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[GitHub] [couchdb-documentation] wohali opened a new pull request #471: [WIP] 3.0.0 relnotes

wohali opened a new pull request #471: [WIP] 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471
 
 
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[GitHub] [couchdb-documentation] janl commented on a change in pull request #471: 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

janl commented on a change in pull request #471: 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368054715

##########
File path: src/whatsnew/3.0.rst
##########
@@ -0,0 +1,398 @@
+.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
+.. use this file except in compliance with the License. You may obtain a copy of
+.. the License at
+..
+.. http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+.. License for the specific language governing permissions and limitations under
+.. the License.
+
+.. _release/3.0.x:
+
+============
+3.0.x Branch
+============
+
+.. contents::
+ :depth: 1
+ :local:
+
+.. _release/3.0.x/upgrade:
+
+Upgrade Notes
+=============
+
+.. rst-class:: open
+
+* :ghissue:`2228`: The default maximum document size has been reduced to 8MB. This means
+ that databases with larger documents will not be able to replicate into CouchDB 3.0
+ correctly without modification. This change has been made in preparation for
+ anticipated hard upper limits on document size imposed by CouchDB 4.0. For 3.x,
+ the max document size setting can be relaxed via the ``[couchdb] max_document_size``
+ config setting.
+* :ghissue:`2228`: The default database sharding factor ``q`` has been reduced to 2 by
+ default. This, combined with automated database resharding (see below), is a better
+ starting place for new CouchDB databases. As in CouchDB 2.x, specify ``?q=##`` to
+ change the value upon database creation if desired. The default can be changed
+ via the config ``[cluster] q`` setting.
+* :ghissue:`1523`, :ghissue:`2092`, :ghissue:`2336`: The "node-local" HTTP interface,
+ by default exposed on port 5986, has been removed. All functionality previously
+ available at that port is now available on the main, clustered interface (by default,
+ port 5984). Examples:
+
+ * ``GET /_node/{nodename}/_stats``
+ * ``GET /_node/{nodename}/_system``
+ * ``GET /_node/{nodename}/_restart``
+ * ``GET /_node/{nodename}/_all_dbs``
+ * ``GET /_node/{nodename}/_uuids``
+ * ``GET /_node/{nodename}/_config``
+ * ``GET /_node/{nodename}/_config/couchdb/uuid``
+ * ``GET /_node/{nodename}/_nodes/_changes?include_docs=true``
+ * ``GET /_node/{nodename}/{db}/{ddoc}/_info``
+ * ``PUT /_node/{nodename}/_dbs/{dbname}``
+
+ ...and so on. Documentation has been updated to reflect this change. [TODO]
+
+* :ghissue:`2389`: CouchDB 3.0 now requires a server admin user to be defined at
+ startup, or will print an error message and exit. (The Admin Party is now over.)
+* :ghissue:`2339`: All databases are now created by default as admin-only. That is, the
+ default new database ``_security`` object is now:
+
+ .. code-block:: javascript
+
+ {
+ "members" : { "roles" : [ "_admin" ] },
+ "admins" : { "roles" : [ "_admin" ] }
+ }
+
+ This can be changed after database creation.
+* Due to code changes in :ghissue:`2324`, it is not possible to upgrade transparently from
+ CouchDB 1.x to 3.x. In addition, the ``couchup`` utility has been removed from CouchDB
+ 3.0 by :ghissue:`2399`:. If you are upgrading from CouchDB 1.x, you must first upgrade
+ to CouchDB 2.3.1 to convert your database and indexes, using ``couchup`` if desired.
+ You can then upgrade to CouchDB 3.0. Or, you can start a new CouchDB 3.0 installation
+ and replicate directly from 1.x to 3.0.
+* :ghissue:`1833`, :ghissue:`2358`, :ghissue:`1871`, :ghissue:`1857`: CouchDB 3.0 supports
+ running only under the following Erlang/OTP versions:
+
+ * 19.x - "soft" support only. No longer tested, but should work.
+ * 20.x - must be newer than 20.3.8.11 (20.0, 20.1, 20.2 versions all invalid)
+ * 21.x - for 21.2, must be newer than 21.2.3
+ * 22.x - for 22.0, must be newer than 22.0.5
+
+* :ghissue:`1804`: By default, views are limited to return a maximum of 2**28 (268435456)
+ results. This limit can be configured separately for views and partitioned views via
+ the ``query_limit`` and ``partition_query_limit`` values in the ini file
+ ``[query_server_config]`` section.
+
+Deprecated feature removal
+--------------------------
+
+The following features, deprecated in CouchDB 2.x, have been removed or replaced in
+CouchDB 3.0:
+
+* :ghissue:`2089`, :ghissue:`2128`, :ghissue:`2251`: Local endpoints for replication
+ targets, which never functioned as expected in CouchDB 2.x, have been completely
+ removed. When replicating databases, always specify a full URL for the source and
+ target. In addition, the node local ``_replicator`` database is no longer automatically
+ created.
+* :ghissue:`2163`: The ``disk_size`` and ``data_size`` fields have been retired from the
+ database info object returned by ``GET /{db}/``. These were deprecated in CouchDB 2.x
+ and replaced by the ``sizes`` object, which contains the improved ``file``,
+ ``active`` and ``external`` size metrics. Fauxton has been updated to match.
+* :ghissue:`2173`: The ability to submit multiple queries against a view using the
+ :method:`POST` to ``/{db}/_design/{ddoc}/_view/{view}`` with the ``?queries=`` option
+ has been replaced by the new ``/db/_design/{ddoc}/_view/{view}/queries`` endpoint.
+ Specify a ``keys`` object when :method:`POST`-ing to this endpoint. [ADD LINK]
+* :ghissue:`2248`: CouchDB externals (``_external/``) have been removed entirely.
+* :ghissue:`2208`: CouchDB no longer supports the ``delayed_commits`` option in the
+ configuration file. All writes are now full commits. The ``/_ensure_full_commit``
+ API endpoint has been retained (as a no-op) for backwards compatibility with old
+ CouchDB replicators.
+* :ghissue:`2395`: The security object in the ``_users`` database cannot be edited by
+ default. A setting exists in the configuration file to revert this behaviour. The
+ ability to override the disable setting is expected to be removed in CouchDB 4.0.
+
+.. _release/3.0.0:
+
+Version 3.0.0
+=============
+
+Features
+--------
+
+.. rst-class:: open
+
+* :ghissue:`1789`: User-defined partitioned databases. Full documentation is here [LINK
+ TBD].
+
+ * These special databases support user-driven placement of documents into the same
+ shard range.
+ * Views and Mango indexes have specific optimizations for partitioned databases as well.
+ [TBD verify Mango specific endpoint or support]
+ * :ghissue:`1842`: Partition size limits. By default, each partition is limited
+ to 10 GiB.
+ * :ghissue:`1684`: Partitioned database support can be disabled via feature
+ flag in ``default.ini``.
+
+* :ghissue:`1972`, :ghissue:`2012`: Automated shard splitting. Databases can now be live
+ re-sharded to increase the ``q`` factor to a larger number. This can be configured
+ to require specific node and range parameters upon execution. Full documentation is
+ here [LINK TBD].
+* :ghissue:`1910`: New automatic view "warming" subsystem, ``ken``. Full documentation
+ is here [LINK TBD].
+* :ghissue:`1904`: Completely new automatic compaction daemon, ``smoosh``. Full
+ documentation is here [LINK TBD].
+* :ghissue:`1889`, :ghissue:`2408`: New IO Queue subsystem. Full documentation is
+ available here [LINK TBD].
+* :ghissue:`2037`: Dreyfus, the CouchDB side of the Lucene-powered search solution,
+ is now shipped with CouchDB. When one or more Clouseau Java nodes are joined to the
+ cluster, text-based indexes can be enabled in CouchDB. It is recommended to
