[jira] [Created] (SPARK-21181) Suppress memory leak errors reported by netty

["Dhruve Ashar (JIRA)" <ji...@apache.org>]

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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