[SPARK-30225][core] Correct read() behavior past EOF in NioBufferedFileInputStream #27084
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…leInputStream. This bug manifested itself when another stream would potentially make a call to NioBufferedFileInputStream.read() after it had reached EOF in the wrapped stream. In that case, the refill() code would clear the output buffer the first time EOF was found, leaving it in a readable state for subsequent read() calls. If any of those calls were made, bad data would be returned. By flipping the buffer before returning, even in the EOF case, you get the correct behavior in subsequent calls. I picked that approach to avoid keeping more state in this class, although it means calling the underlying stream even after EOF (which is fine, but perhaps a little more expensive). This showed up (at least) when using encryption, because the commons-crypto StreamInput class does not track EOF internally, leaving it for the wrapped stream to behave correctly. Tested with added unit test + slightly modified test case attached to SPARK-18105.
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Test build #116056 has finished for PR 27084 at commit
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retest this please |
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Test build #116061 has finished for PR 27084 at commit
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HyukjinKwon
reviewed
Jan 3, 2020
| @@ -59,10 +59,10 @@ private boolean refill() throws IOException { | |||
| while (nRead == 0) { | |||
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nit: the comment says it checks the weather :-).
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Merged to master and branch-2.4. |
HyukjinKwon
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Jan 3, 2020
…leInputStream This bug manifested itself when another stream would potentially make a call to NioBufferedFileInputStream.read() after it had reached EOF in the wrapped stream. In that case, the refill() code would clear the output buffer the first time EOF was found, leaving it in a readable state for subsequent read() calls. If any of those calls were made, bad data would be returned. By flipping the buffer before returning, even in the EOF case, you get the correct behavior in subsequent calls. I picked that approach to avoid keeping more state in this class, although it means calling the underlying stream even after EOF (which is fine, but perhaps a little more expensive). This showed up (at least) when using encryption, because the commons-crypto StreamInput class does not track EOF internally, leaving it for the wrapped stream to behave correctly. Tested with added unit test + slightly modified test case attached to SPARK-18105. Closes #27084 from vanzin/SPARK-30225. Authored-by: Marcelo Vanzin <vanzin@cloudera.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org>
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This bug manifested itself when another stream would potentially make a call
to NioBufferedFileInputStream.read() after it had reached EOF in the wrapped
stream. In that case, the refill() code would clear the output buffer the
first time EOF was found, leaving it in a readable state for subsequent
read() calls. If any of those calls were made, bad data would be returned.
By flipping the buffer before returning, even in the EOF case, you get the
correct behavior in subsequent calls. I picked that approach to avoid keeping
more state in this class, although it means calling the underlying stream
even after EOF (which is fine, but perhaps a little more expensive).
This showed up (at least) when using encryption, because the commons-crypto
StreamInput class does not track EOF internally, leaving it for the wrapped
stream to behave correctly.
Tested with added unit test + slightly modified test case attached to SPARK-18105.