+ have as many Clouseau nodes as you have CouchDB nodes. Search is advertised in the
+ feature list present at ``GET /`` if configured correctly (:ghissue:`2206`). Full
+ documentation is available at [LINK TBD].
+* :ghissue:`2411`: The ``/_up`` endpoint no longer requires authentication when
+ ``require_valid_user`` is ``true``.
+* :ghissue:`2392`: A new ``_metrics`` role can be given to a user. This allows that
+ user access only to the ``/_node/{node}/_stats`` and ``/_node/{node}/_system``
+ endpoints.
+* :ghissue:`1912`: A new alternative systemd-journald logging backend has been added,
+ and can be enabled through the ini file. The new backend does not include CouchDB's
+ microsecond-accurate timestamps, and uses the ``sd-daemon(3)`` logging levels.
+* :ghissue:`2296`, :ghissue:`1977`: If the configuration file setting ``[couchdb]``
+ ``single_node`` is set to ``true``, CouchDB will automatically create the system
+ databases on startup if they are not present.
+* :ghissue:`2338`, :ghissue:`2343`: :method:`POST` request to CouchDB views and the
+ ``/{db}/_all_docs``, ``/{db}/_local_docs`` and ``//{db}/_design_docs`` endpoints now
+ support the same functionality as :method:`GET`. Parameters are passed in the body as a
+ JSON object, rather than in the URL when using :method:`POST`.
+* :ghissue:`2292`: The ``_scheduler/docs`` and ``_scheduler/info`` endpoints now return
+ detailed replication stats for running and pending jobs.
+* :ghissue:`2282`, :ghissue:`2272`, :ghissue:`2290`: CouchDB now supports specifying
+ separate proxies for both the ``source`` and ``target`` in a replication via
+ ``source_proxy`` and ``target_proxy`` keys.
+* :ghissue:`2240`: Headers are now returned from the ``/{db}/_changes`` feed
+ immediately, even when there are no changes available. This avoids client
+ blocking.
+* :ghissue:`2005`, :ghissue:`2006`: The name of any node can now be retrieved through
+ the new API endpoint ``GET /_node/_local``.
+* :ghissue:`1766`: Timeouts for requests, ``all_docs``, attachments, views, and
+ partitioned view requests can all be specified separately in the ini file under
+ the ``[fabric]`` section. See ``default.ini`` for more detail.
+* :ghissue:`1963`: Metrics are now kept on the number of partition and global view
+ queries, along with the number of timeouts that occur.
+* :ghissue:`2452`: A new configuration field ``[couch_httpd_auth] same_site`` has
+ been added to set the value of the CouchDB auth cookie's ``SameSite`` attribute.
+ It may be necessary to set this to ``strict`` for compatibility with future
+ versions of Google Chrome. If CouchDB CORS support is enabled, set this to
+ ``None``.
+
+Performance
+-----------
+
+.. rst-class:: open
+
+* :ghissue:`2360`: It is now possible to make the rexi interface's unacked message
+ limit configurable. A new, more optimized default (5, lowered from 10) has been set.
+ This results in a ~50% improvement on view queries on large clusters with ``q ≥ 8``.
+* :ghissue:`2277`: The ``couch_server`` process has been highly optimized, supporting
+ significantly more load than before.
+* :ghissue:`2280`: Connection sharing for replication now functions correctly when
+ replicating through a forward proxy. Closes :ghissue:`2271`.
+* :ghissue:`2195`, :ghissue:`2207`: Metrics aggregation now supports CouchDB systems
+ that sleep or hibernate, ensuring that on wakeup does not trigger thousands of
+ unnecessary function calls.
+* :ghissue:`1795`: Avoid calling ``fabric:update_docs`` with empty doc lists.
+
+Bugfixes
+--------
+
+.. rst-class:: open
+
+* :ghissue:`1752`, :ghissue:`2398`: The cluster setup wizard now ensures a conssitent
+ UUID and http secret across all nodes in a cluster.
+* :ghissue:`2388`: A compatibility change has been made to support replication with
+ future databases containing per-document access control fields.
+* :ghissue:`2379`: Any replicator error messages will provide an object in the response,
+ or null, but never a string.
+* :ghissue:`2244`, :ghissue:`2310`: CouchDB will no longer send more data than is
+ requested when retrieving partial attachment data blocks.
+* :ghissue:`2138`: Manual operator updates to a database's shard map will not
+ corrupt additional database properties, such as partitioning values.
+* :ghissue:`1877`: The ``_purge`` and ``_purged_infos_limit`` endpoints are now
+ correctly restricted to server admin only.
+* :ghissue:`1794`: The minimum purge sequence value for a database is now
+ gathered without a clustered ``_all_docs`` lookup.
+* :ghissue:`2351`: A timeout case clause in ``fabric_db_info`` has been normalised
+ to match other case clauses.
+* :ghissue:`1897`: The ``/{db}/_bulk_docs`` endpoint now correctly catches invalid
+ (*i.e.*, non-hexadecimal) ``_rev_`` values and responds with a 400 error.
+* :ghissue:`2321`: CouchDB no longer requires Basic auth credentials to reach the
+ ``/_session`` endpoint for login, even when ``require_valid_user`` is enabled.
+* :ghissue:`2295`: CouchDB no longer marks a job as failed permanently if the
+ internal doc processor crashes.
+* :ghissue:`2178`: View compaction files are now removed on view cleanup.
+* :ghissue:`2179`: The error message logged when CouchDB does not have a ``_users``
+ database is now less scary.
+* :ghissue:`2153`: CouchDB no longer may return a ``badmatch`` error when querying
+ ``all_docs`` with a passed ``keys`` array.
+* :ghissue:`2137`: If search is not available, return a ``400`` instead of ``500``
+ status code.
+* :ghissue:`2077`: Any failed ``fsync(2)`` calls are now correctly raised to avoid
+ data corruption arising from retry attempts.
+* :ghissue:`2027`: Handle epoch mismatch when duplicate UUIDs are created through
+ invalid operator intervention.
+* :ghissue:`2019`: If a database is deleted and re-created while internal cluster
+ replication is still active, CouchDB will no longer retry to delete it continuously.
+* :ghissue:`2003`: CouchDB will no longer automatically reset an index file if any
+ attempt to read its header fails (such as when the couch_file process terminates
+ unexpectedly).
+* :ghissue:`1983`: Improve database "external" size calcuation to be more precise.
+* :ghissue:`1971`: Correctly compare ETags using weak comparison methods to support
+ `W/` prefix added by some load balancer configurations.
+* :ghissue:`1803`: CouchDB admin passwords are now synced when the cluster setup wizard
+ is used. This prevents being logged out when using Fauxton as a server admin user
+ through a load balancer.
+* :ghissue:`1901`: Invalid revision specified for a document update will no longer result
+ in a ``badarg`` crash.
+* :ghissue:`1845`: The ``end_time`` field in ``/_replicate`` now correctly converts time
+ to UTC.
+* :ghissue:`1824`: ``rexi`` stream workers are now cleaned up when the coordinator process
+ is killed, such as when the ddoc cache is refreshed.
+* :ghissue:`1770`: Invalid database ``_security`` objects no longer return a
+ ``function_clause`` error and stack trace.
+* :ghissue:`2412`: Mango execution stats now correctly count documents read which weren't
+ followed by a match within a given shard.
+* :ghissue:`2393`, :ghissue:`2143`: It is now possible to override the query server
+ environment variables ``COUCHDB_QUERY_SERVER_JAVASCRIPT`` and
+ ``COUCHDB_QUERY_SERVER_COFFEESCRIPT`` without overwriting the
+ ``couchdb``/``couchdb.cmd`` startup scripts.
+* :ghissue:`2426`, :ghissue:`2415`: The replicator now better handles the situation where
+ design document writes to the target fail when replicating with non-admin credentials.
+* :ghissue:`2438`: CouchDB now handles the case when a view file lacks a proper header.

