liuml07 commented on a change in pull request #1761: HADOOP-16759. Filesystem
openFile() builder to take a FileStatus param
URL: https://github.com/apache/hadoop/pull/1761#discussion_r359123606
##########
File path:
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3ARemoteFileChanged.java
##########
@@ -432,6 +433,42 @@ public void testReadFileChangedOutOfSyncMetadata() throws
Throwable {
}
}
+ /**
+ * Verifies that when the openFile builder is passed in a status,
+ * then that is used to eliminate the getFileStatus call in open();
+ * thus the version and etag passed down are still used.
+ */
+ @Test
+ public void testOpenFileWithStatus() throws Throwable {
+ final Path testpath = path("testOpenFileWithStatus.dat");
+ final byte[] dataset = TEST_DATA_BYTES;
+ S3AFileStatus originalStatus =
+ writeFile(testpath, dataset, dataset.length, true);
+
+ // forge a file status with a different tag
+ S3AFileStatus forgedStatus =
+ S3AFileStatus.fromFileStatus(originalStatus, Tristate.FALSE,
+ originalStatus.getETag() + "-fake",
+ originalStatus.getVersionId() + "");
+ fs.getMetadataStore().put(
+ new PathMetadata(forgedStatus, Tristate.FALSE, false));
+
+ // By passing in the status open() doesn't need to check s3guard
+ // And hence the existing file is opened
+ try (FSDataInputStream instream = fs.openFile(testpath)
+ .withFileStatus(originalStatus)
+ .build().get()) {
+ instream.read();
+ }
+
+ // and this holds for S3A Located Status
+ try (FSDataInputStream instream = fs.openFile(testpath)
+ .withFileStatus(new S3ALocatedFileStatus(originalStatus, null))
+ .build().get()) {
+ instream.read();
+ }
+ }
Review comment:
The two try-with tests are testing that with a good FileStatus passed, it's
able to skip the S3Guard and hence no errors are reported regardless of change
detection policy.
I was thinking is it worth to make sure if we pass the wrong file status, it
will error out because S3Guard is tested to have bad state. For e.g.
```
try(FSDataInputStream instream = fs.openFile(testpath)
.build().get()) {
try {
instream.read();
// No exception only if we don't enforce change detection as exception
assertTrue(changeDetectionMode.equals(CHANGE_DETECT_MODE_NONE) ||
changeDetectionMode.equals(CHANGE_DETECT_MODE_WARN));
} catch (Exception ignored) {
// Ignored.
}
}
```
I think again and now guess this extra test perhaps is not required to
demonstrate the withFileStatus is being honored.
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