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https://issues.apache.org/jira/browse/HDFS-15916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17314506#comment-17314506
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Ayush Saxena commented on HDFS-15916:
-------------------------------------
Raised a PR, Going backward would have a couple of challenges, The snapshot
diff one should be solved by this.
HDFS-12920 might surface as well, at least it did for me, in that case remove
the time suffix from {{dfs.client.datanode-restart.timeout}}
In case you want to try, then try from below 3.3, from 3.3 and above, there
might be an error due to {{ClassNotFound}} for {{ProtobuffRpcEngine2}}
> 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
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> 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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