Shulou(Shulou.com)06/03 Report--

1) modify the namespaceID of each Slave to be consistent with the namespaceID of Master.

Or

2) modify the namespaceID of Master to be consistent with the namespaceID of Slave.

The "namespaceID" is located in the "/ usr/hadoop/tmp/dfs/data/current/VERSION" file, and the blue one in front of it may change according to the actual situation, but the red in the back is the same.

For example: view the "VERSION" file under "Master"

View the error log to visit http://localhost:50070, click the Namenode logs link on the page, and click the hadoop-hadoop-datanode-ubuntu.log link on the logs page.

This prompt is found in the log: Invalid directory in dfs.data.dir: Incorrect permission for / usr/local/hadoop/hdfs/data, expected: rwxr-xr-x, while actual: rwxr-xrwx. The reason is the problem of data folder permissions. Execute: chmod GMurw / usr/local/hadoop/hdfs/data. After modifying the folder permissions, start Hadoop again to solve the problem.

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