Thanks for sharing the steps to resolve the issue. Yes, indeed every NN/DN in each cluster should have access to other cluster's node and vice-versa since the ExportSnapshot is more of the HDFS distcp operation where the majority of the work involves copying the HFiles (associated with the snapshot) in a distributed fashion from the source to target (similar to distcp). It would be helpful if you could share the complete stack trace of the exception which would also help to understand the flow during the failure. Again thanks for taking the time to post the solution.
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