[jira] [Created] (KUDU-3157) kudu-spark2 jar is now including slf4j classes

["Jeff Evans (Jira)" <ji...@apache.org>]

Jeff Evans created KUDU-3157:
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             Summary: kudu-spark2 jar is now including slf4j classes
                 Key: KUDU-3157
                 URL: https://issues.apache.org/jira/browse/KUDU-3157
             Project: Kudu
          Issue Type: Bug
          Components: spark
    Affects Versions: 1.12.0
            Reporter: Jeff Evans


It seems that sometime between versions {{1.7.0}} and {{1.12.0}} of {{org.apache.kudu:kudu-spark2_2.11}}, some SLF4J classes started begin included.

These should be removed from the jar, or at least relocated so as not to clash with Spark vendor dependencies, which can cause {{LinkageError}} in Spark clusters.  Real life example of this problem, seen on a Spark job started on CDH 6.3 cluster:

{code}
Exception in thread "main" java.lang.LinkageError: loader constraint violation: when resolving method "org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()Lorg/slf4j/ILoggerFactory;" the class loader (instance of org/apache/spark/util/ChildFirstURLClassLoader) of the current class, org/slf4j/LoggerFactory, and the class loader (instance of sun/misc/Launcher$AppClassLoader) for the method\'s defining class, org/slf4j/impl/StaticLoggerBinder, have different Class objects for the type org/slf4j/ILoggerFactory used in the signature
        at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:423)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:362)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:388)
{code}



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