pingcap/tidb

Improve observability of fast reorg ADD INDEX progress

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#56,986 建立於 2024年10月30日

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component/ddlgood first issuetype/enhancement

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描述

Enhancement

currently we only let progress forward when KV is written to TiKV. When fast reorg is enabled, data will be batched on disk for a long time. No progress will be made during that stage and some users may suspect DDL is stuck.

So I propose we draw another line in metrics, which means "how many record KV we have read to assume the index KV".

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