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org.apache.hadoop.fs.s3a.auth.NoAwsCredentialsException: IAMInstanceCredentialsProvider: Failed to load credentials from IMDS
This issue was introduced in EMR 6.15 by s3a connector issue: https://issues.apache.org/jira/browse/HADOOP-18945 issues with aws sdk v2 migration on hadoop are tracked here : https://issues.apache.org/jira/browse/HADOOP-18886
FileDownloadException: Failed to download file path: s3a://abc.log.parquet, range: 0-123414, partition values: [empty row], isDataPresent: false, eTag: null
could be the issue is with the parquet file, please validate this.
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