Problem:  

Unable to install a new collector or the collector installation fails and goes offline.

Possible Cause:

Collector JVM has run into memory issues.

Log Message: 

INFO   | jvm 1    | 2017/02/17 08:18:03 | WrapperSimpleApp Error: java.lang.OutOfMemoryError: GC overhead limit exceeded
STATUS | wrapper  | 2017/02/17 08:18:03 | The JVM has run out of memory.  Restarting JVM.

Solution:

The above messages from the collector.out.log file indicate that the collector is running out of memory. 

In order to remediate that you need to go ahead and increase the collector memory to atleast a new value from what it is being set up currently as given below in the user.properties configuration file:

wrapper.java.maxmemory= <value>

Increase the value by doubling up the current value which should help. 

After performing the above changes restart the Collector using the command:

[install_directory]/collector restart.

For more info: Increase memory in a Collector