Xi Chen created KYLIN-4753:
------------------------------
Summary: Merging job stop working after Kylin upgrade
Key: KYLIN-4753
URL: https://issues.apache.org/jira/browse/KYLIN-4753
Project: Kylin
Issue Type: Bug
Components: Job Engine
Affects Versions: v2.6.4, v3.0.0
Reporter: Xi Chen
Cubes stop auto merging after upgrading to Kylin to 2.6.4+ or 3.0.0+.
Following stack is thrown in log:
```
2020-09-09 17:57:52 ERROR - [Thread-1131] -
org.apache.kylin.rest.service.CacheService$1$1(83) - Error in
updateOnNewSegmentReady()
java.lang.NullPointerException
at
org.apache.kylin.rest.service.CubeService.isMergingJobBeenDiscarded(CubeService.java:800)
at
org.apache.kylin.rest.service.CubeService.mergeCubeSegment(CubeService.java:776)
at
org.apache.kylin.rest.service.CubeService.updateOnNewSegmentReady(CubeService.java:722)
at
org.apache.kylin.rest.service.CubeService$$FastClassBySpringCGLIB$$17a07c0e.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:667)
at
org.apache.kylin.rest.service.CubeService$$EnhancerBySpringCGLIB$$1737fa4f.updateOnNewSegmentReady(<generated>)
at org.apache.kylin.rest.service.CacheService$1$1.run(CacheService.java:81)
```
If cube has segments discarded before upgrading, the job instance does not have
`segmentName` param. The problem is brought in KYLIN-4057.
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