scanner_parallelism.json 489 B

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  1. {
  2. "type": "SQLOperator",
  3. "node_name": "HDFS_SCAN_NODE",
  4. "metric_names": [
  5. "AverageScannerThreadConcurrency",
  6. "LocalTime"
  7. ],
  8. "unit": 5,
  9. "rule": {
  10. "condition": "vars['IOBound']==False",
  11. "expr": "float(8 - vars['AverageScannerThreadConcurrency']) / 8.0 * vars['LocalTime']",
  12. "message": "Speed can be improved by that much if there's 8 scanner threads",
  13. "label": "Lack of scanner thread parallelism",
  14. "prio": 2
  15. },
  16. "fix": {
  17. "fixable": false
  18. }
  19. }