Dhruve Ashar created SPARK-21181:
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Summary: Suppress memory leak errors reported by netty
Key: SPARK-21181
URL: https://issues.apache.org/jira/browse/SPARK-21181
Project: Spark
Issue Type: Bug
Components: Input/Output
Affects Versions: 2.1.0
Reporter: Dhruve Ashar
Priority: Minor
We are seeing netty report memory leak erros like the one below after switching
to 2.1.
{code}
ERROR ResourceLeakDetector: LEAK: ByteBuf.release() was not called before it's
garbage-collected. Enable advanced leak reporting to find out where the leak
occurred. To enable advanced leak reporting, specify the JVM option
'-Dio.netty.leakDetection.level=advanced' or call
ResourceLeakDetector.setLevel() See
http://netty.io/wiki/reference-counted-objects.html for more information.
{code}
Looking a bit deeper, Spark is not leaking any memory here, but it is confusing
for the user to see the error message in the driver logs.
After enabling, '-Dio.netty.leakDetection.level=advanced', netty reveals the
SparkSaslServer to be the source of these leaks.
Sample trace :https://gist.github.com/dhruve/b299ebc35aa0a185c244a0468927daf1
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