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During the development process, you need to use the yum command. Sometimes you will report the following error when executing yum

Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum
    Memory :  48 M RSS (443 MB VSZ)
    Started: Thu Mar 26 09:47:03 2020 - 00:23 ago
    State  : Running, pid: *****

Cause analysis: Yum can only support one routine. If one routine is already running, others must wait for the process to exit and release the lock. In this case,
can be restored with the following command:

rm -f /var/run/yum.pid

Record –