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v20.0.0 release notes (#16273)
Signed-off-by: Shlomi Noach <[email protected]>
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@@ -29,6 +29,9 @@ | |
| - [Delete with Multi Target Support](#delete-multi-target) | ||
| - [User Defined Functions Support](#udf-support) | ||
| - [Insert Row Alias Support](#insert-row-alias-support) | ||
| - **[VReplication](#vreplication)** | ||
| - [Multi-tenant Imports](#multi-tenant) | ||
| - [VDiff Support For OnlineDDL Migrations](#vdiff-online-ddl) | ||
| - **[Query Timeout](#query-timeout)** | ||
| - **[Flag changes](#flag-changes)** | ||
| - [`pprof-http` default change](#pprof-http-default) | ||
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@@ -238,37 +241,45 @@ Support is added for sharded update with limit. | |
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| Example: `update t1 set t1.foo = 'abc', t1.bar = 23 where t1.baz > 5 limit 1` | ||
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| More details about how it works is available in [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/update.html) | ||
| The support is built on performing a selection of primary keys and then performing an update with those primary keys. | ||
| For query syntax, refer to the [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/update.html) | ||
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| #### <a id="multi-table-update"/> Update with Multi Table Support | ||
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| Support is added for sharded multi-table update with column update on single target table using multiple table join. | ||
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| Example: `update t1 join t2 on t1.id = t2.id join t3 on t1.col = t3.col set t1.baz = 'abc', t1.apa = 23 where t3.foo = 5 and t2.bar = 7` | ||
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| More details about how it works is available in [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/update.html) | ||
| The support is built on performing a selection of primary keys and then performing an update with those primary keys. | ||
| For query syntax, refer to the [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/update.html) | ||
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| #### <a id="update-multi-target"/> Update with Multi Target Support | ||
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| Support is added for sharded multi table target update. | ||
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| Example: `update t1 join t2 on t1.id = t2.id set t1.foo = 'abc', t2.bar = 23` | ||
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| More details about how it works is available in [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/update.html) | ||
| The support is built on performing a selection of primary keys from all target tables and | ||
| then performing an update for each table with their selected primary keys. | ||
| For query syntax, refer to the [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/update.html) | ||
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| #### <a id="delete-subquery"/> Delete with Subquery Support | ||
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| Support is added for sharded table delete with subquery | ||
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| Example: `delete from t1 where id in (select col from t2 where foo = 32 and bar = 43)` | ||
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| The support is built by performing the uncorrelated subquery first and then providing the value for deletion. | ||
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| #### <a id="delete-multi-target"/> Delete with Multi Target Support | ||
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| Support is added for sharded multi table target delete. | ||
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| Example: `delete t1, t3 from t1 join t2 on t1.id = t2.id join t3 on t1.col = t3.col` | ||
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| More details about how it works is available in [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/delete.html) | ||
| The support is built on performing a selection of primary keys from all target tables and | ||
| then performing a delete operation for each table with their selected primary keys. | ||
| For query syntax, refer to the [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/delete.html) | ||
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| #### <a id="udf-support"/> User Defined Functions Support | ||
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@@ -289,7 +300,7 @@ Example: | |
| - `insert into user(id, name, email) valies (100, 'Alice', '[email protected]') as new on duplicate key update name = new.name, email = new.email` | ||
| - `insert into user(id, name, email) valies (100, 'Alice', '[email protected]') as new(m, n, p) on duplicate key update name = n, email = p` | ||
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| More details about how it works is available in [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html) | ||
| For query syntax, refer to the [MySQL Docs](https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html) | ||
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| ### <a id="query-timeout"/>Query Timeout | ||
| On a query timeout, Vitess closed the connection using the `kill connection` statement. This leads to connection churn | ||
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@@ -328,6 +339,19 @@ The new flag `--querylog-sample-rate float` adds support for sampling queries ba | |
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| The new flag `--tablet-filter-tags StringMap` adds support to VTGate for filtering tablets by tablet tag key/values, specified as comma-separated list of key:values. The tags of a tablet are defined by the VTTablet flag `--init_tags`, which is also defined as a comma-separated list of key:values. | ||
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| ### <a id="vreplication"/>VReplication | ||
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| #### <a id="multi-tenant"/> Multi-tenant Imports | ||
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| Support for multi-tenant imports has been added to `MoveTables`. If you have a multi-tenant architecture where each | ||
| tenant has their own database, you can import the tenants using multiple `MoveTables` workfows, one per tenant. | ||
| Each import is initiated with the new `--tenant-id` flag. The column name (and data type) need to be specified in | ||
| the VSchema of the target keyspace. | ||
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| #### <a id="vdiff-online-ddl"/> VDiff support for OnlineDDL migrations | ||
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| You can now run `VDiff`s on OnlineDDL schema change migrations, which are not yet cut over. | ||
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| ## <a id="minor-changes"/>Minor Changes | ||
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| ### <a id="new-stats"/>New Stats | ||
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@@ -363,7 +387,7 @@ The vtadmin-web UI no longer has a dependency on highcharts for licensing reason | |
| ------------ | ||
| The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/changelog/20.0/20.0.0/changelog.md). | ||
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| The release includes 441 merged Pull Requests. | ||
| The release includes 419 merged Pull Requests. | ||
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| Thanks to all our contributors: @Aoang, @Ari1009, @GuptaManan100, @Its-Maniaco, @Maniktherana, @VaibhavMalik4187, @ajm188, @aparajon, @app/dependabot, @app/github-actions, @app/vitess-bot, @arthurschreiber, @bddicken, @beingnoble03, @brendar, @crazeteam, @dbussink, @deepthi, @demmer, @derekperkins, @ejortegau, @frouioui, @harshit-gangal, @mattlord, @maxenglander, @mdlayher, @notfelineit, @pavedroad, @rafer, @rohit-nayak-ps, @rvrangel, @shlomi-noach, @systay, @timvaillancourt, @tycol7, @vitess-bot, @vmg, @wangweicugw, @whuang8, @yoheimuta | ||
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