[jira] [Created] (SPARK-21143) Fail to fetch blocks >1MB in size in presence of conflicting Netty version

["Ryan Williams (JIRA)" <ji...@apache.org>]

Ryan Williams created SPARK-21143:
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             Summary: Fail to fetch blocks >1MB in size in presence of conflicting Netty version
                 Key: SPARK-21143
                 URL: https://issues.apache.org/jira/browse/SPARK-21143
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.1.1
            Reporter: Ryan Williams
            Priority: Minor


One of my spark libraries inherited a transitive-dependency on Netty 4.1.6.Final (vs. Spark's 4.0.42.Final), and I observed a strange failure I wanted to document: fetches of blocks larger than 1MB (pre-compression, afaict) seem to trigger a code path that results in {{AbstractMethodError}}'s and ultimately stage failures.

I put a minimal repro in [this github repo|https://github.com/ryan-williams/spark-bugs/tree/netty]: {{collect}} on a 1-partition RDD with 1032 {{Array\[Byte\]}}'s of size 1000 works, but at 1033 {{Array}}'s it dies in a confusing way.

Not sure what fixing/mitigating this in Spark would look like, other than defensively shading+renaming netty.



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