blackfox1983 opened a new issue #4673:
URL: https://github.com/apache/incubator-doris/issues/4673
**Describe the bug**
i upgrade my doris cluster to master version.
and found error in fe'restart.
check the log and found content as below:
```
2020-09-26 11:37:18,961 WARN (UNKNOWN
172.28.18.140_9010_1591588831143(-1)|1)
[Catalog.notifyNewFETypeTransfer():2356] notify new FE type transfer: UNKNOWN
2020-09-26 11:37:20,967 WARN (RepNode
172.28.18.140_9010_1591588831143(-1)|56)
[Catalog.notifyNewFETypeTransfer():2356] notify new FE type transfer: MASTER
2020-09-26 11:37:21,162 ERROR (stateListener|67) [EditLog.loadJournal():804]
Operation Type 29
java.lang.NullPointerException: null
at
org.apache.doris.consistency.ConsistencyChecker.replayFinishConsistencyCheck(ConsistencyChecker.java:373)
~[palo-fe.jar:3.4.0]
at org.apache.doris.persist.EditLog.loadJournal(EditLog.java:332)
[palo-fe.jar:3.4.0]
at org.apache.doris.catalog.Catalog.replayJournal(Catalog.java:2497)
[palo-fe.jar:3.4.0]
at
org.apache.doris.catalog.Catalog.transferToMaster(Catalog.java:1167)
[palo-fe.jar:3.4.0]
at org.apache.doris.catalog.Catalog.access$1100(Catalog.java:261)
[palo-fe.jar:3.4.0]
at org.apache.doris.catalog.Catalog$4.runOneCycle(Catalog.java:2414)
[palo-fe.jar:3.4.0]
at org.apache.doris.common.util.Daemon.run(Daemon.java:116)
[palo-fe.jar:3.4.0]
```
**To Reproduce**
Steps to reproduce the behavior:
1. run command ```add follower ...`` on the old version of doris. (the
follower fe is not online now)
2. run ```bin/stop_fe.sh``` to stop the old version of fe
3. upgrade files to new version of fe. e.g. lib/* webroot/*
4. run ```bin/start_fe.sh``` to start the new version of fe
5. check the log than found the error as above
how to prevent in trick method.
1. rollback the version
2. run command ```drop follower ...``` on the old version of doris
3. upgrade files and restart fe
4. fe start ok
5. run ```add follower ...``` on the new version
**Expected behavior**
1. add follower on the old version whether the service survives or not
2. upgrade the version of fe
3. restart ok
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