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This article introduces the knowledge of "what to do if Hadoop datanode cannot join the cluster". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

After formatting namenode, you can find that datanode did not start successfully through jps. If you look at the log / home/wukong/usr/hadoop-1.2.1/logs/hadoop-wukong-datanode-bd12.log on datanode, you can find that namespaceid is wrong.

Solution:

1. View the path of hadoop.tmp.dir parameters on namenode

Namespaceid in / usr/hadoop-tmp/dfs/name/current/VERSION

2. On other data nodes, the VERSION file namespaceid in the current folder under the path of modifying the dfs.data.dir configuration on the other data nodes is consistent with the name node.

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