[HADOOP-16518] Updating incompatible issue

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.8.5, 3.1.2
• Component/s: io
• Labels: performance
• Assignee: Unassigned
• Reporter: xia0c
• Created: 16/Aug/19 22:14
• Updated: 16/Aug/19 22:14

Description

Hi,

The following code snippets throw an incompatible issue when I try to rolling update Hadoop Common from 2.7.7 to 3.X. The Hadoop-hdfs version is 2.7.1.

@Test
public void Test(){
	RetryPolicy retryPolicy =
            RetryUtils.getDefaultRetryPolicy(
            		conf,
                    DFSConfigKeys.DFS_HTTP_CLIENT_RETRY_POLICY_ENABLED_KEY,
                    DFSConfigKeys.DFS_HTTP_CLIENT_RETRY_POLICY_ENABLED_DEFAULT,
                    DFSConfigKeys.DFS_HTTP_CLIENT_RETRY_POLICY_SPEC_KEY,
                    DFSConfigKeys.DFS_HTTP_CLIENT_RETRY_POLICY_SPEC_DEFAULT,
                    SafeModeException.class);
}

It throws an error: incompatible types: java.lang.Class<org.apache.hadoop.hdfs.server.namenode.SafeModeException> cannot be converted to java.lang.String

Thanks a lot.