Summary
- Attempt at fixing the AutocompleteInTeam/empty_string test which is flaky on MySQL-5.6. This is likely an index_merge_intersection optimization issue. See https://community.mattermost.com/core/pl/uzgygwa9e3d4pns14ayfs7mobw
for more discussion. The fix here simply modifies the where clause to change the query plan so index_merge_intersection is not used, while also not introducing a temporary table or a filesort.
Ticket Link
- https://mattermost.atlassian.net/browse/MM-26837
* MM-27040: Fix flaky tests due to same UpdateAt timestamp
Update queries are not guaranteed to always update the row.
Since we are only bumping the UpdateAt timestamps, if 2 update
requests hit concurrently within the same millisecond, then one
is bound to fail.
We fix all cases in the codebase where we were updating the UpdateAt
field to not check for count != 1, but rather count > 1.
A similar fix was already done in 3f46cf6f60.
* Remove incorrect test
* Add team filters to search teams
Remove unneeded logs
Add team filters to search teams
* Use bool pointers for filters
Re-add include group constrained
Fix lint
Return the union of filters
* Fix direct/group channel false positives
* Move public structures to model package
* Expose CheckIntegrity as a local API method
* Remove extra file
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
* MM-26410 Allow moving channels into Favorites when they're favorited in prefs
* MM-26410 Fix management of Favorites category when updating preferences
* MM-26410 Add management of Favorites category when deleting preferences
* Address feedback 1
* Remove WHERE (1=1) from query
* Remove unnecessary sq.Expr
* Rewrite query to use left join
* Remove redundant where statement and add some more tests
* Fix linting issues
* Rename addChannelToFavoritesCategory to addChannelToFavoritesCategory
* Migrate command webhook store AppError to error
* Migrate command webhook store AppError to error
* Migrate command webhook store AppError to error
* Migrate command webhook store AppError to error
* Migrate command webhook store AppError to error
* Migrate command webhook store AppError to error
* Migrate command webhook store AppError to error
* Changes requested in the review.
* Changing http status
* fix i18n
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Agniva De Sarker <agnivade@yahoo.co.in>
* MM-26574 Add role filters to user search and get
* Add ability to get filtered user stats
Add support for include bots
* Add tests for user count with filters
Add tests
* Apply changes from code review
* Fix guest filtering
* Fix up tests related to guests
* Clean role names
* Trigger CI
* Trigger CI
* Configurable dev environment
* Add a bit of documentation
* fixing gofmt
* A bit more doc
* Using variable
* Adding license header
* Moving LDAP_DATA variable to the default-config.mk file
* Adding another docker-compose for the makefile to not brake anybody workflow
* Moving dejavu to the config
* Fixing docker-compose.makefile.yaml for dejavu
* Adding keycloak support to the dev environment
* Address PR review comments
* Removing minio from default docker images
* Changing the default version of mysql to the oldest supported (5.6)
* Change the restart option to no for the dev environment
* Fixing restart option
* Reverting unneded changes
* Restoring 5.7 to check if test passes
* Going back to 5.6 mysql image
* Fixing tests on mysql 5.6
* Skipping flaky test
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
* TokenStore migration to return plain errors
* Fix translations
* Fix: returned error is ignored and http.StatusBadRequest is always returned
* Fix
* Fix translations
* Suggestions
* Changed from BadRequest to NotFound
* Setting the correct http status
* Changed test to expect 404 status
* Fix error
* Remove use of Gorp in ChannelStore.GetAllChannelMembersForUser
In order to improve performance, we're removing gorp calls in the
most used queries in the platform and this is one of them
* MM-26753 Change CreateInitialSidebarCategories to only take a user ID
* MM-26753 Create initial sidebar categories on demand if migration hasn't ran
* Wait for sidebar categories to be loaded in case of replication lag
* parent 48256721c4 (#14358)
author Eli Yukelzon <reflog@gmail.com> 1585814774 +0300
committer Eli Yukelzon <reflog@gmail.com> 1589111022 +0300
Sidebar caregories implemented
Apply suggestions from code review
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>
Update store/sqlstore/channel_store.go
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>
Update store/sqlstore/channel_store.go
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>
code review suggestions
status messages
edge case
bugs...
timeout reverse
* MM-25126 Add a separate default sorting method for categories (#14575)
* MM-25158 Add user to initial sidebar categories when joining team (#14570)
* MM-25281 Place new categories in the correct position (#14609)
* MM-25277 Return channels that aren't in a category as part of the Channels/Direct Messages categories (#14601)
* MM-25276 Remove categories when leaving a team (#14600)
* Remove categories when leaving a team
* layers
* corrected cleanup function
* lint
* .
* corrected errors in postgres
* .
