How to clear local file cache and user cache for yarn

[#1]

To clear local file cache and user cache for yarn, perform the following:

1. Find out the cache location by checking the value of the yarn.nodemanager.local-dirs property :

   <property>       
   <name>yarn.nodemanager.local-dirs</name>       
   <value>/hadoop/yarn/local</value> 
   </property>

2. Remove filecache and usercache folder located inside the folders that is specified in yarn.nodemanager.local-dirs.

   [yarn@node2 ~]$ cd /hadoop/yarn/local/ 
   [yarn@node2 local]$ ls filecache  nmPrivate  spark_shuffle  usercache 
   [yarn@node2 local]$ rm -rf filecache/ usercache/

   If there are more than one folder, clean them one by one.
3. Restart YARN service.