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https://issues.apache.org/jira/browse/ARROW-6180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16906584#comment-16906584
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Wes McKinney commented on ARROW-6180:
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[~pitrou] the problem is that multiple threads are creating their own
{{BufferedInputStream}} that references different segments of a
{{RandomAccessFile}} that was passed into say {{ParquetFileReader}}
Suppose you have a file that's 100MB and contains 10 10MB chunks. And you have
different threads that do buffered processing of each chunk. If you naively
pass {{RandomAccessFile}} into {{BufferedInputStream}} in different threads
then the threads will clobber each other
> [C++] Create InputStream that references a segment of a RandomAccessFile
> ------------------------------------------------------------------------
>
> Key: ARROW-6180
> URL: https://issues.apache.org/jira/browse/ARROW-6180
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Assignee: Zherui Cao
> Priority: Major
>
> If different threads wants to do buffered reads over different portions of a
> file (and they are unable to create their own separate file handles), they
> may clobber each other. I would propose creating an object that keeps the
> RandomAccessFile internally and implements the InputStream API in a way that
> is safe from other threads changing the file position
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