Review comment:
maybe group with `2003`

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[GitHub] [couchdb-documentation] janl commented on a change in pull request #471: 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

janl commented on a change in pull request #471: 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368054359

Review comment:
maybe group this with the first in line `1752`, so the topic is together, totally not important :D

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[GitHub] [couchdb-documentation] janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368051818
 
 

 ##########
 File path: src/whatsnew/3.0.rst
 ##########
 @@ -0,0 +1,398 @@
+.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
+.. use this file except in compliance with the License. You may obtain a copy of
+.. the License at
+..
+..   http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+.. License for the specific language governing permissions and limitations under
+.. the License.
+
+.. _release/3.0.x:
+
+============
+3.0.x Branch
+============
+
+.. contents::
+    :depth: 1
+    :local:
+
+.. _release/3.0.x/upgrade:
+
+Upgrade Notes
+=============
+
+.. rst-class:: open
+
+* :ghissue:`2228`: The default maximum document size has been reduced to 8MB. This means
+  that databases with larger documents will not be able to replicate into CouchDB 3.0
+  correctly without modification. This change has been made in preparation for
+  anticipated hard upper limits on document size imposed by CouchDB 4.0. For 3.x,
+  the max document size setting can be relaxed via the ``[couchdb] max_document_size``
+  config setting.
+* :ghissue:`2228`: The default database sharding factor ``q`` has been reduced to 2 by
+  default. This, combined with automated database resharding (see below), is a better
+  starting place for new CouchDB databases. As in CouchDB 2.x, specify ``?q=##`` to
+  change the value upon database creation if desired. The default can be changed
+  via the config ``[cluster] q`` setting.
+* :ghissue:`1523`, :ghissue:`2092`, :ghissue:`2336`: The "node-local" HTTP interface,
+  by default exposed on port 5986, has been removed. All functionality previously
+  available at that port is now available on the main, clustered interface (by default,
+  port 5984). Examples:
+
+  * ``GET /_node/{nodename}/_stats``
+  * ``GET /_node/{nodename}/_system``
+  * ``GET /_node/{nodename}/_restart``
+  * ``GET /_node/{nodename}/_all_dbs``
+  * ``GET /_node/{nodename}/_uuids``
+  * ``GET /_node/{nodename}/_config``
+  * ``GET /_node/{nodename}/_config/couchdb/uuid``
+  * ``GET /_node/{nodename}/_nodes/_changes?include_docs=true``
+  * ``GET /_node/{nodename}/{db}/{ddoc}/_info``
+  * ``PUT /_node/{nodename}/_dbs/{dbname}``
+
+  ...and so on. Documentation has been updated to reflect this change. [TODO]
+
+* :ghissue:`2389`: CouchDB 3.0 now requires a server admin user to be defined at
+  startup, or will print an error message and exit. (The Admin Party is now over.)
+* :ghissue:`2339`: All databases are now created by default as admin-only. That is, the
+  default new database ``_security`` object is now:
+
+  .. code-block:: javascript
+
+    {
+      "members" : { "roles" : [ "_admin" ] },
+       "admins" : { "roles" : [ "_admin" ] }
+    }
+
+  This can be changed after database creation.
+* Due to code changes in :ghissue:`2324`, it is not possible to upgrade transparently from
+  CouchDB 1.x to 3.x. In addition, the ``couchup`` utility has been removed from CouchDB
+  3.0 by :ghissue:`2399`:. If you are upgrading from CouchDB 1.x, you must first upgrade
+  to CouchDB 2.3.1 to convert your database and indexes, using ``couchup`` if desired.
+  You can then upgrade to CouchDB 3.0. Or, you can start a new CouchDB 3.0 installation
+  and replicate directly from 1.x to 3.0.
+* :ghissue:`1833`, :ghissue:`2358`, :ghissue:`1871`, :ghissue:`1857`: CouchDB 3.0 supports
+  running only under the following Erlang/OTP versions:
+
+  * 19.x - "soft" support only. No longer tested, but should work.
+  * 20.x - must be newer than 20.3.8.11 (20.0, 20.1, 20.2 versions all invalid)
+  * 21.x - for 21.2, must be newer than 21.2.3
+  * 22.x - for 22.0, must be newer than 22.0.5
+
+* :ghissue:`1804`: By default, views are limited to return a maximum of 2**28 (268435456)
+  results. This limit can be configured separately for views and partitioned views via
+  the ``query_limit`` and ``partition_query_limit`` values in the ini file
+  ``[query_server_config]`` section.
+
+Deprecated feature removal
+--------------------------
+
+The following features, deprecated in CouchDB 2.x, have been removed or replaced in
+CouchDB 3.0:
+
+* :ghissue:`2089`, :ghissue:`2128`, :ghissue:`2251`: Local endpoints for replication
+  targets, which never functioned as expected in CouchDB 2.x, have been completely
+  removed. When replicating databases, always specify a full URL for the source and
+  target. In addition, the node local ``_replicator`` database is no longer automatically
