10-29T11:37:15,063] [ActiveMQ Task-4] Attempting  0th  connect to: tcp://broker1:7250  [FailoverTransport]
[DEBUG] [2015-10-29T11:37:15,068] [ActiveMQ Task-4] Connect fail to: tcp://broker1:7250, reason: java.net.UnknownHostException: broker1  [FailoverTransport]

(off topic: why is there only debug logging on failing attempts when there is info logging on successful attempts?)

Since the brokers are on foo.bar.com, and the producer is on bar.com, a hostname-only lookup fails.

Our workaround is to add foo.bar.com to the DNS search domain on producer.bar.com. (Either in /etc/resolv.conf or as a LOCALDOMAIN environment variable)