* MM-25280 Ensure that the "update category order" API call only contains real category IDs and isn't missing any IDs (#14626)
* Ensure that the "update category order" API call only contains real category IDs and isn't missing any IDs
* tests
* correct status code
* MM-25278 Change "update category" API to return 400 when changing unsupported fields (#14599)
* MM-25279 Change category migration to only populate channels in Favorites (#14627)
* MM-25157 Add API to delete custom categories (#14574)
* MM-25157 Add API to delete custom categories
* get categories fix
* maxorder fix
* Use correct websocket event when deleting category
* Fix tests and remove debug code
* Actually use the right websocket event this time
* test cleanup
* Update test for new category order
Co-authored-by: Eli Yukelzon <reflog@gmail.com>
* MM-24914 Various fixes for sidebar channel handling (#14756)
* Fix checking for channel membership when reordering channels
* Remove unique constraint on SidebarCategories
* Set column sizes for SidebarCategories and SidebarChannels tables
* Allow changing the sorting method for non-DM categories
* Fix nil pointers in error handling
* Fix orphaned channels from other team being returned in Channels category
* Fix non-orphaned channels being duplicated in the Channels category
* Remove unique constraint on SidebarChannels
* Fix category/name of favorites preferences
* Fix testSidebarChannelsMigration
* Rename err to nErr and appErr to err
* Fix channel order returned by GetSidebarCategories on MySQL
* Fix adding/removing favorites preferences
* Remove leftover TODO
* Change SidebarCategoryType enums to use full names (#14786)
* Change SidebarCategoryType enums to use full names
* Fix Channels constant
* Remove leftover debug code
* MM-24914 Fix updateCategory endpoint returning the wrong type (#14795)
* MM-24914 Make some changes to UpdateSidebarCategories (#14806)
* Fix orphaned DMs not always being returned
* MM-24914 Make some changes to UpdateSidebarCategories
* Run updateSidebarCategoryOrderT in a transaction
* Fix deleting SidebarChannels based on order of arguments to UpdateSidebarCategories
* bump for api testing
* bump for api testing
* Change CreateInitialSidebarCategories to return a plain error
* Change MigrateSidebarCategories to return a plain error
* Remove usage of UpdateColumns when updating sidebar categories (#14843)
* Remove usage of UpdateColumns when changing category order
* Add a random test case
* Remove usage of UpdateColumns when updating sidebar categories (#14843)
* Remove usage of UpdateColumns when changing category order
* Add a random test case
* Remove usage of UpdateColumns when updating sidebar categories (#14843)
* Remove usage of UpdateColumns when changing category order
* Add a random test case
* MM-26343 Make CreateInitialSidebarCategories idempotent (#14870)
* Fix bad merge
* Fix another bad merge
* Fix unintentionally removed i18n string
Co-authored-by: Eli Yukelzon <reflog@gmail.com>
* MM-19548: Add a deadlock retry function for SaveChannel
A deadlock has been seen to occur in the upsertPublicChannelT method
during bulk import.
Here is a brief excerpt:
*** (1) TRANSACTION:
TRANSACTION 3141, ACTIVE 1 sec inserting
INSERT INTO
PublicChannels(Id, DeleteAt, TeamId, DisplayName, Name, Header, Purpose)
VALUES
(?, ?, ?, ?, ?, ?, ?)
ON DUPLICATE KEY UPDATE
DeleteAt = ?,
TeamId = ?,
DisplayName = ?,
Name = ?,
Header = ?,
Purpose = ?
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 76 page no 4 n bits 104 index Name of table `mydb`.`PublicChannels` trx id 3141 lock_mode X locks gap before rec insert intention waiting
** (2) TRANSACTION:
TRANSACTION 3140, ACTIVE 1 sec inserting
mysql tables in use 1, locked 1
5 lock struct(s), heap size 1136, 3 row lock(s), undo log entries 2
MySQL thread id 50, OS thread handle 140641523848960, query id 3226 172.17.0.1 mmuser update
INSERT INTO
PublicChannels(Id, DeleteAt, TeamId, DisplayName, Name, Header, Purpose)
VALUES
(?, ?, ?, ?, ?, ?, ?)
ON DUPLICATE KEY UPDATE
DeleteAt = ?,
TeamId = ?,
DisplayName = ?,
Name = ?,
Header = ?,
Purpose = ?
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 76 page no 4 n bits 104 index Name of table `mydb`.`PublicChannels` trx id 3140 lock_mode X locks gap before rec
*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 76 page no 4 n bits 104 index Name of table `mydb`.`PublicChannels` trx id 3140 lock_mode X locks gap before rec insert intention waiting
*** WE ROLL BACK TRANSACTION (1)
Following is my analysis:
From the deadlock output, it can be seen that it's due to a gap lock.
And that's clear because the index is Name which is a multi-column index using Name and TeamId.
But interestingly, both transactions seem to be inserting the same data, which is what is puzzling me.
