v21.1.0-rc.1 release notes (#10481)

* v21.1.0-rc.1 release notes

_config_base.yml

@@ -79,10 +79,10 @@ release_info:
     start_time: 2021-04-23 11:01:26.34274101 +0000 UTC
     version: v20.2.8
   v21.1:
-    build_time: 2021/4/29 11:00:26 (go1.15.5)
+    build_time: 2021/5/5 11:00:26 (go1.15.5)
     docker_image: cockroachdb/cockroach-unstable
     name: v21.1.0
-    start_time: 2021-4-29 11:01:26.34274101 +0000 UTC
-    version: v21.1.0-beta.5
+    start_time: 2021-5-5 11:01:26.34274101 +0000 UTC
+    version: v21.1.0-rc.1
 site_title: CockroachDB Docs
 url: https://www.cockroachlabs.com

_data/releases.yml

@@ -229,6 +229,8 @@
       no_windows: true
 - title: Testing releases
   releases:
+    - date: May 5, 2021
+      version: v21.1.0-rc.1
     - date: Apr 29, 2021
       version: v21.1.0-beta.5
     - date: Apr 19, 2021

_includes/sidebar-releases.json

@@ -78,7 +78,8 @@
         "/releases/v21.1.0-beta.2.html",
         "/releases/v21.1.0-beta.3.html",
         "/releases/v21.1.0-beta.4.html",
-        "/releases/v21.1.0-beta.5.html"
+        "/releases/v21.1.0-beta.5.html",
+        "/releases/v21.1.0-rc.1.html"
       ]
     },
     {

releases/v21.1.0-rc.1.md

@@ -0,0 +1,65 @@
+---
+title: What's New in v21.1.0-rc.1
+toc: true
+summary: Additions and changes in CockroachDB version v21.1.0-rc.1 since version v21.1.0-beta.5
+---
+
+## May 05, 2021
+
+Get future release notes emailed to you:
+
+{% include marketo.html %}
+
+
+### Downloads
+
+<div id="os-tabs" class="filters clearfix">
+    <a href="https://binaries.cockroachdb.com/cockroach-v21.1.0-rc.1.linux-amd64.tgz"><button id="linux" class="filter-button" data-scope="linux" data-eventcategory="linux-binary-release-notes">Linux</button></a>
+    <a href="https://binaries.cockroachdb.com/cockroach-v21.1.0-rc.1.darwin-10.9-amd64.tgz"><button id="mac" class="filter-button" data-scope="mac" data-eventcategory="mac-binary-release-notes">Mac</button></a>
+    <a href="https://binaries.cockroachdb.com/cockroach-v21.1.0-rc.1.windows-6.2-amd64.zip"><button id="windows" class="filter-button" data-scope="windows" data-eventcategory="windows-binary-release-notes">Windows</button></a>
+    <a href="https://binaries.cockroachdb.com/cockroach-v21.1.0-rc.1.src.tgz"><button id="source" class="filter-button" data-scope="source" data-eventcategory="source-release-notes"></a>
+</div>
+
+<section class="filter-content" data-scope="windows">
+{% include windows_warning.md %}
+</section>
+
+### Docker image
+
+{% include copy-clipboard.html %}
+~~~shell
+$ docker pull cockroachdb/cockroach-unstable:v21.1.0-rc.1
+~~~
+
+
+### SQL language changes
+
+- CockroachDB no longer allows [`ADD REGION`](../v21.1/add-region.html) or `DROP REGION` statements if a [`REGIONAL BY ROW`](../v21.1/multiregion-overview.html) table has index changes underway, or if a table is transitioning to or from `REGIONAL BY ROW`. [#64255][#64255]
+- CockroachDB now prevents index modification on `REGIONAL BY ROW` tables and locality to or from `REGIONAL BY ROW` changes while an `ADD REGION` or `DROP REGION` statement is being executed. [#64255][#64255]
+
+### Bug fixes
+
+- Fixed a scenario in which a rapid sequence of [range splits](../v21.1/architecture/distribution-layer.html#range-splits) could trigger a storm of [Raft snapshots](../v21.1/architecture/replication-layer.html#snapshots). This would be accompanied by log messages of the form "would have dropped incoming MsgApp, but allowing due to ..." and tended to occur as part of [`RESTORE`](../v21.1/restore.html)/[`IMPORT`](../v21.1/import.html) operations. [#64202][#64202]
+- Read-write contention on [`GLOBAL` tables](../v21.1/multiregion-overview.html) no longer has a potential to thrash without making progress. [#64215][#64215]
+- Previously, if a [`DROP INDEX`](../v21.1/drop-index.html) failed during a `REGIONAL BY ROW` transition, the index could have been re-inserted back into the `REGIONAL BY ROW` table but would be invalid if it was [hash-sharded](../v21.1/hash-sharded-indexes.html) or [partitioned](../v21.1/multiregion-overview.html). This bug is now fixed. [#64255][#64255]
+- Fixed a rare bug present in [v21.1 beta versions](index.html#testing-releases) that could cause rapid range splits and merges on a `GLOBAL` table to lead to a stuck leaseholder replica. The situation is no longer possible. [#64304][#64304]
+- Fixed a bug in previous v21.1 beta versions that allowed the store rebalancer to spuriously down-replicate a range during normal operation. [#64303][#64303]
+- CockroachDB now prevents some out-of-memory conditions caused by [schema change](../v21.1/online-schema-changes.html) validations concurrent with other high-memory-use queries. [#64307][#64307]
+- Fixed a bug present since [v21.1.0-alpha.1](v21.1.0-alpha.1.html) that could cause cascading [`DELETE`](../v21.1/delete.html)s with [subqueries](../v21.1/subqueries.html) to error. [#64278][#64278]
+- Fixed a bug that caused store information to be incorrectly redacted from the [CockroachDB logs](../v21.1/debug-and-error-logs.html), when logging was configured with redaction. [#64338][#64338]
+- Previously, the remote flows of execution in the [vectorized engine](../v21.1/vectorized-execution.html) could take a long time to shut down if a node participating in the plan died. This bug is now fixed. [#64219][#64219]
+
+### Contributors
+
+This release includes 14 merged PRs by 14 authors.
+
+[#64202]: https://github.com/cockroachdb/cockroach/pull/64202
+[#64215]: https://github.com/cockroachdb/cockroach/pull/64215
+[#64219]: https://github.com/cockroachdb/cockroach/pull/64219
+[#64255]: https://github.com/cockroachdb/cockroach/pull/64255
+[#64278]: https://github.com/cockroachdb/cockroach/pull/64278
+[#64303]: https://github.com/cockroachdb/cockroach/pull/64303
+[#64304]: https://github.com/cockroachdb/cockroach/pull/64304
+[#64307]: https://github.com/cockroachdb/cockroach/pull/64307
+[#64338]: https://github.com/cockroachdb/cockroach/pull/64338
+