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From "Thomas Marquardt (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15688) ABFS: InputStream wrapped in FSDataInputStream twice
Date Wed, 22 Aug 2018 21:35:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Thomas Marquardt updated HADOOP-15688:
    Attachment: HADOOP-15688-HADOOP-15407-002.patch

> ABFS: InputStream wrapped in FSDataInputStream twice
> ----------------------------------------------------
>                 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
>            Priority: Major
>         Attachments: HADOOP-15688-HADOOP-15407-002.patch, HADOOP-15688.001.patch
> 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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