Specifying connection url option failover='singlebroker' causes the wrong
failover policy to be used
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Key: QPID-3220
URL: https://issues.apache.org/jira/browse/QPID-3220
Project: Qpid
Issue Type: Bug
Components: Java Client
Affects Versions: 0.5, 0.10
Reporter: Keith Wall
Priority: Minor
If the user specifies the option failover='singlebroker' in the connection URL,
an coding error in FailoverPolicy.java means that the client actually elects to
use FailoverRoundRobinServers policy rather than FailoverSingleServer.
For example, the following URL will cause the client to use the round-robin
policy.
{code}
amqp://guest:guest@clientid/test?brokerlist='tcp://localhost:5672?retries='50'&connectdelay='5000''&failover='singlebroker'
{code}
Furthermore, as the logic FailoverRoundRobinServers.getNextBrokerDetails means
that if the roundrobin policy is used with a brokerlist containing *one
broker*, connectdelay is never applied, this defect also means that if a user
passes failover='singlebroker' with a broker list containing one entry,
connectdelay is ignored. This can give the appearance that server
reconnection is broken as the client can spin through thousands of retries
before then broker has chance to restart.
To workaround this issue, the user can omit the failover option from the URL
and let the defaulting within FailoverPolicy class choose FailoverSingleServer
if the brokerlist contains one entry, or FailoverRoundRobinServers if the list
contains more than one.
Client will default to singlebroker policy:
{code}
amqp://guest:guest@clientid/test?brokerlist='tcp://localhost:5672'
{code}
Client will default to roundrobin policy:
{code}
amqp://guest:guest@clientid/test?brokerlist='tcp://localhost:5672;tcp://localhost:5672'
{code}
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