+  created.
+* :ghissue:`2163`: The ``disk_size`` and ``data_size`` fields have been retired from the
+  database info object returned by ``GET /{db}/``. These were deprecated in CouchDB 2.x
+  and replaced by the ``sizes`` object, which contains the improved ``file``,
+  ``active`` and ``external`` size metrics. Fauxton has been updated to match.
+* :ghissue:`2173`: The ability to submit multiple queries against a view using the
+  :method:`POST` to ``/{db}/_design/{ddoc}/_view/{view}`` with the ``?queries=`` option
+  has been replaced by the new ``/db/_design/{ddoc}/_view/{view}/queries`` endpoint.
+  Specify a ``keys`` object when :method:`POST`-ing to this endpoint. [ADD LINK]
+* :ghissue:`2248`: CouchDB externals (``_external/``) have been removed entirely.
+* :ghissue:`2208`: CouchDB no longer supports the ``delayed_commits`` option in the
+  configuration file. All writes are now full commits. The ``/_ensure_full_commit``
+  API endpoint has been retained (as a no-op) for backwards compatibility with old
+  CouchDB replicators.
+* :ghissue:`2395`: The security object in the ``_users`` database cannot be edited by
+  default. A setting exists in the configuration file to revert this behaviour. The
+  ability to override the disable setting is expected to be removed in CouchDB 4.0.
+
+.. _release/3.0.0:
+
+Version 3.0.0
+=============
+
+Features
+--------
+
+.. rst-class:: open
+
+* :ghissue:`1789`: User-defined partitioned databases. Full documentation is here [LINK
+  TBD].
+
+  * These special databases support user-driven placement of documents into the same
+    shard range.
+  * Views and Mango indexes have specific optimizations for partitioned databases as well.
+    [TBD verify Mango specific endpoint or support]
+  * :ghissue:`1842`: Partition size limits. By default, each partition is limited
+    to 10 GiB.
+  * :ghissue:`1684`: Partitioned database support can be disabled via feature
+    flag in ``default.ini``.
+
+* :ghissue:`1972`, :ghissue:`2012`: Automated shard splitting. Databases can now be live
+  re-sharded to increase the ``q`` factor to a larger number. This can be configured
+  to require specific node and range parameters upon execution. Full documentation is
+  here [LINK TBD].
+* :ghissue:`1910`: New automatic view "warming" subsystem, ``ken``. Full documentation
+  is here [LINK TBD].
+* :ghissue:`1904`: Completely new automatic compaction daemon, ``smoosh``. Full
+  documentation is here [LINK TBD].
+* :ghissue:`1889`, :ghissue:`2408`: New IO Queue subsystem. Full documentation is
+  available here [LINK TBD].
+* :ghissue:`2037`: Dreyfus, the CouchDB side of the Lucene-powered search solution,
+  is now shipped with CouchDB. When one or more Clouseau Java nodes are joined to the
+  cluster, text-based indexes can be enabled in CouchDB. It is recommended to
+  have as many Clouseau nodes as you have CouchDB nodes. Search is advertised in the
+  feature list present at ``GET /`` if configured correctly (:ghissue:`2206`). Full
+  documentation is available at [LINK TBD].
+* :ghissue:`2411`: The ``/_up`` endpoint no longer requires authentication when
 
 Review comment:
   /_up can be configured to not require auth even when require_valid_user is enabled.

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[GitHub] [couchdb-documentation] janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368048766
 
 

 ##########
 File path: src/whatsnew/3.0.rst
 ##########
 @@ -0,0 +1,398 @@
+.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
+.. use this file except in compliance with the License. You may obtain a copy of
+.. the License at
+..
+..   http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+.. License for the specific language governing permissions and limitations under
+.. the License.
+
+.. _release/3.0.x:
+
+============
+3.0.x Branch
+============
+
+.. contents::
+    :depth: 1
+    :local:
+
+.. _release/3.0.x/upgrade:
+
+Upgrade Notes
+=============
+
+.. rst-class:: open
+
+* :ghissue:`2228`: The default maximum document size has been reduced to 8MB. This means
+  that databases with larger documents will not be able to replicate into CouchDB 3.0
+  correctly without modification. This change has been made in preparation for
+  anticipated hard upper limits on document size imposed by CouchDB 4.0. For 3.x,
+  the max document size setting can be relaxed via the ``[couchdb] max_document_size``
+  config setting.
+* :ghissue:`2228`: The default database sharding factor ``q`` has been reduced to 2 by
+  default. This, combined with automated database resharding (see below), is a better
+  starting place for new CouchDB databases. As in CouchDB 2.x, specify ``?q=##`` to
 
 Review comment:
   ```suggestion
     starting place for new CouchDB databases. As in CouchDB 2.x, specify ``?q=#`` to
   ```
   
   maybe just one placeholder to avoid confusion

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[GitHub] [couchdb-documentation] janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368052159
 
 

