Detailed explanation of JPS

Hello everyone , I meet you again , I'm your friend, Quan Jun .

First jps Directory in java in , As shown in the figure below .jps It is mainly used to view java process , In the view hdfs Can replace ps -ef | grep hdfs command .

In the discussion jps when , We can switch users to root Under the user , then jps Check the process , There will be the following problems , As shown in the figure below , Display process information is not available （process information unavailale）

In the enterprise , If the process is not available , First use ps -ef | grep pid Check to see if the process exists .

• If the process exists , As shown in the figure below , It shows yes hadoop This user's process , So we can try to switch users to view （ Do not kill 了 , Otherwise, colleagues will rebel o(╥﹏╥)o）.

• If the process does not exist , And there is residual information , We can switch to /tmp Folder to view .

cd /tmp

Copy

PS: Our main concern is hsperfdata Prefixed folder , Get into hsperfdata_hadoop The folder can be seen in the following figure .

so , Want to completely delete the residual process , Just delete the process file .

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