Namenode没有开始 [英] Namenode not getting started

问题描述

我在伪分布式模式下使用Hadoop，一切正常。但之后因为某种原因必须重新启动计算机。现在，当我尝试启动Namenode和Datanode时，我只能找到Datanode正在运行。有谁能告诉我这个问题的可能原因吗？或者我做错了什么？

我试过 bin / start-all.sh 和 bin / start-dfs.sh 。

解决方案

开始。我找到了一个解决方案，使用以下内容：

1. 首先从临时文件夹中删除所有内容： rm -Rf< tmp dir> ; （我是/ usr / local / hadoop / tmp）
   
2. 格式化namenode： bin / hadoop namenode -format
3. 再次启动所有进程： bin / start-all.sh

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您也可以考虑使用检查点回滚（如果启用了该检查点）。




I was using Hadoop in a pseudo-distributed mode and everything was working fine. But then I had to restart my computer because of some reason. And now when I am trying to start Namenode and Datanode I can find only Datanode running. Could anyone tell me the possible reason of this problem? Or am I doing something wrong?

I tried both bin/start-all.sh and bin/start-dfs.sh.

解决方案

I was facing the issue of namenode not starting. I found a solution using following:

1. first delete all contents from temporary folder: rm -Rf <tmp dir> (my was /usr/local/hadoop/tmp)
2. format the namenode: bin/hadoop namenode -format
3. start all processes again:bin/start-all.sh

You may consider rolling back as well using checkpoint (if you had it enabled).

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