运行jar包出现错误

hadoop@master word_count]$ hadoop jar word_count_class/wordcount.jar WordCount input_wordcount output_wordcount

Warning: $HADOOP_HOME is deprecated.

Exception in thread "main" java.io.IOException: 权限不够

at java.io.UnixFileSystem.createFileExclusively(Native Method)

at java.io.File.createTempFile(File.java:2024)

at org.apache.hadoop.util.RunJar.main(RunJar.java:119)

[hadoop@master word_count]$