Dieter De Paepe created HADOOP-18988:
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Summary: Snapshotdiff does not detect rename if parent dir removed
Key: HADOOP-18988
URL: https://issues.apache.org/jira/browse/HADOOP-18988
Project: Hadoop Common
Issue Type: Bug
Components: fs
Affects Versions: 3.3.6
Reporter: Dieter De Paepe
In the example case below, the diff reports the moved folder as a CREATE, where
it should be a RENAME.
This means that applications using the diff report (such as DistCP) will have
to transfer data where a simple move would suffice.
{code:java}
DistributedFileSystem fs = (DistributedFileSystem) this.fs;
createHdfsFile(new Path("/level1/level2/file"), "content");
fs.allowSnapshot(new Path("/"));
fs.createSnapshot(new Path("/"), "snapshot1");
fs.rename(new Path("/level1/level2/"), new Path("/level2-root"));
fs.delete(new Path("/level1"), true);
fs.createSnapshot(new Path("/"), "snapshot2");
SnapshotDiffReport snapshotDiff =
fs.getSnapshotDiffReport(new Path("/"), "snapshot1", "snapshot2");
System.out.println(snapshotDiff);
// Difference between snapshot snapshot1 and snapshot snapshot2 under
directory /:
// M .
// + ./level2-root
// - ./level1
// If the delete is commented out:
// M .
// M ./level1
// R ./level1/level2 -> ./level2-root{code}
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