morningman commented on issue #5292:
URL: 
https://github.com/apache/incubator-doris/issues/5292#issuecomment-785196915


   This is because httpv2 modified the response body, which causes 
incompatibility.
   
   The new FE will try to pull the current image file from the Master FE when 
it is started,
   but because the http interface is incompatible, the pull fails. 
   However, FE did not exit at this time, but continued the startup process.
   
   At this time, FE will join the BDBJE electable group and start to try to 
replay the log from 1.
   But because log 1 no longer exists, FE will report an error:
   
   `Can not find the key:1, fail to get journal cursor. will exit.`
   
   And exit.
   
   This will cause the electable group to hang up when there are only two FE 
nodes and one is down.
   At this time, when the Master tries to write log again, it will fail because 
it cannot satisfy the majority of writes,
   and it will eventually down.


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