zhaoxunyong opened a new issue #3448: Clients of Skywalking cannot be register 
by themselves.
URL: https://github.com/apache/skywalking/issues/3448
   Please answer these questions before submitting your issue.
   - Why do you submit this issue?
   - [ ] Question or discussion
   - [ ] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   ### Bug
   - Which version of SkyWalking, OS and JRE?
   SkyWalking: 6.3.0
   OS: 7.6.1810
   JRE: 1.8
   - What happen?
   My skywalking has the error - "java.lang.OutOfMemoryError: Java heap space" 
occurred. After I adjusted the JVM options and reboot the server(not agent), 
but I found some of my clients could't be register by themselves. the logs as 
the following:
   The angent logs:
   DEBUG 2019-09-10 18:10:15:408 
ServiceAndEndpointRegisterClient :  ServiceAndEndpointRegisterClient running, 
   2019-09-10 19:06:23,556 - 
 - 108 [grpc-default-executor-36] WARN  [] - Service instance 177 heartbeat, 
but not found in storage. 2019-09-10 19:06:23,557 - 
 - 68 [grpc-default-executor-36] WARN  [] - Can't find service by service 
instance id from cache, service instance id is: 177, will send a reset command 
to agent side
   I thought rebooting the agant will be recovered. I rememberd this version 
will register by themselves automatically, I don't need to restart angent any 
more. but why will it happen?
   Please help me out to to diagnose the issues. 

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