 ##########
 File path: src/whatsnew/3.0.rst
 ##########
 @@ -0,0 +1,398 @@
+.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
+.. use this file except in compliance with the License. You may obtain a copy of
+.. the License at
+..
+..   http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+.. License for the specific language governing permissions and limitations under
+.. the License.
+
+.. _release/3.0.x:
+
+============
+3.0.x Branch
+============
+
+.. contents::
+    :depth: 1
+    :local:
+
+.. _release/3.0.x/upgrade:
+
+Upgrade Notes
+=============
+
+.. rst-class:: open
+
+* :ghissue:`2228`: The default maximum document size has been reduced to 8MB. This means
+  that databases with larger documents will not be able to replicate into CouchDB 3.0
+  correctly without modification. This change has been made in preparation for
+  anticipated hard upper limits on document size imposed by CouchDB 4.0. For 3.x,
+  the max document size setting can be relaxed via the ``[couchdb] max_document_size``
+  config setting.
+* :ghissue:`2228`: The default database sharding factor ``q`` has been reduced to 2 by
+  default. This, combined with automated database resharding (see below), is a better
+  starting place for new CouchDB databases. As in CouchDB 2.x, specify ``?q=##`` to
+  change the value upon database creation if desired. The default can be changed
+  via the config ``[cluster] q`` setting.
+* :ghissue:`1523`, :ghissue:`2092`, :ghissue:`2336`: The "node-local" HTTP interface,
+  by default exposed on port 5986, has been removed. All functionality previously
+  available at that port is now available on the main, clustered interface (by default,
+  port 5984). Examples:
+
+  * ``GET /_node/{nodename}/_stats``
+  * ``GET /_node/{nodename}/_system``
+  * ``GET /_node/{nodename}/_restart``
+  * ``GET /_node/{nodename}/_all_dbs``
+  * ``GET /_node/{nodename}/_uuids``
+  * ``GET /_node/{nodename}/_config``
+  * ``GET /_node/{nodename}/_config/couchdb/uuid``
+  * ``GET /_node/{nodename}/_nodes/_changes?include_docs=true``
+  * ``GET /_node/{nodename}/{db}/{ddoc}/_info``
+  * ``PUT /_node/{nodename}/_dbs/{dbname}``
+
+  ...and so on. Documentation has been updated to reflect this change. [TODO]
+
+* :ghissue:`2389`: CouchDB 3.0 now requires a server admin user to be defined at
+  startup, or will print an error message and exit. (The Admin Party is now over.)
+* :ghissue:`2339`: All databases are now created by default as admin-only. That is, the
+  default new database ``_security`` object is now:
+
+  .. code-block:: javascript
+
+    {
+      "members" : { "roles" : [ "_admin" ] },
+       "admins" : { "roles" : [ "_admin" ] }
+    }
+
+  This can be changed after database creation.
+* Due to code changes in :ghissue:`2324`, it is not possible to upgrade transparently from
+  CouchDB 1.x to 3.x. In addition, the ``couchup`` utility has been removed from CouchDB
+  3.0 by :ghissue:`2399`:. If you are upgrading from CouchDB 1.x, you must first upgrade
+  to CouchDB 2.3.1 to convert your database and indexes, using ``couchup`` if desired.
+  You can then upgrade to CouchDB 3.0. Or, you can start a new CouchDB 3.0 installation
+  and replicate directly from 1.x to 3.0.
+* :ghissue:`1833`, :ghissue:`2358`, :ghissue:`1871`, :ghissue:`1857`: CouchDB 3.0 supports
+  running only under the following Erlang/OTP versions:
+
+  * 19.x - "soft" support only. No longer tested, but should work.
+  * 20.x - must be newer than 20.3.8.11 (20.0, 20.1, 20.2 versions all invalid)
+  * 21.x - for 21.2, must be newer than 21.2.3
+  * 22.x - for 22.0, must be newer than 22.0.5
+
+* :ghissue:`1804`: By default, views are limited to return a maximum of 2**28 (268435456)
+  results. This limit can be configured separately for views and partitioned views via
+  the ``query_limit`` and ``partition_query_limit`` values in the ini file
+  ``[query_server_config]`` section.
+
+Deprecated feature removal
+--------------------------
+
+The following features, deprecated in CouchDB 2.x, have been removed or replaced in
+CouchDB 3.0:
+
+* :ghissue:`2089`, :ghissue:`2128`, :ghissue:`2251`: Local endpoints for replication
+  targets, which never functioned as expected in CouchDB 2.x, have been completely
+  removed. When replicating databases, always specify a full URL for the source and
+  target. In addition, the node local ``_replicator`` database is no longer automatically
+  created.
+* :ghissue:`2163`: The ``disk_size`` and ``data_size`` fields have been retired from the
+  database info object returned by ``GET /{db}/``. These were deprecated in CouchDB 2.x
+  and replaced by the ``sizes`` object, which contains the improved ``file``,
+  ``active`` and ``external`` size metrics. Fauxton has been updated to match.
+* :ghissue:`2173`: The ability to submit multiple queries against a view using the
+  :method:`POST` to ``/{db}/_design/{ddoc}/_view/{view}`` with the ``?queries=`` option
+  has been replaced by the new ``/db/_design/{ddoc}/_view/{view}/queries`` endpoint.
+  Specify a ``keys`` object when :method:`POST`-ing to this endpoint. [ADD LINK]
+* :ghissue:`2248`: CouchDB externals (``_external/``) have been removed entirely.
+* :ghissue:`2208`: CouchDB no longer supports the ``delayed_commits`` option in the
+  configuration file. All writes are now full commits. The ``/_ensure_full_commit``
+  API endpoint has been retained (as a no-op) for backwards compatibility with old
+  CouchDB replicators.
+* :ghissue:`2395`: The security object in the ``_users`` database cannot be edited by
+  default. A setting exists in the configuration file to revert this behaviour. The
+  ability to override the disable setting is expected to be removed in CouchDB 4.0.
+
+.. _release/3.0.0:
+
+Version 3.0.0
+=============
+
+Features
+--------
+
+.. rst-class:: open
+
+* :ghissue:`1789`: User-defined partitioned databases. Full documentation is here [LINK
+  TBD].
+
+  * These special databases support user-driven placement of documents into the same
+    shard range.
+  * Views and Mango indexes have specific optimizations for partitioned databases as well.
+    [TBD verify Mango specific endpoint or support]
+  * :ghissue:`1842`: Partition size limits. By default, each partition is limited
+    to 10 GiB.
+  * :ghissue:`1684`: Partitioned database support can be disabled via feature
+    flag in ``default.ini``.
+
+* :ghissue:`1972`, :ghissue:`2012`: Automated shard splitting. Databases can now be live
+  re-sharded to increase the ``q`` factor to a larger number. This can be configured
+  to require specific node and range parameters upon execution. Full documentation is
+  here [LINK TBD].
+* :ghissue:`1910`: New automatic view "warming" subsystem, ``ken``. Full documentation
+  is here [LINK TBD].
+* :ghissue:`1904`: Completely new automatic compaction daemon, ``smoosh``. Full
+  documentation is here [LINK TBD].
+* :ghissue:`1889`, :ghissue:`2408`: New IO Queue subsystem. Full documentation is
+  available here [LINK TBD].
+* :ghissue:`2037`: Dreyfus, the CouchDB side of the Lucene-powered search solution,
+  is now shipped with CouchDB. When one or more Clouseau Java nodes are joined to the
+  cluster, text-based indexes can be enabled in CouchDB. It is recommended to
+  have as many Clouseau nodes as you have CouchDB nodes. Search is advertised in the
+  feature list present at ``GET /`` if configured correctly (:ghissue:`2206`). Full
+  documentation is available at [LINK TBD].
+* :ghissue:`2411`: The ``/_up`` endpoint no longer requires authentication when
+  ``require_valid_user`` is ``true``.
+* :ghissue:`2392`: A new ``_metrics`` role can be given to a user. This allows that
+  user access only to the ``/_node/{node}/_stats`` and ``/_node/{node}/_system``
+  endpoints.
+* :ghissue:`1912`: A new alternative systemd-journald logging backend has been added,
+  and can be enabled through the ini file. The new backend does not include CouchDB's
+  microsecond-accurate timestamps, and uses the ``sd-daemon(3)`` logging levels.
+* :ghissue:`2296`, :ghissue:`1977`: If the configuration file setting ``[couchdb]``
+  ``single_node`` is set to ``true``, CouchDB will automatically create the system
+  databases on startup if they are not present.
+* :ghissue:`2338`, :ghissue:`2343`: :method:`POST` request to CouchDB views and the
+  ``/{db}/_all_docs``, ``/{db}/_local_docs`` and ``//{db}/_design_docs`` endpoints now
 
