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Posted to common-dev@hadoop.apache.org by "Sean Mackrory (JIRA)" <ji...@apache.org> on 2018/08/21 22:48:00 UTC

[jira] [Created] (HADOOP-15688) ABFS: InputStream wrapped in FSDataInputStream

Sean Mackrory created HADOOP-15688:
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             Summary: ABFS: InputStream wrapped in FSDataInputStream
                 Key: HADOOP-15688
                 URL: https://issues.apache.org/jira/browse/HADOOP-15688
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Sean Mackrory
            Assignee: Sean Mackrory


I can't read Parquet files from ABFS. It has 2 different implementations to read seekable streams, and it'll use the one that uses ByteBuffer reads if it can. It currently decides to use the ByteBuffer read implementation because the FSDataInputStream it gets back wraps another FSDataInputStream, which implements ByteBufferReadable.

That's not the most robust way to check that ByteBufferReads are supported by the ultimately underlying InputStream, but it's unnecessary and probably a mistake to double-wrap the InputStream, so let's not.



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