Github user VipinRathor commented on the issue:

    https://github.com/apache/zeppelin/pull/2330
  
    @prabhjyotsingh 
    Thanks for reviewing this.
    
    > any specific reason for chaning ldapRealm = 
org.apache.zeppelin.realm.LdapRealm to 
ldapRealm=org.apache.zeppelin.realm.LdapRealm in all the lines ?
    
    Earlier there were lines with mixed spacing, I just wanted to keep it 
uniform. We can choose any one style that you want.
    
    > I notice you have removed these two;
    >
    >    ldapRealm.contextFactory=$ldapGroupContextFactory
    >    ldapRealm.contextFactory.systemAuthenticationMechanism=simple
    >
    > any specific reason?
    
    Yes, if you keep the first one, Shiro will throw error that 
ldapGroupContextFactory is not defined anywhere so can't be used. And in fact, 
the sample configuration is actually not defining any such 
ldapGroupContextFactory. Instead `LdapRealm` is using `JndiLdapContextFactory` 
, so no need to override a contextFactory.
    
    For `systemAuthenticationMechanism`, there is neither such configuration 
available in `JndiLdapContextFactory` nor `LdapRealm` introduced any. Looks 
like a left over from earlier configuration set, hence removed.


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