 Review comment:
   ```suggestion
     ``/{db}/_all_docs``, ``/{db}/_local_docs`` and ``/{db}/_design_docs`` endpoints now
   ```

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[GitHub] [couchdb-documentation] janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368049446
 
 

 ##########
 File path: src/whatsnew/3.0.rst
 ##########
 @@ -0,0 +1,398 @@
+.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
+.. use this file except in compliance with the License. You may obtain a copy of
+.. the License at
+..
+..   http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+.. License for the specific language governing permissions and limitations under
+.. the License.
+
+.. _release/3.0.x:
+
+============
+3.0.x Branch
+============
+
+.. contents::
+    :depth: 1
+    :local:
+
+.. _release/3.0.x/upgrade:
+
+Upgrade Notes
+=============
+
+.. rst-class:: open
+
+* :ghissue:`2228`: The default maximum document size has been reduced to 8MB. This means
+  that databases with larger documents will not be able to replicate into CouchDB 3.0
+  correctly without modification. This change has been made in preparation for
+  anticipated hard upper limits on document size imposed by CouchDB 4.0. For 3.x,
+  the max document size setting can be relaxed via the ``[couchdb] max_document_size``
+  config setting.
+* :ghissue:`2228`: The default database sharding factor ``q`` has been reduced to 2 by
+  default. This, combined with automated database resharding (see below), is a better
+  starting place for new CouchDB databases. As in CouchDB 2.x, specify ``?q=##`` to
+  change the value upon database creation if desired. The default can be changed
+  via the config ``[cluster] q`` setting.
+* :ghissue:`1523`, :ghissue:`2092`, :ghissue:`2336`: The "node-local" HTTP interface,
+  by default exposed on port 5986, has been removed. All functionality previously
+  available at that port is now available on the main, clustered interface (by default,
+  port 5984). Examples:
+
+  * ``GET /_node/{nodename}/_stats``
+  * ``GET /_node/{nodename}/_system``
+  * ``GET /_node/{nodename}/_restart``
+  * ``GET /_node/{nodename}/_all_dbs``
+  * ``GET /_node/{nodename}/_uuids``
+  * ``GET /_node/{nodename}/_config``
+  * ``GET /_node/{nodename}/_config/couchdb/uuid``
+  * ``GET /_node/{nodename}/_nodes/_changes?include_docs=true``
+  * ``GET /_node/{nodename}/{db}/{ddoc}/_info``
+  * ``PUT /_node/{nodename}/_dbs/{dbname}``
+
+  ...and so on. Documentation has been updated to reflect this change. [TODO]
+
+* :ghissue:`2389`: CouchDB 3.0 now requires a server admin user to be defined at
+  startup, or will print an error message and exit. (The Admin Party is now over.)
 
 Review comment:
   needs link to a sad trombone gif :D https://media.giphy.com/media/4GXOphKW64BZZdh0Au/giphy.gif

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[GitHub] [couchdb-documentation] wohali commented on issue #471: 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

wohali commented on issue #471: 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#issuecomment-575817153
 
 
   This is ready for review, except for incorporating changes from other 3.0.0 milestone docs tickets that need mentioning/linking in the relnotes.

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[GitHub] [couchdb-documentation] wohali commented on a change in pull request #471: [WIP] 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

wohali commented on a change in pull request #471: [WIP] 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368081144
 
 

 ##########
 File path: src/whatsnew/3.0.rst
 ##########
 @@ -0,0 +1,398 @@
+.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
+.. use this file except in compliance with the License. You may obtain a copy of
+.. the License at
+..
+..   http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+.. License for the specific language governing permissions and limitations under
+.. the License.
+
+.. _release/3.0.x:
+
+============
+3.0.x Branch
+============
+
+.. contents::
+    :depth: 1
+    :local:
+
+.. _release/3.0.x/upgrade:
+
+Upgrade Notes
+=============
+
+.. rst-class:: open
+
+* :ghissue:`2228`: The default maximum document size has been reduced to 8MB. This means
+  that databases with larger documents will not be able to replicate into CouchDB 3.0
+  correctly without modification. This change has been made in preparation for
+  anticipated hard upper limits on document size imposed by CouchDB 4.0. For 3.x,
+  the max document size setting can be relaxed via the ``[couchdb] max_document_size``
+  config setting.
+* :ghissue:`2228`: The default database sharding factor ``q`` has been reduced to 2 by
+  default. This, combined with automated database resharding (see below), is a better
+  starting place for new CouchDB databases. As in CouchDB 2.x, specify ``?q=##`` to
+  change the value upon database creation if desired. The default can be changed
+  via the config ``[cluster] q`` setting.
+* :ghissue:`1523`, :ghissue:`2092`, :ghissue:`2336`: The "node-local" HTTP interface,
+  by default exposed on port 5986, has been removed. All functionality previously
+  available at that port is now available on the main, clustered interface (by default,
+  port 5984). Examples:
+
+  * ``GET /_node/{nodename}/_stats``
+  * ``GET /_node/{nodename}/_system``
+  * ``GET /_node/{nodename}/_restart``
+  * ``GET /_node/{nodename}/_all_dbs``
+  * ``GET /_node/{nodename}/_uuids``
+  * ``GET /_node/{nodename}/_config``
+  * ``GET /_node/{nodename}/_config/couchdb/uuid``
+  * ``GET /_node/{nodename}/_nodes/_changes?include_docs=true``
+  * ``GET /_node/{nodename}/{db}/{ddoc}/_info``
+  * ``PUT /_node/{nodename}/_dbs/{dbname}``
+
+  ...and so on. Documentation has been updated to reflect this change. [TODO]
+
+* :ghissue:`2389`: CouchDB 3.0 now requires a server admin user to be defined at
+  startup, or will print an error message and exit. (The Admin Party is now over.)
 
