Port 12 use correct index test#16
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| "can query with range on secondary column", | ||
| "choose index with id", | ||
| "choose index with rev" | ||
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I'm not 100% sure these go here instead of search.elixir, confirmation would be appreciated, thanks
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refactor(basic-find-test): add sort to _find calls for limit and skip options
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…m Python to Elixir
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Changing file mode doesn't work on Windows ACLs with the settings from unix file systems. The erlang vm doesn't set it on Windows so that those tests fail. Exclude those tests when running on Windows.
put our AI/LLM disclaimer in the PR template
Update PULL_REQUEST_TEMPLATE.md
Previously, if users called the `_scheduler/docs` API at just the right moment, when a job would appear in the replicator doc processor ets table as `scheduled`, but it would not be in the replicator scheduler's ets table, users would see get function clause errors that look like this along with 500 HTTP response: ``` req_err(2666435525) unknown_error : function_clause [ <<"couch_replicator_httpd_util:update_db_name/1 L183">>, <<"couch_replicator_httpd:handle_scheduler_doc/3 L157">>, <<"chttpd:handle_req_after_auth/2 L432">>, ... ] ``` To fix it, explicitly handle this state as transitional pending state returning all the information we have about the job in the replicator doc processor.
`doc_lookup/3` could also return an `{ok, nil}` tuple if this is not the owner
node. We already expect it in the only place we call `doc_lookup/3` from but
the spec didn't have that case so we add it in here.
In the Explain output, bookmarks for queries on `text` (Search) indexes are added in their unpacked format to the options. This leads to at least two problems: - it is inconsistent with how empty bookmarks are rendered for `json` indexes, where the string `"nil"` is used, - for non-trivial bookmarks, contents cannot be translated by `jiffy:encode/1` to a JSON representation so that it will crash. Mitigate this issue by deferring the unpacking of bookmarks to the execution phase so that explain will get affected by that. Thanks @mojito317 for reporting this issue, and thanks @rnewson for revisiting my original fix and guiding me about it.
…rk-formatting fix(`mango`): formatting of `text` bookmarks in `_explain` output
Since we inspect the #full_doc_info{} record to skip deleted docs anyway, move
all the doc_id clauses to the `doc_fdi/3` callback to have one less callback to
worry about.
There is not performance penalty as by the time we call `doc_id/3` we already
have the full `#full_doc_info{}` record opened anyway.
In apache#5625 we introduced a BTree cache for dbs, and since view files also use BTrees, let's use a cache for them as well. This should help with concurrent view queries. I test the improvments I used k6 for benchmarking with a 1M doc, q=16 db, and a view with 10M rows. With a 400 rps request arrival rate saw more than a 50% improvement in average, p90, and p95 latencies: * Average: 14 -> 7 msec * Median: 12 -> 7 msec * P90 21 -> 10 msec * P95 27 -> 12 msec * Max 120 -> 77 msec Since view results could have large kp node values due to custom reduce functions, add max term limit for cache entries. To avoid adding yet another config value use a few multiple of BTree chunk size. This should help avoid config values clashing if users raise the chunk size but forget to raise their cache term limit (it would render the cache unusuable suddenly). More detailed test results along with a test at a higher depth of 4 to show further improvements. ``` BENCH_RATE=400 BENCH_DURATION=5m BENCH_VIEW_LIMIT=10 k6 run ./k6_couchdb_constant_arrival_view_query.js HTTP http_req_duration..............: avg=14.65ms min=2.08ms med=12.7ms max=120.08ms p(90)=20.53ms p(95)=26.78ms { expected_response:true }...: avg=14.65ms min=2.08ms med=12.7ms max=120.08ms p(90)=20.53ms p(95)=26.78ms { name:view_get }............: avg=14.65ms min=2.93ms med=12.7ms max=120.08ms p(90)=20.53ms p(95)=26.78ms http_req_failed................: 0.00% 0 out of 120002 http_reqs......................: 120002 399.891866/s ``` ``` $ BENCH_RATE=400 BENCH_DURATION=5m BENCH_VIEW_LIMIT=10 k6 run ./k6_couchdb_constant_arrival_view_query.js HTTP http_req_duration..............: avg=7.45ms min=2.38ms med=6.9ms max=77.78ms p(90)=10.21ms p(95)=11.5ms { expected_response:true }...: avg=7.45ms min=2.38ms med=6.9ms max=77.78ms p(90)=10.21ms p(95)=11.5ms { name:view_get }............: avg=7.45ms min=2.38ms med=6.9ms max=77.78ms p(90)=10.21ms p(95)=11.49ms http_req_failed................: 0.00% 0 out of 120004 http_reqs......................: 120004 399.799018/s ``` ``` $ BENCH_RATE=400 BENCH_DURATION=5m BENCH_VIEW_LIMIT=10 k6 run ./k6_couchdb_constant_arrival_view_query.js HTTP http_req_duration..............: avg=6.21ms min=2.22ms med=5.78ms max=77ms p(90)=8.4ms p(95)=9.5ms { expected_response:true }...: avg=6.21ms min=2.22ms med=5.78ms max=77ms p(90)=8.4ms p(95)=9.5ms { name:view_get }............: avg=6.21ms min=2.22ms med=5.78ms max=77ms p(90)=8.4ms p(95)=9.5ms http_req_failed................: 0.00% 0 out of 120003 http_reqs......................: 120003 399.931891/s ```
Build dev improvements
- If there is no checkpoint and no `since_seq`, then replicate from scratch. - If there is no checkpoint but `since_seq` is defined, then replicate with the `since_seq` field. - If both checkpoint and `since_seq` exist, use the checkpoint to replicate. - If the request includes `since_seq` field, the replication ID will be changed.
Previously we didn't handle the case when the "infinity" value was explicitly set in the config file. We only handled the case when it was the default value.
When debugging processes getting stuck in hibernation bug [1] a few benchmarks
showed that hibernation can be pretty expensive. I saw 20% or so reduction in
latency in couch_work_queue if we hibernate after every single item insertion.
Erlang documents warn about this [2]:
> Use this feature with care, as hibernation implies at least two garbage
collections (when hibernating and shortly after waking up) and is not something
you want to do between each call to a busy server.
In a few places like the `couch_work_queue` and `couch_db_updater` we did
exactly that. However, since we added that more Erlang/OTP implemented a new
`gen_server` option - `{hibernate_after, Timeout}`. It will trigger hibernation
after an idle time. That seems ideal for us - it keeps expensive hibernation
out of the main data path, as docs warn us about, but once the server goes idle
we still get to run it to dereference any ref binaries.
Since we encountered the recent hibernation bug [1] also add an option to
disable it altogether, just to have a way to mitigate the issue when running on
OTP 27 and 28 before the fix is out.
[1] erlang/otp#10651
[2] https://www.erlang.org/doc/apps/stdlib/gen_server.html
[3] apache@d9eb87f
Send 404 for /_all_dbs and /_dbs_info with extra path parts
There are two main improvements: 1) Remove dynamic runtime reloading. That feature is not useful any longer after we stopped doing online relups, and instead became a potential landmine that can lead to metrics unexpectedly faling if stats description files, or disk access to them changes at runtime. The only minor benefit previous behavior had was was for local dev/run development, coupled with online module reloading; but that hardly justifies the complexity and the confusion resulting from stats all of the sudden breaking in production. 2) Strengthen a few asserts during stats loading. Only accept missing stats description from applications, and stop on any other error. We don't want to run with stats missing or unloadable or constantly spewing "unknown metric" error.
Mango unit tests
…-arm ci: temporarily disable freebsd-arm worker because it is too slow
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