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Add postpone-cut-over-flag-file interactive command #1561

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A Pull Request should be associated with an Issue.

Related issue: #1560

Description

This PR enable specifying postpone-cut-over-flag-file via the interactive command.
This allows postponing the cut-over even after execution has started, eliminating the need to restart the process.

  • contributed code is using same conventions as original code
  • script/cibuild returns with no formatting errors, build errors or unit test errors.

Testing

After starting the gh-ost execution without postpone-cut-over-flag-file option, a second session is launched to send the postpone-cut-over-flag-file command.

First session:

$ ./bin/gh-ost --host=127.0.0.1 --user=root --password=my-secret-pw --database=dummy --table=employee --alter="MODIFY COLUMN id BIGINT" --allow-on-master --initially-drop-ghost-table --initially-drop-old-table --serve-socket-file=/tmp/ghost.sock --initially-drop-socket-file --execute
[2025/05/25 16:46:37] [info] binlogsyncer.go:191 create BinlogSyncer with config {ServerID:99999 Flavor:mysql Host:127.0.0.1 Port:3306 User:root Password: Localhost: Charset: SemiSyncEnabled:false RawModeEnabled:false TLSConfig:<nil> ParseTime:false TimestampStringLocation:UTC UseDecimal:true RecvBufferSize:0 HeartbeatPeriod:0s ReadTimeout:0s MaxReconnectAttempts:0 DisableRetrySync:false VerifyChecksum:false DumpCommandFlag:0 Option:<nil> Logger:0xc00038a1e0 Dialer:0x76bc00 RowsEventDecodeFunc:<nil> TableMapOptionalMetaDecodeFunc:<nil> DiscardGTIDSet:false EventCacheCount:10240 SynchronousEventHandler:<nil>}
[2025/05/25 16:46:37] [info] binlogsyncer.go:443 begin to sync binlog from position (binlog.000002, 583132108)
[2025/05/25 16:46:37] [info] binlogsyncer.go:409 Connected to mysql 8.0.40 server
[2025/05/25 16:46:37] [info] binlogsyncer.go:868 rotate to (binlog.000002, 583132108)
# Migrating `dummy`.`employee`; Ghost table is `dummy`.`_employee_gho`
# Migrating a83c44d9d62a:3306; inspecting a83c44d9d62a:3306; executing on thinkahashi
# Migration started at Sun May 25 16:46:37 +0900 2025
# chunk-size: 1000; max-lag-millis: 1500ms; dml-batch-size: 10; max-load: ; critical-load: ; nice-ratio: 0.000000
# throttle-additional-flag-file: /tmp/gh-ost.throttle
# Serving on unix socket: /tmp/ghost.sock
Copy: 0/1108847 0.0%; Applied: 0; Backlog: 0/1000; Time: 0s(total), 0s(copy); streamer: binlog.000002:583135811; Lag: 0.04s, HeartbeatLag: 0.04s, State: migrating; ETA: N/A
Copy: 0/1108847 0.0%; Applied: 0; Backlog: 0/1000; Time: 1s(total), 1s(copy); streamer: binlog.000002:583140368; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: N/A
Copy: 19000/1108847 1.7%; Applied: 0; Backlog: 0/1000; Time: 2s(total), 2s(copy); streamer: binlog.000002:585014381; Lag: 0.13s, HeartbeatLag: 0.04s, State: migrating; ETA: 1m55s
Copy: 47000/1108847 4.2%; Applied: 0; Backlog: 0/1000; Time: 3s(total), 3s(copy); streamer: binlog.000002:587775115; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 37s
Copy: 77000/1108847 6.9%; Applied: 0; Backlog: 0/1000; Time: 4s(total), 4s(copy); streamer: binlog.000002:590728197; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 34s
Copy: 108000/1108847 9.7%; Applied: 0; Backlog: 0/1000; Time: 5s(total), 5s(copy); streamer: binlog.000002:593772998; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 32s
Copy: 137000/1108847 12.4%; Applied: 0; Backlog: 0/1000; Time: 6s(total), 6s(copy); streamer: binlog.000002:596628412; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 33s