 Review comment:
   added cute cat picture with CC-BY-NC license, feel free to bikeshed

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[GitHub] [couchdb-documentation] janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368048307
 
 

 ##########
 File path: make.bat
 ##########
 @@ -41,6 +41,7 @@ if "%1" == "help" (
 	echo.  pseudoxml  to make pseudoxml-XML files for display purposes
 	echo.  linkcheck  to check all external links for integrity
 	echo.  doctest    to run all doctests embedded in the documentation if enabled
+    echo.  check      to run the Python based linter
 
 Review comment:
   whitespace mismatch

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[GitHub] [couchdb-documentation] wohali merged pull request #471: 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

wohali merged pull request #471: 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471
 
 
   

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[GitHub] [couchdb-documentation] janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes

Posted by GitBox <gi...@apache.org>.

janl commented on a change in pull request #471: [WIP] 3.0.0 relnotes
URL: https://github.com/apache/couchdb-documentation/pull/471#discussion_r368053154
 
 

 ##########
 File path: src/whatsnew/3.0.rst
 ##########
 @@ -0,0 +1,398 @@
+.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
+.. use this file except in compliance with the License. You may obtain a copy of
+.. the License at
+..
+..   http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+.. License for the specific language governing permissions and limitations under
+.. the License.
+
+.. _release/3.0.x:
+
+============
+3.0.x Branch
+============
+
+.. contents::
+    :depth: 1
+    :local:
+
+.. _release/3.0.x/upgrade:
+
+Upgrade Notes
+=============
+
+.. rst-class:: open
+
+* :ghissue:`2228`: The default maximum document size has been reduced to 8MB. This means
+  that databases with larger documents will not be able to replicate into CouchDB 3.0
+  correctly without modification. This change has been made in preparation for
+  anticipated hard upper limits on document size imposed by CouchDB 4.0. For 3.x,
+  the max document size setting can be relaxed via the ``[couchdb] max_document_size``
+  config setting.
+* :ghissue:`2228`: The default database sharding factor ``q`` has been reduced to 2 by
+  default. This, combined with automated database resharding (see below), is a better
+  starting place for new CouchDB databases. As in CouchDB 2.x, specify ``?q=##`` to
+  change the value upon database creation if desired. The default can be changed
+  via the config ``[cluster] q`` setting.
+* :ghissue:`1523`, :ghissue:`2092`, :ghissue:`2336`: The "node-local" HTTP interface,
+  by default exposed on port 5986, has been removed. All functionality previously
+  available at that port is now available on the main, clustered interface (by default,
+  port 5984). Examples:
+
+  * ``GET /_node/{nodename}/_stats``
+  * ``GET /_node/{nodename}/_system``
+  * ``GET /_node/{nodename}/_restart``
+  * ``GET /_node/{nodename}/_all_dbs``
+  * ``GET /_node/{nodename}/_uuids``
+  * ``GET /_node/{nodename}/_config``
+  * ``GET /_node/{nodename}/_config/couchdb/uuid``
+  * ``GET /_node/{nodename}/_nodes/_changes?include_docs=true``
+  * ``GET /_node/{nodename}/{db}/{ddoc}/_info``
+  * ``PUT /_node/{nodename}/_dbs/{dbname}``
+
+  ...and so on. Documentation has been updated to reflect this change. [TODO]
+
+* :ghissue:`2389`: CouchDB 3.0 now requires a server admin user to be defined at
+  startup, or will print an error message and exit. (The Admin Party is now over.)
+* :ghissue:`2339`: All databases are now created by default as admin-only. That is, the
+  default new database ``_security`` object is now:
+
+  .. code-block:: javascript
+
+    {
+      "members" : { "roles" : [ "_admin" ] },
+       "admins" : { "roles" : [ "_admin" ] }
+    }
+
+  This can be changed after database creation.
+* Due to code changes in :ghissue:`2324`, it is not possible to upgrade transparently from
+  CouchDB 1.x to 3.x. In addition, the ``couchup`` utility has been removed from CouchDB
+  3.0 by :ghissue:`2399`:. If you are upgrading from CouchDB 1.x, you must first upgrade
+  to CouchDB 2.3.1 to convert your database and indexes, using ``couchup`` if desired.
+  You can then upgrade to CouchDB 3.0. Or, you can start a new CouchDB 3.0 installation
+  and replicate directly from 1.x to 3.0.
+* :ghissue:`1833`, :ghissue:`2358`, :ghissue:`1871`, :ghissue:`1857`: CouchDB 3.0 supports
+  running only under the following Erlang/OTP versions:
+
+  * 19.x - "soft" support only. No longer tested, but should work.
+  * 20.x - must be newer than 20.3.8.11 (20.0, 20.1, 20.2 versions all invalid)
+  * 21.x - for 21.2, must be newer than 21.2.3
+  * 22.x - for 22.0, must be newer than 22.0.5
+
+* :ghissue:`1804`: By default, views are limited to return a maximum of 2**28 (268435456)
+  results. This limit can be configured separately for views and partitioned views via
+  the ``query_limit`` and ``partition_query_limit`` values in the ini file
+  ``[query_server_config]`` section.
+
+Deprecated feature removal
+--------------------------
+
+The following features, deprecated in CouchDB 2.x, have been removed or replaced in
+CouchDB 3.0:
+
+* :ghissue:`2089`, :ghissue:`2128`, :ghissue:`2251`: Local endpoints for replication
+  targets, which never functioned as expected in CouchDB 2.x, have been completely
+  removed. When replicating databases, always specify a full URL for the source and
+  target. In addition, the node local ``_replicator`` database is no longer automatically
+  created.
+* :ghissue:`2163`: The ``disk_size`` and ``data_size`` fields have been retired from the
+  database info object returned by ``GET /{db}/``. These were deprecated in CouchDB 2.x
