spring-amqp: Channel shutdown with NACKS RECEIVED message - spring-amqp

Question

Using spring-amqp with heavy load on RabbitMQ bus, we sometimes get logs from org.springframework.amqp.rabbit.connection.CachingConnectionFactory saying :
Channel shutdown: clean channel shutdown; protocol method: #method<channel.close>(reply-code=200, reply-text=NACKS RECEIVED, class-id=0, method-id=0)
Can you explain this log, please, and why is it at ERROR level?
Do we have any adjustments to make?
Thanks in advance for your answer.

Answer 1

The channel throws an exception if all publisher confirms are not returned with the timeout...
#Override
public void waitForConfirmsOrDie(long timeout)
throws IOException, InterruptedException, TimeoutException
{
try {
if (!waitForConfirms(timeout)) {
close(AMQP.REPLY_SUCCESS, "NACKS RECEIVED", true, null, false);
throw new IOException("nacks received");
}
} catch (TimeoutException e) {
close(AMQP.PRECONDITION_FAILED, "TIMEOUT WAITING FOR ACK");
throw(e);
}
}
The DefaultChannelCloseLogger will only skip normal closes (200) if the reply text is OK...
/**
* Return true if the {#link ShutdownSignalException} reason is AMQP.Channel.Close and
* the reply code was AMQP.REPLY_SUCCESS (200) and the text equals "OK".
* #param sig the exception.
* #return true for a normal channel close.
*/
public static boolean isNormalChannelClose(ShutdownSignalException sig) {
Method shutdownReason = sig.getReason();
return isNormalShutdown(sig) ||
(shutdownReason instanceof AMQP.Channel.Close
&& AMQP.REPLY_SUCCESS == ((AMQP.Channel.Close) shutdownReason).getReplyCode()
&& "OK".equals(((AMQP.Channel.Close) shutdownReason).getReplyText()));
}
If you want to ignore these errors, you can configure a custom close exception logger:
/**
* Set the strategy for logging close exceptions; by default, if a channel is closed due to a failed
* passive queue declaration, it is logged at debug level. Normal channel closes (200 OK) are not
* logged. All others are logged at ERROR level (unless access is refused due to an exclusive consumer
* condition, in which case, it is logged at INFO level).
* #param closeExceptionLogger the {#link ConditionalExceptionLogger}.
* #since 1.5
*/
public void setCloseExceptionLogger(ConditionalExceptionLogger closeExceptionLogger) {
Assert.notNull(closeExceptionLogger, "'closeExceptionLogger' cannot be null");
this.closeExceptionLogger = closeExceptionLogger;
if (this.publisherConnectionFactory != null) {
this.publisherConnectionFactory.setCloseExceptionLogger(closeExceptionLogger);
}
}