Github user zhangminglei commented on the issue:
https://github.com/apache/flink/pull/4202
Seems I could not get any useful information from CI, except for this kinda
stuff following and it seems not relevant to this issue.
```
Running org.apache.flink.test.recovery.JobManagerHACheckpointRecoveryITCase
java.lang.RuntimeException: org.apache.zookeeper.server.ZooKeeperServer
class is frozen
at javassist.CtClassType.checkModify(CtClassType.java:288)
at javassist.CtBehavior.setBody(CtBehavior.java:432)
at javassist.CtBehavior.setBody(CtBehavior.java:412)
at
org.apache.curator.test.ByteCodeRewrite.fixMethods(ByteCodeRewrite.java:91)
at
org.apache.curator.test.ByteCodeRewrite.<clinit>(ByteCodeRewrite.java:50)
at org.apache.curator.test.TestingServer.<clinit>(TestingServer.java:33)
at
org.apache.flink.test.recovery.JobManagerHACheckpointRecoveryITCase.testCheckpointedStreamingProgram(JobManagerHACheckpointRecoveryITCase.java:345)
at
org.apache.flink.test.recovery.JobManagerHACheckpointRecoveryITCase.testCheckpointedStreamingProgramIncrementalRocksDB(JobManagerHACheckpointRecoveryITCase.java:331)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
```
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