zuston opened a new issue, #160:
URL: https://github.com/apache/incubator-uniffle/issues/160

   Currently, uniffle use the default Hadoop version of 2.8.5. 
   
   When using the `./build_distribution.sh --spark2-profile 'spark2' 
--spark3-mvn '-Dspark.version=2.4.3' --spark3-profile 'spark3' --spark3-mvn 
'-Dspark.version=3.1.1' -Dhadoop.version=2.6.0`, it will throw exceptions due 
to some methods and vars not supported in Hadoop 2.6.0.
   
   Some non-compatible params and methods as follows
   1. `CallContext`, introduced by >= 2.8.0. 
   2. `MRJobConfig.DEFAULT_SHUFFLE_MERGE_PERCENT` introduced by 2.8.0. [ticket 
link](https://issues.apache.org/jira/browse/MAPREDUCE-6105)
   3. `MRApps.getSystemPropertiesToLog` introduced by 2.8.0 [ticket 
link](https://issues.apache.org/jira/browse/MAPREDUCE-5232)
   
   I think we could use the reflection to be compatible with lower hadoop 
version.


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