Josh Rosen created SPARK-22982:
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Summary: 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: 2.2.0, 2.1.0, 2.0.0, 1.6.0
Reporter: Josh Rosen
Assignee: Josh Rosen
Priority: Blocker
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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