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Support load-based replica read #41664

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sticnarf opened this issue Feb 22, 2023 · 0 comments · Fixed by #40742
Closed

Support load-based replica read #41664

sticnarf opened this issue Feb 22, 2023 · 0 comments · Fixed by #40742
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type/enhancement The issue or PR belongs to an enhancement.

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@sticnarf
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Enhancement

See tikv/rfcs#105 for the TiKV design doc.

To support this feature in TiDB, add a session and global sysvar tidb_load_based_replica_read_threshold.

If the estimated waiting duration at TiKV exceeds the threshold, replica read is automatically enabled.
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copr: support load_based_replica_read_threshold sticnarf/tidb
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