You are copying data from Parquet format in Azure Data Factory using Self-hosted Integration Runtime and you get the following error: 
<pre>An error occurred when invoking java, message: java.lang.OutOfMemoryError:Java heap space</pre>
How will you resolve this error?

Answer options:

A.Remove the environment variable _JAVA_OPTIONS and rerun the pipeline
B.Add an environment variable _JAVA_OPTIONS and rerun the pipeline
C.Restart the machine
D.You can’t copy the data from Parquet format in Azure Data Factory

Correct Answer: B 
While copying the data from or to Parquet format using Self-hosted Integration Runtime(IR), you might get the error stating "An error occurred when invoking java, message: java.lang.OutOfMemoryError:Java heap space". This error can be resolved by adding an environment variable _JAVA_OPTIONS in the machine hosting the Self-hosted Integrated Runtime to adjust the max/min heap size for JVM to allow such copy and rerun the pipeline. 

Option A is incorrect. You need to add the environment variable _JAVA_OPTIONS and rerun the pipeline to resolve the issue.
Option B is correct. You need to add the environment variable _JAVA_OPTIONS and rerun the pipeline to resolve the issue.
Option C is incorrect. Only restarting the machine won’t solve the issue.
Option D is incorrect. Azure Data Factory allows copying data from/to Parquet format.
Reference: 
To know more about Parquet format in Azure Data Factory, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/data-factory/format-parquet