Github user steveloughran commented on the issue:
    I'm going to recommend you file a SPARK bug on there & an 
HDFS linked to it "NPE in BlockReaderFactory log init". It looks like the 
creation of the LOG for BlockReader is triggering introspection which is 
triggering the BlockReaderFactory to do something before its fully inited, and 
then possibly NPE-ing as the LOG field is null.

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