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https://issues.apache.org/jira/browse/SPARK-22982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320203#comment-16320203
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Sean Owen commented on SPARK-22982:
-----------------------------------
Does this affect earlier branches in the same way? Seems important to back port
if so.
> Remove unsafe asynchronous close() call from FileDownloadChannel
> ----------------------------------------------------------------
>
> Key: SPARK-22982
> URL: https://issues.apache.org/jira/browse/SPARK-22982
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.6.0, 2.0.0, 2.1.0, 2.2.0
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Blocker
> Labels: correctness
> Fix For: 2.3.0
>
>
> Spark's Netty-based file transfer code contains an asynchronous IO bug which
> may lead to incorrect query results.
> At a high-level, the problem is that an unsafe asynchronous `close()` of a
> pipe's source channel creates a race condition where file transfer code
> closes a file descriptor then attempts to read from it. If the closed file
> descriptor's number has been reused by an `open()` call then this invalid
> read may cause unrelated file operations to return incorrect results due to
> reading different data than intended.
> I have a small, surgical fix for this bug and will submit a PR with more
> description on the specific race condition / underlying bug.
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