{ "type": "SQLOperator", "node_name": "HDFS_SCAN_NODE", "metric_names": [ "RowsRead", "ScannerThreadsUserTime", "ScannerThreadsSysTime", "AverageScannerThreadConcurrency" ], "unit": 5, "rule": { "expr": "(vars['ScannerThreadsUserTime'] + vars['ScannerThreadsSysTime'] - vars['RowsRead'] * 100) / max(1,vars['AverageScannerThreadConcurrency'])", "message": "Predicates might be expensive (expectes speed 10m rows per sec per core)", "label": "Slow HDFS Scan" }, "fix": { "fixable": false } }