1.1. 3.2.x Branch
- 1.1.1. Version 3.2.0

1.1. 3.2.x Branch

Version 3.2.0

1.1.1. Version 3.2.0

1.1.1.1. Features and Enhancements

#3364: CouchDB’s replicator now implements a Fair Share replication scheduler. Rather than using a round-robin scheduling mechanism, this update allows specifying the relative priority of jobs via different _replicator databases. More information is available in the _replicator DB docs.

#3166: Allow custom JWT claims for roles, via the [jwt_auth] roles_claim_name config setting.
#3296, #3312: CouchDB now includes weatherreport and its dependency custodian, a diagnostic app forked from Basho’s riaknostic tool. More documentation is available in the Cluster Troubleshooting section.
#2911, #3298, #3425: CouchDB now returns the version of SpiderMonkey to administrators in the GET /_node/{node-name}/_versions response.
#3303: CouchDB now treats a 408 response received by the replicator similar to any 5xx error (by retrying, as opposed to a permanent error). CouchDB will never return a 408, but some reverse proxies in front of CouchDB may return this code.
#3322: _session now accepts gzip encoding.
#3254: The new $keyMapMatch operator allows Mango to query on the keys of a map. It is similar to the $elemMatch operator, but instead of operating on the elements of array, it operates on the keys of a map.
#3336: Developers now have access to a .devcontainer configuration for the 3.x version of CouchDB, right in the source code repository.
#3347: The default maximum attachment size has been reduced from infinity to 1 GiB.
#3361: Compaction process suspension now appears in the active_tasks output, allowing administrators to verify that the strict_window value is being respected.
#3378: The [admins] section and the [replicator] password are now redacted from all logs. In addition, #3380 removes user credentials, user documents and design documents from logfiles as much as possible. Further, #3489 no longer logs all of the messages received by a terminated internal Erlang process.
#3421, #3500: CouchDB now supports SpiderMonkey 78 and 86.
#3422: CouchDB now supports Erlang/OTP 23 and error_logger reports for Erlang/OTP >= 21.
#3566: CouchDB now also supports Erlang/OTP 24.
#3571: CouchDB no longer supports Erlang/OTP 19.
#3643: Contribute a custom Erlang network protocol to CouchDB, users can specify nodes to use TCP or TLS.

#3472, #3473, #3609: Migrate some config options from [httpd] to [chttpd], migrate some from [couch_httpd_auth] to [chttpd_auth], and comment all out in the default.ini.
- Config options moved from [httpd] to [chttpd]: allow_jsonp, changes_timeout, config_whitelist, enable_cors, secure_rewrites, x_forwarded_host, x_forwarded_proto, x_forwarded_ssl, enable_xframe_options, max_http_request_size.
- Config options moved from [couch_httpd_auth] to [chttpd_auth]: authentication_redirect, require_valid_user, timeout, auth_cache_size, allow_persistent_cookies, iterations, min_iterations, max_iterations, password_scheme, proxy_use_secret, public_fields, secret, users_db_public, x_auth_roles, x_auth_token, x_auth_username, cookie_domain, same_site
#3586: We added a new way of specifying basic auth credentials which can include various characters previously not allowed to be included in the url info part of endpoint urls.
#3483: We added a way of specifying requirements for new user passwords using a list of regular expressions.
#3506, #3416, #3377: CouchDB now provides a Prometheus compatible endpoint at GET /_node/{node-name}/_prometheus. A configuration option allows for scraping via a different port (17986) that does not require authentication, if desired. More information is available at the Prometheus API endpoint summary.
#3697, COUCHDB-883 (JIRA): As an opt-in policy, CouchDB can now stop encoding the plus sign + in non-query parts of URLs, in compliance with the original CouchDB standards. The opt-in is via the [chttpd] decode_plus_to_space = true setting. In CouchDB 4.x, this is going to be an opt-out policy.
#3724: CouchDB now has new CSP settings for attachments and show/list functions. This deprecates the old [csp] enable and [csp] header_value settings, replacing them with the new [csp] utils_enable and [csp] utils_header_value settings respectively. In addition, new settings for attachments_enable, attachments_header_value, showlist_enable and showlist_header_value now are available. Documentation is in the default.ini file.
#3734, #3733: Users with databases that have low q and n values would often receive the No DB shards could be opened error when the cluster is overloaded, due to a hard-coded 100ms timeout. CouchDB now calculates a more reasonable timeout, based on the number of shards and the overall maximum fabric request timeout limit, using a geometric series.

