xinglin commented on code in PR #5071:
URL: https://github.com/apache/hadoop/pull/5071#discussion_r1003605800
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hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterClientProtocol.java:
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@@ -723,6 +723,49 @@ public boolean delete(String src, boolean recursive)
throws IOException {
}
}
+ // Create missing user home dirs for trash paths.
+ // We assume the router is running with super-user privilege (can create
+ // user home dir in /user dir).
+ private void createUserHomeForTrashPath(List<RemoteLocation> locations)
throws IOException {
+ List<RemoteLocation> missingUserHomes = new ArrayList<>();
+
+ // Identify missing trash roots
+ for(RemoteLocation loc: locations) {
+
+ String path = loc.getDest();
+ // Continue if not a trash path
+ if (!MountTableResolver.isTrashPath(path)) {
+ continue;
+ }
+
+ // Check whether user home dir exists at the destination namespace
+ String trashRoot = MountTableResolver.getTrashRoot();
+ String userHome = new Path(trashRoot).getParent().toUri().getPath();
+ RemoteLocation userHomeLoc = new RemoteLocation(loc, userHome);
+ RemoteMethod method = new RemoteMethod("getFileInfo", new Class<?>[]
{String.class}, new RemoteParam());
+ HdfsFileStatus ret = rpcClient.invokeSingle(userHomeLoc, method,
HdfsFileStatus.class);
+ if (ret == null) {
+ missingUserHomes.add(userHomeLoc);
+ }
+ }
+
+ if (!missingUserHomes.isEmpty()) {
Review Comment:
Hi @mkuchenbecker,
When missingUserHomes is empty, it means all user home dirs have been
created and thus we don't need to create user home dir anymore.
There is a for loop inside `invokeSequentialInternal`(), to loop over
locations. `invokeSequentialAsRouter`() will call `invokeSequentialInternal`().
I used invokeSequential, since I believe a trash path will mostly like live at
a single namenode.
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