[HDFS-5118] Provide testing support for DFSClient to drop RPC responses

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Fix Version/s: 2.1.1-beta
• Hadoop Flags: Reviewed

Release Note

Used for testing when NameNode HA is enabled. Users can use a new configuration property "dfs.client.test.drop.namenode.response.number" to specify the number of responses that DFSClient will drop in each RPC call. This feature can help testing functionalities such as NameNode retry cache.

• Assignee: Jing Zhao
• Reporter: Jing Zhao
• Created: 21/Aug/13 01:51
• Updated: 12/May/16 18:18
• Resolved: 06/Sep/13 17:26

Description

We plan to add capability to DFSClient so that the client is able to intentionally drop responses of NameNode RPC calls according to settings in configuration. In this way we can do better system test for NameNode retry cache, especially when NN failover happens.