{ "type": "SQLOperator", "node_name": "HDFS_SCAN_NODE", "metric_names": [ "AverageScannerThreadConcurrency", "LocalTime" ], "unit": 5, "rule": { "condition": "vars['IOBound']==False", "expr": "float(8 - vars['AverageScannerThreadConcurrency']) / 8.0 * vars['LocalTime']", "message": "Speed can be improved by that much if there's 8 scanner threads", "label": "Lack of scanner thread parallelism", "prio": 2 }, "fix": { "fixable": false } }