Method undo

ZezeJava/ZezeJava/src/main/java/Zeze/Dbh2/CommitRocks.java:128–136

(long tid, BTransactionState.Data state)

	}

	private void undo(long tid, BTransactionState.Data state) {
		// undo
		var futures = new ArrayList<TaskCompletionSource<?>>();
		for (var e : state.getBuckets()) {
			futures.add(manager.openBucket(e).undoBatch(tid));
		}
		for (var e : futures)
			e.await();
	}

	private ArrayList<TaskCompletionSourceX<RaftRpc<BPrepareBatch.Data, BRefused.Data>>> processPrepareFutures(
			long tid, String queryHost, int queryPort,