Usually, Exception: java.io.IOException: Exceeded MAX_FAILED_UNIQUE_FETCHES; bailing-out is caused by communication issues among Hadoop cluster nodes. To resolve this issue, check the following: a) Whether there are any communication problems among the Hadoop cluster nodes. b) Whether SSL certificate of any data node has expired (If Hadoop cluster is SSL enabled). c) If the SSL changes were made and services that are using the SSL is not restarted after the activity the issue will occur, need to restart the services in the cluster which are using the SSL.
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