Copy: 165000/1108847 14.9%; Applied: 0; Backlog: 0/1000; Time: 7s(total), 7s(copy); streamer: binlog.000002:599388356; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 33s
2025-05-25 16:46:44 ERROR User commanded 'postpone-cut-over-flag-file' without specifying file path
Copy: 194000/1108847 17.5%; Applied: 0; Backlog: 0/1000; Time: 8s(total), 8s(copy); streamer: binlog.000002:602251532; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 31s
Copy: 221000/1108847 19.9%; Applied: 0; Backlog: 0/1000; Time: 9s(total), 9s(copy); streamer: binlog.000002:604909622; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 32s
Copy: 248000/1108847 22.4%; Applied: 0; Backlog: 0/1000; Time: 10s(total), 10s(copy); streamer: binlog.000002:607570475; Lag: -6.26s, HeartbeatLag: 0.04s, State: migrating; ETA: 31s
Copy: 279000/1108847 25.2%; Applied: 0; Backlog: 0/1000; Time: 11s(total), 11s(copy); streamer: binlog.000002:610622068; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 26s
Copy: 309000/1108847 27.9%; Applied: 0; Backlog: 0/1000; Time: 12s(total), 12s(copy); streamer: binlog.000002:613578989; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 26s
Copy: 338000/1108847 30.5%; Applied: 0; Backlog: 0/1000; Time: 13s(total), 13s(copy); streamer: binlog.000002:616438109; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 26s
Copy: 366000/1108847 33.0%; Applied: 0; Backlog: 0/1000; Time: 14s(total), 14s(copy); streamer: binlog.000002:619198318; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 26s
Copy: 395000/1108847 35.6%; Applied: 0; Backlog: 0/1000; Time: 15s(total), 15s(copy); streamer: binlog.000002:622054019; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 24s
Copy: 417000/1108847 37.6%; Applied: 0; Backlog: 0/1000; Time: 16s(total), 16s(copy); streamer: binlog.000002:624220796; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 31s
Copy: 448000/1108847 40.4%; Applied: 0; Backlog: 0/1000; Time: 17s(total), 17s(copy); streamer: binlog.000002:627281184; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 21s
# Migrating `dummy`.`employee`; Ghost table is `dummy`.`_employee_gho`
# Migrating a83c44d9d62a:3306; inspecting a83c44d9d62a:3306; executing on thinkahashi
# Migration started at Sun May 25 16:46:37 +0900 2025
# chunk-size: 1000; max-lag-millis: 1500ms; dml-batch-size: 10; max-load: ; critical-load: ; nice-ratio: 0.000000
# throttle-additional-flag-file: /tmp/gh-ost.throttle
# postpone-cut-over-flag-file: /tmp/postpone.flag [set]
# Serving on unix socket: /tmp/ghost.sock
Copy: 449000/1108847 40.5%; Applied: 0; Backlog: 0/1000; Time: 17s(total), 17s(copy); streamer: binlog.000002:627281533; Lag: 0.03s, HeartbeatLag: 0.06s, State: migrating; ETA: 21s
Copy: 477000/1108847 43.0%; Applied: 0; Backlog: 0/1000; Time: 18s(total), 18s(copy); streamer: binlog.000002:630140181; Lag: 0.13s, HeartbeatLag: 0.14s, State: migrating; ETA: 21s
Copy: 507000/1108847 45.7%; Applied: 0; Backlog: 0/1000; Time: 19s(total), 19s(copy); streamer: binlog.000002:633098646; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 20s
Copy: 538000/1108847 48.5%; Applied: 0; Backlog: 0/1000; Time: 20s(total), 20s(copy); streamer: binlog.000002:636062230; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 18s
Copy: 560000/1108847 50.5%; Applied: 0; Backlog: 0/1000; Time: 21s(total), 21s(copy); streamer: binlog.000002:638326931; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 24s
Copy: 590000/1108847 53.2%; Applied: 0; Backlog: 0/1000; Time: 22s(total), 22s(copy); streamer: binlog.000002:641280010; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 17s
