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

Sometimes you will encounter HDFS access exception. You can reinitialize HDFS at this time, but try not to initialize it too many times, and you'd better turn off Hadoop (stop-all.sh) before initialization, otherwise all the previous files will be deleted and the slave node process will fail.

1. Shut down the hadoop cluster. / stop-all.sh

Delete the folder rm-rf / usr/local/src/hadoop-1.2.1/tmp before initializing 2.hadoop

3. (optional) delete hadoop log rm-rf / usr/local/src/hadoop-1.2.1/logs

4.hadoop initializes. / hadoop namenode-format

5. Start the hadoop cluster. / start-all.sh

6. Visit HDFS. / hadoop fs-ls /

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