Sounds like a network issue, for example connecting to remote server?
try
ping 172.21.242.26
telnet 172.21.242.26 596590
or nc -vz 172.21.242.26 596590
example
nc -vz rhes76 1521
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to 50.140.197.230:1521.
Ncat: 0 bytes sent, 0 bytes rece
i want to use yarn cluster with my current code. if i use
conf.set("spark.master","local[*]") inplace of
conf.set("spark.master","yarn"), everything is very well. but i try to use
yarn in setmaster, my code give an below error.
```
package com.example.pocsparkspring;
import org.apache.hadoop.con
