Github user steveloughran commented on the issue: https://github.com/apache/spark/pull/17342 I'm going to recommend you file a SPARK bug on issues.apache.org 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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