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https://issues.apache.org/jira/browse/HDFS-16911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17703754#comment-17703754
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ASF GitHub Bot commented on HDFS-16911:
---------------------------------------
sadanand48 commented on code in PR #5364:
URL: https://github.com/apache/hadoop/pull/5364#discussion_r1145258696
##########
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/TestDistCpSync.java:
##########
@@ -1276,4 +1283,63 @@ private void snapshotDiffWithPaths(Path sourceFSPath,
verifyCopyByFs(sourceFS, targetFS, sourceFS.getFileStatus(sourceFSPath),
targetFS.getFileStatus(targetFSPath), false);
}
+
+ @Test
+ public void testSyncSnapshotDiffWithLocalFileSystem() throws Exception {
+ String[] args = new String[]{"-update", "-diff", "s1", "s2",
+ "file:///source", "file:///target"};
+ LambdaTestUtils.intercept(
+ IllegalArgumentException.class,
+ "The source file system file does not support snapshot",
+ () -> new DistCp(conf, OptionsParser.parse(args)).execute());
+ }
+
+ @Test
+ public void testSyncSnapshotDiffWithDummyFileSystem() throws Exception {
+ String[] args =
+ new String[] { "-update", "-diff", "s1", "s2", "dummy:///source",
+ "dummy:///target" };
+ try {
+ FileSystem dummyFs = FileSystem.get(URI.create("dummy:///"), conf);
+ Assert.assertTrue(dummyFs instanceof DummyFs);
+ new DistCp(conf, OptionsParser.parse(args)).execute();
+ } catch (Exception e) {
+ // can expect other exceptions as source and target paths
+ // are not created, assert if the exception is not arising
+ // due to the filesystem not supporting snapshots.
+ Assert.assertFalse(e.getMessage().contains("does not support snapshot"));
Review Comment:
After changing it to throw UnsupportedOperationException it became easier,
The failure scenario for this test case is only if it gets
UnsupportedException. It can expect other exceptions.
```java
catch (UnsupportedOperationException e) {
Assert.fail("Dummy FS supports snapshots," +
"did not expect UnsupportedOperationException");
} catch (Exception e) {
// can expect other exceptions as source and target paths
// are not created.
}
```
> Distcp with snapshot diff to support Ozone filesystem.
> ------------------------------------------------------
>
> Key: HDFS-16911
> URL: https://issues.apache.org/jira/browse/HDFS-16911
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: distcp
> Reporter: Sadanand Shenoy
> Priority: Major
> Labels: pull-request-available
>
> Currently in DistcpSync i.e the step which applies the diff b/w 2 provided
> snapshots as arguments to the distcp job with -diff option, only
> DistributedFilesystem and WebHDFS filesytems are supported.
>
> {code:java}
> // currently we require both the source and the target file system are
> // DistributedFileSystem or (S)WebHdfsFileSystem.
> if (!(srcFs instanceof DistributedFileSystem
> || srcFs instanceof WebHdfsFileSystem)) {
> throw new IllegalArgumentException("Unsupported source file system: "
> + srcFs.getScheme() + "://. " +
> "Supported file systems: hdfs://, webhdfs:// and swebhdfs://.");
> }
> if (!(tgtFs instanceof DistributedFileSystem
> || tgtFs instanceof WebHdfsFileSystem)) {
> throw new IllegalArgumentException("Unsupported target file system: "
> + tgtFs.getScheme() + "://. " +
> "Supported file systems: hdfs://, webhdfs:// and swebhdfs://.");
> }{code}
> As Ozone now supports snapshot feature after HDDS-6517, add support to use
> distcp with ozone snapshots.
>
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