Commit Graph

330 Commits

Author SHA1 Message Date
Shlomi Noach
879b2b425e - Support for --postpone-swap-tables-flag-file: while this file exists, final table swap does not take place, and the ghost table keeps being synchronized
- Fixed version printing
- `rowCopyCompleteFlag` is a hint that allows us to escape the infinite loop of rowcopy once we are sure we have reached the end
2016-05-17 14:40:37 +02:00
Shlomi Noach
065d9c40ec some messagages are now Info instead of Debug 2016-05-17 11:57:43 +02:00
Shlomi Noach
9d055dbda7 renaming to gh-ost 2016-05-16 11:09:17 +02:00
Shlomi Noach
1e10f1f29e Solved various race conditions:
- Operation would terminate after events lock noticed but before applying all events: race condition where the event would be captured asynchronously. The event is now handled sequentially with the DML events, hence now safe.
- Multiple rowcopy operations would still write to `rowCopyComplete` channel. This is still the case, but now we only wait for the first and then just flush (read and discard) any others, to avoid blocking
- Events DML listener is only added after table creation: the problem was that with very busy tables, the events func buffer would fill up, and the "tables-created" event would be blocked.
- `waitForEventsUpToLock()` unifies the waiting on all variants of complete-migration
- With `--test-on-replica`, now stopping replication "nicely", using `master_pos_wait()`
- With `--test-on-replica`, not throttling on replication after replication is stopped (duh)
- More debug output
2016-05-16 11:03:15 +02:00
Shlomi Noach
134bf385fd initial, simple solution to our-of-order applying of DML events 2016-05-05 17:14:55 +03:00
Shlomi Noach
6528010742 Adding ETA starting at 2% progress 2016-05-05 09:18:19 +03:00
Shlomi Noach
800c1109b0 fixed statistics query: getting the correct column names by unique key 2016-05-04 09:50:00 +03:00
Shlomi Noach
74d8b06db1 exact-rowcount implices updating number of rows as we make progress 2016-05-04 08:23:34 +03:00
Shlomi Noach
36905d82e3 - supporting --initially-drop-old-table
- supporting `--initially-drop-ghost-table`
- validating existence of `old` and `ghost` before beginning operation
2016-05-03 12:55:17 +03:00
Shlomi Noach
07063a4181 - added throttle-control-replicas flag, a list of control replicas
- when `--test-on-replica`, the tested replica is implicitly a control replica
- added `replication-lag-query`, an alternate query to `SHOW SLAVE STATUS` to get replication lag
- throttling takes both the above into consideration
2016-05-01 21:36:36 +03:00
Shlomi Noach
421ab0fc83 woohoo, logic complete
- Introduced `SwapTablesTimeoutSeconds`; `RENAME` is limited by this timeout
- If `RENAME` fails (due to the above), we throttle and retry
- `SwapTablesAtomic()` sets `lock_wait_timeout` and notifies with connection id
- `GrabVoluntaryLock()` intentionally grabs (and later releases) voluntary lock. It notifies when it is taken and awaits instructions as for when it could be released.
- `IssueBlockingQueryOnVoluntaryLock()` does what it says. It notifies with its connection_id so that it can be easily traced
- `stopWritesAndCompleteMigrationOnMasterViaLock()` does the thang. Oh dear this was agonizing and the code is a pain to look at, though under the limitations I do believe it is as clean as I could hope for.
2016-04-22 19:46:34 -07:00
Shlomi Noach
1ed1b0d156 - quick-and-bumpy-swap-tables uses quicker swap tables, at the expense of a period where the table does not exist (non atomic renames)
- refactored lock-and-swap code, in preparation for atomic swap
2016-04-22 13:41:20 -07:00
Shlomi Noach
54c6d059b5 - quick-and-bumpy-swap-tables uses quicker swap tables, at the expense of a period where the table does not exist (non atomic renames)
- refactored lock-and-swap code, in preparation for atomic swap
2016-04-22 13:18:56 -07:00
Shlomi Noach
3c85298b77 - Better, fewer NOOP checks around the code
- Keeping track of `TotalDMLEventsApplied`
2016-04-19 04:25:32 -07:00
Shlomi Noach
eeffa701d6 - Added ok-to-drop-table flag
- Added `switch-to-rbr` flag; applying binlog format change if needed
- Using dedicated db instance for locking & renaming on applier (must be used from within same connection)
- Heartbeat now uses `time.RFC3339Nano`
- Swap tables works! Caveat: short table outage
- `--test-on-replica` works!
