Pause option in AEM replication agent queue

At some point we need to stop the replication from AEM author to publisher for sometime or few minutes, so that no content get published from author to publisher instance. This may we need to handle the maintenance window or stop accepting new content from authors. So question here is how we can do this without disabling the AEM replication queue. 

How to pause the replication agent queue?

Out of the box AEM replication agent queue have an option "pause", using that pause option we could stop the replication. When you will pause the queue then all content which will get published by authors during that time frame will be enlist in the queue but those will not get processed. Pause option will only pause your queue but your replication queue will be still enabled and active.

Active AEM replication queue:

Paused AEM replication queue:

Points to be remember:

• When we will restart our instance then this paused status will be override and we will find queue is active.
• By default it will pause for an hour.

Hope this help you to understand the pause option and its role in AEM replication queue.

References:

1. Troubleshoot AEM replication queue

Failure authenticating with BASIC 'Sling (Development)'

Issue: When we try to replicate anything from author to publisher I am getting below error. and not even on any replication it keep printing the log in error.log file automatically after an interval. What could be the cause of this? 

24.10.2019 11:31:05.942 *INFO* [oak-repository-executor-1] com.adobe.granite.repository Service [34344, [org.apache.jackrabbit.oak.api.jmx.SessionMBean]] ServiceEvent REGISTERED
24.10.2019 11:31:20.180 *INFO* [sling-default-2812-com.day.cq.replication.impl.ReverseReplicator.22529] org.apache.commons.httpclient.auth.AuthChallengeProcessor basic authentication scheme selected
24.10.2019 11:31:20.180 *INFO* [sling-default-2812-com.day.cq.replication.impl.ReverseReplicator.22529] org.apache.commons.httpclient.HttpMethodDirector Failure authenticating with BASIC 'Sling (Development)'@localhost:4503
24.10.2019 11:31:24.323 *INFO* [oak-repository-executor-1] com.adobe.granite.repository Service [34345, [org.apache.jackrabbit.oak.api.jmx.SessionMBean]] ServiceEvent REGISTERED

Resolution: This error message you are getting because, AEM author replication agent is unable to communicate with publisher instance due to bad credential (username and password). You might change the password of admin user in publisher and forget to update the password on default author agent. Once you will update the valid authentication credential in default author replication agent this error will be no more logged in the error.log file.

By default AEM system keep generating events and try to transport the same to publisher instance, every time it send the replication request to replication agent the authentication get failed thats why this log is get printed after a certain interval. 

Reference:

https://helpx.adobe.com/in/experience-manager/6-3/sites/deploying/using/replication.html