Copy: 614000/1108847 55.4%; Applied: 0; Backlog: 0/1000; Time: 23s(total), 23s(copy); streamer: binlog.000002:643640898; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 20s
Copy: 644000/1108847 58.1%; Applied: 0; Backlog: 0/1000; Time: 24s(total), 24s(copy); streamer: binlog.000002:646598050; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 15s
Copy: 675000/1108847 60.9%; Applied: 0; Backlog: 0/1000; Time: 25s(total), 25s(copy); streamer: binlog.000002:649655167; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 13s
Copy: 704000/1108847 63.5%; Applied: 0; Backlog: 0/1000; Time: 26s(total), 26s(copy); streamer: binlog.000002:652511593; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 13s
Copy: 726000/1108847 65.5%; Applied: 0; Backlog: 0/1000; Time: 27s(total), 27s(copy); streamer: binlog.000002:654682359; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 17s
Copy: 755000/1108847 68.1%; Applied: 0; Backlog: 0/1000; Time: 28s(total), 28s(copy); streamer: binlog.000002:657545144; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 12s
# Migrating `dummy`.`employee`; Ghost table is `dummy`.`_employee_gho`
# Migrating a83c44d9d62a:3306; inspecting a83c44d9d62a:3306; executing on thinkahashi
# Migration started at Sun May 25 16:46:37 +0900 2025
# chunk-size: 1000; max-lag-millis: 1500ms; dml-batch-size: 10; max-load: ; critical-load: ; nice-ratio: 0.000000
# throttle-additional-flag-file: /tmp/gh-ost.throttle
# postpone-cut-over-flag-file: /tmp/postpone.flag [set]
# Serving on unix socket: /tmp/ghost.sock
Copy: 764000/1108847 68.9%; Applied: 0; Backlog: 0/1000; Time: 28s(total), 28s(copy); streamer: binlog.000002:658430876; Lag: 0.03s, HeartbeatLag: 0.05s, State: migrating; ETA: 11s
Copy: 784000/1108847 70.7%; Applied: 0; Backlog: 0/1000; Time: 29s(total), 29s(copy); streamer: binlog.000002:660406061; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 11s
Copy: 812000/1108847 73.2%; Applied: 0; Backlog: 0/1000; Time: 30s(total), 30s(copy); streamer: binlog.000002:663166650; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 10s
Copy: 842000/1108847 75.9%; Applied: 0; Backlog: 0/1000; Time: 31s(total), 31s(copy); streamer: binlog.000002:666122993; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 8s
Copy: 865000/1108847 78.0%; Applied: 0; Backlog: 0/1000; Time: 32s(total), 32s(copy); streamer: binlog.000002:668388501; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 10s
Copy: 893000/1108847 80.5%; Applied: 0; Backlog: 0/1000; Time: 33s(total), 33s(copy); streamer: binlog.000002:671149707; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 7s
Copy: 924000/1108847 83.3%; Applied: 0; Backlog: 0/1000; Time: 34s(total), 34s(copy); streamer: binlog.000002:674200324; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 5s
Copy: 951000/1108847 85.8%; Applied: 0; Backlog: 0/1000; Time: 35s(total), 35s(copy); streamer: binlog.000002:676860051; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 5s
Copy: 980000/1108847 88.4%; Applied: 0; Backlog: 0/1000; Time: 36s(total), 36s(copy); streamer: binlog.000002:679715515; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 4s
Copy: 1010000/1108847 91.1%; Applied: 0; Backlog: 0/1000; Time: 37s(total), 37s(copy); streamer: binlog.000002:682572602; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 3s
Copy: 1028000/1108847 92.7%; Applied: 0; Backlog: 0/1000; Time: 38s(total), 38s(copy); streamer: binlog.000002:684376396; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 4s
Copy: 1058000/1108847 95.4%; Applied: 0; Backlog: 0/1000; Time: 39s(total), 39s(copy); streamer: binlog.000002:687403913; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: 1s
