[GitHub] [hadoop] xiaoyuyao commented on a change in pull request #942: HDDS-1587. Support dynamically adding delegated classes from to isolated class loader.

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xiaoyuyao commented on a change in pull request #942: HDDS-1587. Support dynamically adding delegated classes from to isolated class loader.
URL: https://github.com/apache/hadoop/pull/942#discussion_r292720912
 
 

 ##########
 File path: hadoop-ozone/common/src/main/bin/ozone-config.sh
 ##########
 @@ -49,3 +49,8 @@ else
   exit 1
 fi
 
+# HADOOP_OZONE_DELEGATED_CLASSES defines a list of classes which will be loaded by default
+# class loader of application instead of isolated class loader. With this way we can solve
+# incompatible problem when using hadoop3.x + ozone with older hadoop version.
+#export HADOOP_OZONE_DELEGATED_CLASSES=
 
 Review comment:
   Here we expose a environment variable but the code in FilteredClassLoader only load a system property. 

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