- retries: using `panicAbort`: from any goroutine, regardless of context, it is possible to terminate the operation
- Reintroduced changelog events listener on streamer. This is the correct implementation.
2016-04-18 10:57:18 -07:00
Shlomi Noach
a4ee80df13 - Building and applying queries from binlog event data!
- `INSERT`, `DELETE`, `UPDATE` statements
- support for `--noop`
- initial support for `--test-on-replica`. Verifying against `--allow-on-master`
- Changelog events no longer read from binlog stream, because reading it may be throttled, and we have to be able to keep reading the heartbeat and state events.
  They are now being read directly from table, mapping already-seen-events to avoid confusion
  Changlelog listener pools table in 2*frequency of heartbeat injection
2016-04-14 13:37:56 +02:00
Shlomi Noach
04525887f3 - Throttling-check is now an async routine running once per second
- Throttling variables protected by mutex
- Added `--throttle-additional-flag-file`: `operation pauses when this file exists; hint: keep default, use for throttling multiple gh-osc operations`
- ColumnList is not a `struct` which contains ordinal mapping
- More implicit write changelog + audit changelog
- builder now builds `DELETE` and `INSERT` queries from data it will eventually get from DML event
- Sanity check for binlog_row_image
- Restarting replication to be sure binlog settings apply
- Prepare for accepting `SIGHUP` (reloading configuration)
2016-04-11 17:27:16 +02:00
Shlomi Noach
80163b35b6 extracted on-throttle functions outside loop 2016-04-08 14:44:36 +02:00
Shlomi Noach
a1a34b8150 ongoing development:
- accepts --max-load
- accepts multiple conditions in --max-load
- throttle includes reason
- chunk-size sanity check
- change log state writes both in appending (history) mode and in replacing (current) mode
- more atomic checks
- inspecting ghost table columns, unique key
- comparing unique keys between tables; sanity
- intersecting columns between tables
- prettify status
- refactored throttle() and retries()
2016-04-08 14:35:06 +02:00
Shlomi Noach
75f68c0752 - row copy and row events are now handled by a single routine which prioritizes events over rowcopy
- Supporting `--throttle-file-flag`
- Printing status
- Supporting transactional table syntax
- code cleanup; refactoring
- proper use of atomic where required
- iterations are in changelog (erm... maybe too much)
- `LOCK TABLES`, `UNLOCK TABLES` working
2016-04-08 10:34:44 +02:00
Shlomi Noach
0e7b23e6fe - Creating an populating Changelog table
- Using heartbeat
- Throttling works based on heartbeat
- Refactored binlog_reader stuff. Now streaming events (into golang channel, which makes for nice buffering and throttling)
- Binlog table listeners work
- More Migrator logic; existing logic for waiting on `state` events (e.g. `TablesCreatedState`)
2016-04-07 15:57:12 +02:00
Shlomi Noach
4dd5a93ed7 - More work on go-mysql reader: now properly notes binlog coordinates as it makes progress
- Properly creating multiple BinlogEntry-ies when reading multi statement binlog event (Still todo: transactions)
2016-04-06 18:44:54 +02:00
Shlomi Noach
5deff2adb6 - working POC of row-copy iteration cycle
- initial work on table columns
- initial work on events streamer
2016-04-06 13:05:58 +02:00
Shlomi Noach
f771016bd5 . 2016-04-06 13:05:21 +02:00
Shlomi Noach
d8fefb3d6f exploded args on range query building; iteration works 2016-04-05 19:50:49 +02:00
Shlomi Noach
3583ab5dc5 beginning support for ranges and iteration. Still WIP 2016-04-05 09:14:22 +02:00
Shlomi Noach
ea0906f4e5 reading table (range) min/max values, right now according to hardcoded unique key 2016-04-04 18:19:46 +02:00
Shlomi Noach
937491674c adding applier, instance_key, instance_key_map 2016-04-04 15:30:49 +02:00
Shlomi Noach
cf87d16044 detecting master (includes sanity checks). Introducing Applier. Creating and altering ghost table 2016-04-04 15:29:02 +02:00
Shlomi Noach
c75cd998fb a bunch of 'inspector' initial tests on the replica 2016-04-04 12:27:51 +02:00