[GitHub] [spark] HeartSaVioR edited a comment on issue #27042: [SPARK-30382] start-thriftserver --help throws ClassNotFoundException

[GitBox <gi...@apache.org>]

HeartSaVioR edited a comment on issue #27042: [SPARK-30382] start-thriftserver --help throws ClassNotFoundException
URL: https://github.com/apache/spark/pull/27042#issuecomment-569568378
 
 
   Looks like the problem is that Hive doesn't only leverage slf4j, but also leverages Log4j"2" API to programmatically configuring Log4j via configured in Hive conf. If I understand correctly, Spark uses Log4j 1, and that is also applied to hive-thriftserver module (since it should run with Spark dependencies). 
   
   We also seem to exclude everything for log4j2 as it conflicts with log4j 1:
   
   ```
             <!-- org.apache.logging.log4j:* conflict with log4j 1.2.17 -->
             <exclusion>
               <groupId>org.apache.logging.log4j</groupId>
               <artifactId>*</artifactId>
             </exclusion>
   ```
   
   so the code may need to be removed if it requires log4j2 either directly or indirectly (transitive dependency).

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