Copy: 1090000/1108847 98.3%; Applied: 0; Backlog: 0/1000; Time: 40s(total), 40s(copy); streamer: binlog.000002:690563339; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 41s(total), 40s(copy); streamer: binlog.000002:693616499; Lag: 0.03s, HeartbeatLag: 0.10s, State: migrating; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 41s(total), 40s(copy); streamer: binlog.000002:693617691; Lag: 0.03s, HeartbeatLag: 0.04s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 42s(total), 40s(copy); streamer: binlog.000002:693622326; Lag: 0.03s, HeartbeatLag: 0.04s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 43s(total), 40s(copy); streamer: binlog.000002:693626896; Lag: 0.03s, HeartbeatLag: 0.04s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 44s(total), 40s(copy); streamer: binlog.000002:693631463; Lag: 0.03s, HeartbeatLag: 0.04s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 45s(total), 40s(copy); streamer: binlog.000002:693635611; Lag: 0.13s, HeartbeatLag: 0.14s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 46s(total), 40s(copy); streamer: binlog.000002:693640179; Lag: 0.13s, HeartbeatLag: 0.14s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 47s(total), 40s(copy); streamer: binlog.000002:693645168; Lag: 0.03s, HeartbeatLag: 0.04s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 48s(total), 40s(copy); streamer: binlog.000002:693649317; Lag: 0.13s, HeartbeatLag: 0.14s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 49s(total), 40s(copy); streamer: binlog.000002:693653886; Lag: 0.13s, HeartbeatLag: 0.14s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 50s(total), 40s(copy); streamer: binlog.000002:693658095; Lag: 0.13s, HeartbeatLag: 0.14s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 51s(total), 40s(copy); streamer: binlog.000002:693662665; Lag: 0.13s, HeartbeatLag: 0.14s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 52s(total), 40s(copy); streamer: binlog.000002:693667652; Lag: 0.03s, HeartbeatLag: 0.04s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 53s(total), 40s(copy); streamer: binlog.000002:693671797; Lag: 0.13s, HeartbeatLag: 0.14s, State: postponing cut-over; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 1/1000; Time: 54s(total), 40s(copy); streamer: binlog.000002:693677890; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: due
# Migrating `dummy`.`employee`; Ghost table is `dummy`.`_employee_gho`
# Migrating a83c44d9d62a:3306; inspecting a83c44d9d62a:3306; executing on thinkahashi
# Migration started at Sun May 25 16:46:37 +0900 2025
# chunk-size: 1000; max-lag-millis: 1500ms; dml-batch-size: 10; max-load: ; critical-load: ; nice-ratio: 0.000000
# throttle-additional-flag-file: /tmp/gh-ost.throttle
# postpone-cut-over-flag-file: /tmp/postpone.flag
# Serving on unix socket: /tmp/ghost.sock
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 55s(total), 40s(copy); streamer: binlog.000002:693681608; Lag: 0.03s, HeartbeatLag: 0.11s, State: migrating; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 55s(total), 40s(copy); streamer: binlog.000002:693682800; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: due
Copy: 1121010/1121010 100.0%; Applied: 0; Backlog: 0/1000; Time: 56s(total), 40s(copy); streamer: binlog.000002:693687520; Lag: 0.03s, HeartbeatLag: 0.04s, State: migrating; ETA: due
[2025/05/25 16:47:29] [info] binlogsyncer.go:225 syncer is closing...
[2025/05/25 16:47:29] [info] binlogsyncer.go:988 kill last connection id 133
[2025/05/25 16:47:29] [info] binlogsyncer.go:255 syncer is closed
# Done