The multi-column index on Name and TeamId will guarantee that they are always unique. And from looking at the code,
it does not seem possible to me that it will try to insert the same data from 2 different transactions.
But even if they do, why does tx 2 try to acquire the same lock again when it already has that ?
Here is what I think the order of events happening
Tx 2 gets a gap lock.
Tx 1 tries to get the same gap lock.
Tx 2 tries to again get the same gap lock ?
The last step is what is puzzling me. Why does an UPSERT statement acquire 2 gap locks ? From my reading of https://dev.mysql.com/doc/refman/8.0/en/innodb-locks-set.html:
> INSERT ... ON DUPLICATE KEY UPDATE differs from a simple INSERT in that an exclusive lock rather than a shared lock is placed on the row to be updated when a duplicate-key error occurs. An exclusive index-record lock is taken for a duplicate primary key value. An exclusive next-key lock is taken for a duplicate unique key value.
From what I understand, the expectation is that there will be one X lock and one gap lock is taken.
But that's not what the deadlock output seems to say.
The general advice on the internet seems to be that deadlocks will happen and not all of them can be understood.
For now, we add a generic deadlock retry function at the store package which can be reused by other queries too.
P.S.: This is a verbatim copy of my investigation posted at https://dba.stackexchange.com/questions/268652/mysql-deadlock-upsert-query-acquiring-gap-lock-twice
Testing:
This is ofcourse hard to test because it is impossible to reproduce this. I have tested this by manually returning an error
and confirming that it indeed retries.
WARN[2020-06-19T11:18:24.9585676+05:30] A deadlock happened. Retrying. caller="sqlstore/channel_store.go:568" error="Error 1213: mydeadlock"
WARN[2020-06-19T11:18:24.959158+05:30] A deadlock happened. Retrying. caller="sqlstore/channel_store.go:568" error="Error 1213: mydeadlock"
WARN[2020-06-19T11:18:24.9595072+05:30] A deadlock happened. Retrying. caller="sqlstore/channel_store.go:568" error="Error 1213: mydeadlock"
WARN[2020-06-19T11:18:24.9595451+05:30] Deadlock happened 3 times. Giving up caller="sqlstore/channel_store.go:579"
ERRO[2020-06-19T11:18:24.9596426+05:30] Unable to save channel. caller="mlog/log.go:175" err_details="Error 1213: mydeadlock" err_where=CreateChannel http_code=500 ip_addr="::1" method=POST path=/api/v4/channels request_id=745bsj13b7f6mnmsbn3t97grbw user_id=xcof1ipipbrfxpfjf6x4p6kx9e
* Fix tests
* MM-25890: Fix deadlock on deleting emoji reactions
A deadlock happens because `UPDATE_POST_HAS_REACTIONS_ON_DELETE_QUERY` is being called from 2 separate places.
1. From `DeleteAllWithEmojiName` where it's called as an independent query.
2. From `deleteReactionAndUpdatePost` where it's called as part of a transaction along with another DELETE query.
The deadlock occurs in such a scenario:
- tx #2 acquires an X lock from the DELETE query.
- tx #1 tries to acquire a S lock with the select query, but it's waiting for the X lock to be released from tx #2
- tx #2 now tries to acquire an S lock, but it can't because it is locked on tx #1.
Deadlock.
I have tested this and it does indeed deadlock. The root of the problem is that the Primary key is a multi-column index,
which means that a next-key lock has to be acquired to get a lock on the gap before the index.
Both the queries try to delete some reactions, and then select the new number of reactions. But they select different rows
due to which this happens.
This might just be an unavoidable deadlock due to the way the indexes are setup and next-key locks.
Unless we change the primary key to be a single-column index, it will be very hard to avoid this.
Therefore we just go with a simple retry.
* fix i18n
* address review comments
* address code review
* Fix scopelint
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
* Ensure time is different when second update operation occurs
* Change all sleeps to one ms
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
* MM-26203: Fix TestChannelStore//SearchAllChannels flake
Using random strings for channel names creates chances of collisions
when searching for specific strings.
We increase the search space increasing the size of the search string
to be searched. This reduces collisions and makes the tests more reliable.
For the "off-" family of tests, this probably needs more length. But
it would also need the tests to be changed slightly as the "off-" part
acts as a prefix. I accidentally stumbled upon it while running the test
50 times. Adding a "-" is probably good enough for now. We can revisit
if it fails again in CI.
* improved team_store tests too
* MM-24674 Update channel members by group to look at distinct autoTimezone and manualTimezone.
Instead of just doing a blanket distinct on the column since that returns more entries than expected
* Use JSON extract instead of parsing text
* Use single quotes in mysql query too
* Dont need to prepend users on unambiguous column
* Use json extract instead of shorthand
* Dont count timezone if timezone default length
* CI
Co-authored-by: mattermod <mattermod@users.noreply.github.com>
