Phenomenon
When starting Hadoop, use jps to check the process, and the problem of Process information unavailable occurs, as follows
[root@vm8033 local]# jps 5700 -- process information unavailable 4853 -- process information unavailable 12773 Jps 11801 -- process information unavailable 5161 -- process information unavailable 4924 -- process information unavailable 5212 -- process information unavailable 11804 -- process information unavailable 2094 -- process information unavailable
There are basically two solutions
The first
1. Enter /tmp
2. Delete the hsperfdata_${username} folder in this directory
3. Execute jps again
the second
Make a soft connection or modify the permission hsperfdata_${username}.
The reason is the problem of permissions in the process of execution.