[GitHub] [rocketmq] TerrellChen opened a new issue #1778: The data is not synchronized when a new node without data is added in dledger mode

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TerrellChen opened a new issue #1778: The data is not synchronized when a new node without data is added in dledger mode
URL: https://github.com/apache/rocketmq/issues/1778
 
 
   在一个已经搭建好且正常运行的3节点Deldger集群中，停止掉一台slave的进程，并且清空它的store/dledger_store目录后，再次重启进程，希望模拟为Dledger集群新增一个空节点的场景。
   而这个节点却始终没有数据同步过来。
   在master的broker_default.log日志中有相关异常，由io.openmessaging.storage.dledger.DLedgerEntryPusher.EntryDispatcher#doWork的try-catch块抛出
   `2020-02-16 18:22:24 ERROR EntryDispatcher-n0-n2 - [Push-n2]Error in EntryDispatcher-n0-n2 writeIndex=1435933765 compareIndex=-1
   io.openmessaging.storage.dledger.exception.DLedgerException: [code=410,name=INDEX_OUT_OF_RANGE,desc=] 1435933765 should between 1551149011-1815212110
           at io.openmessaging.storage.dledger.utils.PreConditions.check(PreConditions.java:41) ~[dledger-0.1.jar:na]
           at io.openmessaging.storage.dledger.store.file.DLedgerMmapFileStore.get(DLedgerMmapFileStore.java:479) ~[dledger-0.1.jar:na]
           at io.openmessaging.storage.dledger.DLedgerEntryPusher$EntryDispatcher.doAppendInner(DLedgerEntryPusher.java:389) ~[dledger-0.1.jar:na]
           at io.openmessaging.storage.dledger.DLedgerEntryPusher$EntryDispatcher.doAppend(DLedgerEntryPusher.java:464) ~[dledger-0.1.jar:na]
           at io.openmessaging.storage.dledger.DLedgerEntryPusher$EntryDispatcher.doWork(DLedgerEntryPusher.java:602) ~[dledger-0.1.jar:na]`
   在手动操作重启一次master后，数据同步又会正常进行。
   请问这个问题的原因是什么？以及为集群新增节点的正确操作是什么，有文档吗？

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