[HDFS-15916] DistCp: Backward compatibility: Distcp fails from Hadoop 3 to Hadoop 2 for snapshotdiff

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2.2
• Fix Version/s: 3.4.0, 3.3.2
• Component/s: distcp
• Labels: pull-request-available
• Target Version/s: 3.1.4, 3.4.0, 3.2.3, 3.3.2
• Hadoop Flags: Reviewed
• Assignee: Ayush Saxena
• Reporter: Srinivasu Majeti
• Created: 24/Mar/21 07:03
• Updated: 09/Jun/21 02:34
• Resolved: 08/Apr/21 16:00

Description

Looks like when using distcp diff options between two snapshots from a hadoop 3 cluster to hadoop 2 cluster , we get below exception and seems to be break backward compatibility due to new API introduction getSnapshotDiffReportListing.

 

hadoop distcp -diff s1 s2 -update src_cluster_path dst_cluster_path
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.RpcNoSuchMethodException): Unknown method getSnapshotDiffReportListing called on org.apache.hadoop.hdfs.protocol.ClientProtocol protocol
 

 

 

Issue Links

• relates to: HIVE-24852 Add support for Snapshots during external table replication
• links to: GitHub Pull Request #2863
• links to: GitHub Pull Request #3054
• links to: GitHub Pull Request #3056