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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