final class ChangeEnsembleCb implements StatCallback {
@Override
public void processResult(final int rc, String path, Object ctx, final Stat stat) {
bk.mainWorkerPool.submitOrdered(ledgerId, new SafeRunnable() {
@Override
public void safeRun() {
if (rc == KeeperException.Code.BadVersion) {
rereadMetadata(new GenericCallback<LedgerMetadata>() {
@Override