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

1. View fsp_w_picpath image file

$hdfs oiv-I xxxImage-o xxx.xml-p XML

After export, put it into eclipse and format it with shift+ctrl+f and view it.

two。 View the edit_xxx edit log file

$hdfs oev-I xxx_edit-o xxx.xml-p XML

3.hadoop fs = hdfs dfs

4.$hdfs datanode

Run a datanode program in the foreground. If you want to put it from the foreground to the background, execute ctrl+z first.

Then the selected command can be called out with bg% jobnumber

% jobnumber is the sequence number (not pid) of the command being executed in the background found through the jobs command.

5. You need to add log4j.properties in windows programming

Find location: [{hadoop_home} / etc/hadoop/log4j.properties]

Put it into src/log4j.properties

6. Shut down the nodemanager and resourcemanager processes

Execute on datanode

$yarn-daemon.sh stop/start nodemanger

Execute on namenode

$yarn-daemon.sh stop/start resourcemanager

7. The foreground starts the balancer balancer

$hdfs balancer

8. Merge getmerge command

$hdfs dfs-getmerge-nl / user/ubuntu/data/hi.txt / user/ubuntu/data/hello.txt ~ / merge.txt

In fact, it merges two pieces of content and downloads them locally.

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