sijie commented on a change in pull request #1094: BP-27: New BookKeeper CLI 

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+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import com.beust.jcommander.Parameters;
+import java.util.List;
+import org.apache.bookkeeper.bookie.Journal;
+import org.apache.bookkeeper.bookie.LedgerDirsManager;
+import org.apache.bookkeeper.bookie.LogMark;
+import org.apache.bookkeeper.conf.ServerConfiguration;
+import org.apache.bookkeeper.util.DiskChecker;
+ * A bookie command to print the last log marker.
+ */
+@Parameters(commandDescription = "Print last log marker")
+public class LastMarkCommand extends BookieCommand {
 Review comment:
   > 1. it is definitely not obvious for the first time users
   users usually have a period to get used to a cli. is this a real concern?
   > 2. In the following line what does "bookie-shell" refer to? because when I 
tried "./bookkeeper-cli bookie-shell bookie" it doesn't output just "bookie" 
command usage.
   will change it to "bookkeeper-cli". is that clear to you?
   > 3. in the existing shell we have couple of options for commands - 
ledgeridformat and entryformat. It seems it is missing in the new CLI
   if you check the description, this is the first change for BP-27. I am 
setting up the skeleton and only port 3 commands, there will be subsequent 
changes to port individual commands.
   > 4. I'm concerned about flexibility with jcommander framework for commands 
with complicated options like 'readlog' command - (readlog [-msg] <entry_log_id 
| entry_log_file_name> [-ledgerid [-entryid ]] [-startpos [-endpos ]])
   why? jcommander is just a parser like commons-cli.
   if you ship this PR, I can port the `readlog` command in the next PR. 
otherwise we will keep stuck here and will never move.
   > 5. What is the expected output for the command "./bookkeeper-cli --help 
bookie" ? isn't it supposed to print help message just for bookie command?
   --help before "bookie" is printing the help usage of "./bookkeeper-cli". I 
will have a subsequent change for supporting './bookkeeper-cli help bookie'. 

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