Second session:

$ echo postpone-cut-over-flag-file | nc -U /tmp/ghost.sock
User commanded 'postpone-cut-over-flag-file' without specifying file path

$ echo postpone-cut-over-flag-file=/tmp/postpone.flag | nc -U /tmp/ghost.sock
Postponed
# Migrating `dummy`.`employee`; Ghost table is `dummy`.`_employee_gho`
# Migrating a83c44d9d62a:3306; inspecting a83c44d9d62a:3306; executing on thinkahashi
# Migration started at Sun May 25 16:46:37 +0900 2025
# chunk-size: 1000; max-lag-millis: 1500ms; dml-batch-size: 10; max-load: ; critical-load: ; nice-ratio: 0.000000
# throttle-additional-flag-file: /tmp/gh-ost.throttle
# postpone-cut-over-flag-file: /tmp/postpone.flag [set]
# Serving on unix socket: /tmp/ghost.sock
Copy: 449000/1108847 40.5%; Applied: 0; Backlog: 0/1000; Time: 17s(total), 17s(copy); streamer: binlog.000002:627281533; Lag: 0.03s, HeartbeatLag: 0.06s, State: migrating; ETA: 21s

$ echo postpone-cut-over-flag-file=/tmp/postpone.flag | nc -U /tmp/ghost.sock
Postponed
# Migrating `dummy`.`employee`; Ghost table is `dummy`.`_employee_gho`
# Migrating a83c44d9d62a:3306; inspecting a83c44d9d62a:3306; executing on thinkahashi
# Migration started at Sun May 25 16:46:37 +0900 2025
# chunk-size: 1000; max-lag-millis: 1500ms; dml-batch-size: 10; max-load: ; critical-load: ; nice-ratio: 0.000000
# throttle-additional-flag-file: /tmp/gh-ost.throttle
# postpone-cut-over-flag-file: /tmp/postpone.flag [set]
# Serving on unix socket: /tmp/ghost.sock
Copy: 764000/1108847 68.9%; Applied: 0; Backlog: 0/1000; Time: 28s(total), 28s(copy); streamer: binlog.000002:658430876; Lag: 0.03s, HeartbeatLag: 0.05s, State: migrating; ETA: 11s

$ ls -l /tmp/postpone.flag
-rwxr-xr-x 1 yktakaha4 yktakaha4 0 May 25 16:46 /tmp/postpone.flag

$ rm /tmp/postpone.flag
rm: remove regular empty file '/tmp/postpone.flag'? y

@Copilot Copilot AI review requested due to automatic review settings May 25, 2025 07:58
Copilot
Copilot AI reviewed May 25, 2025
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Pull Request Overview

This PR adds support for the postpone-cut-over-flag-file interactive command, allowing users to postpone the cut-over phase by creating a flag file at runtime rather than on startup.

  • Introduces Server.createPostponeCutOverFlagFile and hooks it into the interactive command handler
  • Adds documentation for the new command in interactive-commands.md
  • Provides unit tests for the flag-file creation logic in server_test.go

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File Description
go/logic/server.go Added createPostponeCutOverFlagFile and interactive command handling for postponing cut-over
go/logic/server_test.go Added tests covering successful creation and idempotence of the postpone-flag file
doc/interactive-commands.md Documented the new postpone-cut-over-flag-file=<path> command
Comments suppressed due to low confidence (1)

go/logic/server_test.go:72

  • Consider adding a test case where createPostponeCutOverFlagFile is called with a path in a non-existent directory to assert that an appropriate error is returned.
func TestServerCreatePostponeCutOverFlagFile(t *testing.T) {

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@rashiq rashiq Awaiting requested review from rashiq rashiq is a code owner

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