pingcap/tidb

Add SQL diagnosis rule: threshold check for tikv_append_log_duration

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#17.941 aperta il 11 giu 2020

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Descrizione

Development Task

When Raft append log duration, P99 Value > 500ms, then append an warning in INSPECTION_RESULT table, this may be caused by:

  • write disk too slow, check the disk latency.
  • It may trigger the RocksDB Write Stall.

Refer

  • You can query the tikv_append_log_duration table to get metrics_schema.tikv_append_log_duration value. Here is the related doc.
  • You can refer the thresholdCheckInspection implementation in TiDB.

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