public void exec(int depth, int concurrencyDepth, AlluxioURI path) throws Exception {
if (depth < 1) {
return;
} else if (depth == 1 || (depth < mDepth && path.hashCode() % 10 < 3)) {
// Sometimes we want to try renaming a path when we're not all the way down, which is what
// the second condition is for. We have to create the path in the destination up till what
// we're renaming. This might already exist, so createFile could throw a
// FileAlreadyExistsException, which we silently handle.
AlluxioURI srcPath = mRootPath.join(path);
AlluxioURI dstPath = mRootPath2.join(path);
long fileId = mFsMaster.getFileId(srcPath);
try {
CreateDirectoryOptions options = CreateDirectoryOptions.defaults().setRecursive(true);
mFsMaster.createDirectory(dstPath.getParent(), options);
} catch (FileAlreadyExistsException e) {
// This is an acceptable exception to get, since we don't know if the parent has been
// created yet by another thread.
} catch (InvalidPathException e) {
// This could happen if we are renaming something that's a child of the root.
}
mFsMaster.rename(srcPath, dstPath);
Assert.assertEquals(fileId, mFsMaster.getFileId(dstPath));
} else if (concurrencyDepth > 0) {
ExecutorService executor = Executors.newCachedThreadPool();
try {
ArrayList<Future<Void>> futures = new ArrayList<Future<Void>>(FILES_PER_NODE);
for (int i = 0; i < FILES_PER_NODE; i++) {
Callable<Void> call =
(new ConcurrentRenamer(
depth - 1,
concurrencyDepth - 1,
mRootPath,
mRootPath2,
path.join(Integer.toString(i))));
futures.add(executor.submit(call));
}
for (Future<Void> f : futures) {
f.get();
}
} finally {
executor.shutdown();
}
} else {
for (int i = 0; i < FILES_PER_NODE; i++) {
exec(depth - 1, concurrencyDepth, path.join(Integer.toString(i)));
}
}
}