+  and replaced by the ``sizes`` object, which contains the improved ``file``,
+  ``active`` and ``external`` size metrics. Fauxton has been updated to match.
+* :ghissue:`2173`: The ability to submit multiple queries against a view using the
+  :method:`POST` to ``/{db}/_design/{ddoc}/_view/{view}`` with the ``?queries=`` option
+  has been replaced by the new ``/db/_design/{ddoc}/_view/{view}/queries`` endpoint.
+  Specify a ``keys`` object when :method:`POST`-ing to this endpoint. [ADD LINK]
+* :ghissue:`2248`: CouchDB externals (``_external/``) have been removed entirely.
+* :ghissue:`2208`: CouchDB no longer supports the ``delayed_commits`` option in the
+  configuration file. All writes are now full commits. The ``/_ensure_full_commit``
+  API endpoint has been retained (as a no-op) for backwards compatibility with old
+  CouchDB replicators.
+* :ghissue:`2395`: The security object in the ``_users`` database cannot be edited by
+  default. A setting exists in the configuration file to revert this behaviour. The
+  ability to override the disable setting is expected to be removed in CouchDB 4.0.
+
+.. _release/3.0.0:
+
+Version 3.0.0
+=============
+
+Features
+--------
+
+.. rst-class:: open
+
+* :ghissue:`1789`: User-defined partitioned databases. Full documentation is here [LINK
+  TBD].
+
+  * These special databases support user-driven placement of documents into the same
+    shard range.
+  * Views and Mango indexes have specific optimizations for partitioned databases as well.
+    [TBD verify Mango specific endpoint or support]
+  * :ghissue:`1842`: Partition size limits. By default, each partition is limited
+    to 10 GiB.
+  * :ghissue:`1684`: Partitioned database support can be disabled via feature
+    flag in ``default.ini``.
+
+* :ghissue:`1972`, :ghissue:`2012`: Automated shard splitting. Databases can now be live
+  re-sharded to increase the ``q`` factor to a larger number. This can be configured
+  to require specific node and range parameters upon execution. Full documentation is
+  here [LINK TBD].
+* :ghissue:`1910`: New automatic view "warming" subsystem, ``ken``. Full documentation
+  is here [LINK TBD].
+* :ghissue:`1904`: Completely new automatic compaction daemon, ``smoosh``. Full
+  documentation is here [LINK TBD].
+* :ghissue:`1889`, :ghissue:`2408`: New IO Queue subsystem. Full documentation is
+  available here [LINK TBD].
+* :ghissue:`2037`: Dreyfus, the CouchDB side of the Lucene-powered search solution,
+  is now shipped with CouchDB. When one or more Clouseau Java nodes are joined to the
+  cluster, text-based indexes can be enabled in CouchDB. It is recommended to
+  have as many Clouseau nodes as you have CouchDB nodes. Search is advertised in the
+  feature list present at ``GET /`` if configured correctly (:ghissue:`2206`). Full
+  documentation is available at [LINK TBD].
+* :ghissue:`2411`: The ``/_up`` endpoint no longer requires authentication when
+  ``require_valid_user`` is ``true``.
+* :ghissue:`2392`: A new ``_metrics`` role can be given to a user. This allows that
+  user access only to the ``/_node/{node}/_stats`` and ``/_node/{node}/_system``
+  endpoints.
+* :ghissue:`1912`: A new alternative systemd-journald logging backend has been added,
+  and can be enabled through the ini file. The new backend does not include CouchDB's
+  microsecond-accurate timestamps, and uses the ``sd-daemon(3)`` logging levels.
+* :ghissue:`2296`, :ghissue:`1977`: If the configuration file setting ``[couchdb]``
+  ``single_node`` is set to ``true``, CouchDB will automatically create the system
+  databases on startup if they are not present.
+* :ghissue:`2338`, :ghissue:`2343`: :method:`POST` request to CouchDB views and the
+  ``/{db}/_all_docs``, ``/{db}/_local_docs`` and ``//{db}/_design_docs`` endpoints now
+  support the same functionality as :method:`GET`.  Parameters are passed in the body as a
+  JSON object, rather than in the URL when using :method:`POST`.
+* :ghissue:`2292`: The ``_scheduler/docs`` and ``_scheduler/info`` endpoints now return
+  detailed replication stats for running and pending jobs.
+* :ghissue:`2282`, :ghissue:`2272`, :ghissue:`2290`: CouchDB now supports specifying
+  separate proxies for both the ``source`` and ``target`` in a replication via
+  ``source_proxy`` and ``target_proxy`` keys.
+* :ghissue:`2240`: Headers are now returned from the ``/{db}/_changes`` feed
+  immediately, even when there are no changes available. This avoids client
+  blocking.
+* :ghissue:`2005`, :ghissue:`2006`: The name of any node can now be retrieved through
+  the new API endpoint ``GET /_node/_local``.
+* :ghissue:`1766`: Timeouts for requests, ``all_docs``, attachments, views, and
+  partitioned view requests can all be specified separately in the ini file under
+  the ``[fabric]`` section. See ``default.ini`` for more detail.
+* :ghissue:`1963`: Metrics are now kept on the number of partition and global view
+  queries, along with the number of timeouts that occur.
+* :ghissue:`2452`: A new configuration field ``[couch_httpd_auth] same_site`` has
+  been added to set the value of the CouchDB auth cookie's ``SameSite`` attribute.
+  It may be necessary to set this to ``strict`` for compatibility with future
+  versions of Google Chrome. If CouchDB CORS support is enabled, set this to
+  ``None``.
+
+Performance
+-----------
+
+.. rst-class:: open
+
+* :ghissue:`2360`: It is now possible to make the rexi interface's unacked message
+  limit configurable. A new, more optimized default (5, lowered from 10) has been set.
+  This results in a ~50% improvement on view queries on large clusters with ``q ≥ 8``.
+* :ghissue:`2277`: The ``couch_server`` process has been highly optimized, supporting
 
 Review comment:
   maybe put this one first?

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