1.1.1.2. Performance

#3337: Developer nodes now start faster when using the dev/run script.
#3366: The monolithic couch_server process has been sharded for performance. Previously, as a single gen_server, the process would have a finite throughput that, in busy clusters, is easily breached – causing a sizeable backlog in the message queue, ultimately leading to failure and errors. No more! The aggregate message queue info is still available in the _system output. ( #3370 )
#3208: CouchDB now uses the latest ibrowse 4.4.2 client for the replicator.
#3600, #3047, #3019: The default slack channel for smoosh auto-compaction has been increased to a more reasonable value, reducing load on systems that would have normally been idle in CouchDB 2.x (where no auto-compaction daemon exists).
#3711: Changes feeds may no longer rewind after shard moves, assuming the node and range specified by the changes feed nonce can still match an existing node’s shard.

1.1.1.3. Bugfixes

Complete retirement of the JavaScript test suite - replaced by Elixir. Hooray!
#3165: Allow configurability of JWT claims that require a value. Also fixes #3232. Further, #3392 no longer validates claims provided that CouchDB does not require.
#3160, #3161: The run_queue statistic now returns valid information even when using Erlang BEAM dirty CPU and IO queues.
#3162: Makefiles updated to include local configs & clean configs when running make devclean.
#3195: The max_document_size parameter now has a clearer explanation in default.ini.
#3207, #2536: Improve the INSTALL.Unix.md file.
#3212: Base and extra headers are properly combined when making replicator requests that contain duplicate headers.
#3201: When using a POST with request body to pass parameters to a view-like request, the boolean parameters are accepting only JSON strings, but not booleans. Now, CouchDB accepts true and false for the stable parameter, in addition to "true" and "false". comment in
#1988: Attachment operations PUT /db/doc and POST /db now perform consistent attachment name validation.
#3249: Documents with lots of conflicts no longer blow up couchjs if the user calls _changes with a JS filter and with style=all_docs.
#3144: Respawning compaction jobs to catch up with intervening changes are now handled correctly by the smoosh monitor.
#3252: CouchDB now exports the couch_util:json_decode/2 function to support maps instead of the default data structure.
#3255, #2558: View files that have incorrect db_headers now reset the index forcing a rebuild.
#3271: Attachments that are stored uncompressed but later replicated to nodes that compress the attachment no longer fail an internal md5 check that would break eventual consistency between nodes.
#3277: req_body requests that have req_body set already now properly return the field without parsing.
#3279: Some default headers were missing from some responses in replication, including X-CouchDB-Body-Time and X-Couch-Request-ID.
#3329, #2962: CouchDB no longer returns broken couchjs processes to the internal viewserver process pool.
#3340, #1943: PUTs of multipart/related attachments now support a Transfer-Encoding value of chunked. Hooray!
#2858, #3359: The cluster setup wizard no longer fails when a request to / is not made before a request to finish_cluster.
#3368: Changing the max_dbs_open configuration setting correctly ensures that each new couch_server_X property receives 1/num_servers() of it.
#3373: Requests to {db}/_changes with a custom filter no longer result in a fabric request timeout if the request body is not available to additional cluster nodes, resulting in a more descriptive exit message and proper JSON object validation in the payload.
#3409: The internal chttpd_external:json_req_obj/2 function now reads the cached peer before falling back to a socket read operation.
#3335, #3617, #3708: The COUCHDB_FAUXTON_DOCROOT environment variable is now introduced to allow its explicit overriding at startup.
#3471: http clients should no longer receive stacktraces unexpectedly.
#3491: libicu tests no longer fail on older OS releases such as CentOS 6 and 7.
#3541: Usernames and passwords can now contain @ and not break the CouchDB replicator.
#3545: The dreyfus_index_manager process now supports offheap message queues.
#3551: The replication worker pool now properly cleans up worker processes as they are done via the worker_trap_exits = false setting.
#3633, #3631: All code paths for creating databases now fully respect db creation options, including partitioning options.
#3424, #3362: When using latest=true and an old revision with conflicting children as rev is specified, CouchDB no longer returns an "error": "case_clause" response.
#3673: Non-existent attachments now return a 404 when the attachment is missing.
#3698: The dev/run development script now allows clusters where n > 5.
#3700: The maybe_close message is now sent to the correct internal process.
#3183: The smoosh operator guide now recommends to use the rpc:multicall function.
#3712: Including a payload within a DELETE operation no longer hangs the next request made to the same mochiweb acceptor.
#3715: For clusters with databases where n > [cluster] n, attachments chunks are longer dropped on quorum writes.
#3507: If a file is truncated underneath CouchDB, CouchDB will now log the filename if it finds this situation with a file_truncate_error.
#3739: Shards with large purge sequences no longer fail to split in a shard splitting job.
#3754: Always return views meta info when limit=0 and sorted=true.
#3757: Properly sort descending=true view results with a keys list.
#3763: Stabilize view row sorting order when they are merged by the coordinator.

1.1.1.4. Other

Donuts for everyone! Er, not really - thank you for reading the 3.2 release notes.