zhjwpku commented on a change in pull request #1670: HDFS-14925. Rename
operation should check nest snapshot
URL: https://github.com/apache/hadoop/pull/1670#discussion_r339301111
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirRenameOp.java
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@@ -574,7 +580,28 @@ private static void validateRenameSource(FSDirectory fsd,
}
// srcInode and its subtree cannot contain snapshottable directories with
// snapshots
- FSDirSnapshotOp.checkSnapshot(fsd, srcIIP, null);
+ FSDirSnapshotOp.checkSnapshot(fsd, srcIIP, snapshottableDirs);
+ }
+
+ private static void validateNestSnapshot(FSDirectory fsd, INodeDirectory
dstParent,
+ List<INodeDirectory> snapshottableDirs) throws SnapshotException {
+
+ if (fsd.getFSNamesystem().getSnapshotManager().isAllowNestedSnapshots()) {
+ return;
+ }
+
+ /*
+ * snapshottableDirs is a list of snapshottable directory(child of rename
src)
+ * which do not have snapshots yet. If this list is not empty, that means
rename
+ * src have snapshottable descendant directories.
Review comment:
If any of the descendants dirs got some snapshot,
`FSDirRenameOp#validateRenameSource` will finally call
`FSDirSnapshotOp#checkSnapshot` and throw `SnapshotException`. And this check
happens before this one.
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