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Posted to hdfs-dev@hadoop.apache.org by "Ayush Saxena (Jira)" <ji...@apache.org> on 2021/04/08 16:01:00 UTC
[jira] [Resolved] (HDFS-15916) DistCp: Backward compatibility:
Distcp fails from Hadoop 3 to Hadoop 2 for snapshotdiff
[ https://issues.apache.org/jira/browse/HDFS-15916?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ayush Saxena resolved HDFS-15916.
---------------------------------
Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
Committed to trunk.
Thanx [~weichiu] and [~vjasani] for the reviews, [~smajeti] for the report.
Cherry-picking has issues, due to HADOOP-17482, Will wait to see if that can be backported or raise a backport PR.
> DistCp: Backward compatibility: Distcp fails from Hadoop 3 to Hadoop 2 for snapshotdiff
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-15916
> URL: https://issues.apache.org/jira/browse/HDFS-15916
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: distcp
> Affects Versions: 3.2.2
> Reporter: Srinivasu Majeti
> Assignee: Ayush Saxena
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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.
>
> {code:java}
> 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
> {code}
>
>
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