kv: introduce non-blocking ranges zone configs #57689
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A-kv-transactions
Relating to MVCC and the transactional model.
A-multiregion
Related to multi-region
C-enhancement
Solution expected to add code/behavior + preserve backward-compat (pg compat issues are exception)
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nvanbenschoten
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Jan 22, 2021
Closes cockroachdb#57689. This commit adds a new non_blocking_txns field to the ZoneConfig struct. non_blocking_txns specifies whether transactions operating on the range(s) should be configured to provide non-blocking behavior, meaning that reads can be served consistently from all replicas and do not block on writes. In exchange, writes get pushed into the future and must wait on commit to ensure linearizability. For more, see: https://github.com/cockroachdb/cockroach/blob/master/docs/RFCS/20200811_non_blocking_txns.md Release note: None
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Jan 27, 2021
59304: config/sql: add global_reads field to ZoneConfig, use for GLOBAL tables r=ajstorm a=nvanbenschoten Closes #57689. This PR adds a new `global_reads` field to the `ZoneConfig` struct. `global_reads` specifies whether transactions operating over the range(s) should be configured to provide non-blocking behavior, meaning that reads can be served consistently from all replicas and do not block on writes. In exchange, writes get pushed into the future and must wait on commit to ensure linearizability. For more, see: https://github.com/cockroachdb/cockroach/blob/master/docs/RFCS/20200811_non_blocking_txns.md The PR then enables `global_reads` for tables with the `GLOBAL` locality config. `global_reads` are not yet hooked up in KV because we don't yet have per-range closed timestamp tracking, but this completes the SQL-level work for GLOBAL tables, with the exception of #57663, which will add non-voting replicas (at the database zone config level) for all database regions that don't already have a voting replica. Release note (sql change): A new, unused field called "global_reads" was added to zone configurations. The field does not yet have any effect. Co-authored-by: Nathan VanBenschoten <[email protected]>
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Needed for non-blocking transactions: #52745.
Introduce a new
non_blocking_rangeboolean attribute to zone configs. Will configure a range's leaseholder to close times out in advance of present time. See the RFC for details.The text was updated successfully, but these errors were encountered: