Hadoop save “parquet” error OutOfMemoryError: PermGen space

This may be caused by many reasons, the following is solution for the one that I faced

Set max perm size
```
-Xms256m -Xmx1024m -XX:PermSize=512m -XX:MaxPermSize=512m
```
You should modify the value as long as suitable for your situation
Using higher jdk version
In this case I update my jdk version to 8

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