CONTAP-46911:高負荷が原因で大規模なRDBの読み取りレイテンシが高くなることがある
問題
- When a replicated database (RDB) instance experiences below, it can cause RDB read latencies to begin increasing over time.
- A volume of high concurrent read requests generated from external and/or internal workflows for an extended period of time(hours on end)
- This is combined with frequent writes (transactions)
- This can eventually lead to various management operations and commands timing out.
- If this issue affects the volume location database (VLDB), it can affect data volume access causing NFS protocol delays and timeouts.
- Additionally, such a high rate of concurrent read requests and ongoing transactions can result in the database journal file, rdb.db-wal, to grow large in size (that is, hundreds of megabytes or even several gigabytes).
- In turn, this might lead to affected management processes going in and out of quorum, re-joining quorum taking extra time, and longer than normal process startup times.