Shixiong Zhu created SPARK-20547:
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Summary: ExecutorClassLoader's findClass may not work correctly
when a task is cancelled.
Key: SPARK-20547
URL: https://issues.apache.org/jira/browse/SPARK-20547
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 2.1.0
Reporter: Shixiong Zhu
ExecutorClassLoader's findClass may throw some transient exception. For
example, when a task is cancelled, if ExecutorClassLoader is running, you may
see InterruptedException or IOException, even if this class can be loaded. Then
the result of findClass will be cached by JVM, and later when the same class is
being loaded (note: in this case, this class may be still loadable), it will
just throw NoClassDefFoundError.
We should make ExecutorClassLoader's retry on transient exceptions.
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