I have several admin kit running at the same segment and each of the servers have their own slave servers. Previously my admin kit is using 6.0.1402 and we recently upgrade the build to the latest version 6.0.1572. However after the practice I find out that I couldnt run the same query which I created.

The custom events query is

type: info events;
event name: synchronization from slaves servers

Some of the admin kit in the same segment works fine but there are some which return with null.

In summary, let say that I have

Master servers: 4
slave servers: 16

Each master server have 4 slaves. 2 master server returns query results and another 2 did not. All of the master servers have the same spec and same version build.

what could be wrong here? why cant all of the master servers returns the info events of slave synchronization?

If I am using remote console do I get the return query or I should remote desktop to the servers?