Di Li created AMBARI-12751:
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             Summary: MapRed history server is shown as stopped after downgrade
                 Key: AMBARI-12751
                 URL: https://issues.apache.org/jira/browse/AMBARI-12751
             Project: Ambari
          Issue Type: Bug
    Affects Versions: 2.1.0
            Reporter: Di Li


RU precheck requires "mapreduce.jobhistory.recovery.store.class" property to be 
set in the mapred-site.xml with value 
"org.apache.hadoop.mapreduce.v2.hs.HistoryServerLeveldbStateStoreService"

With this value set, the HDP 2.2 level MapRed history server can not start. It 
shows an err about class  
org.apache.hadoop.mapreduce.v2.hs.HistoryServerLeveldbStateStoreService does 
not exist.

When downgrading, the mapred properties added to pass the RU precheck needs to 
be removed.



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