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I'm doing a simple test run locally with gh-ost.
./gh-ost
--max-load=Threads_running=25
--critical-load=Threads_running=1000
--chunk-size=1000
--max-lag-millis=1500
--user=<user>
--password=<password>
--host=localhost
--database=<db-name>
--table=<table-name>
--allow-on-master
--verbose '--alter=ADD COLUMN test_column INT'
--switch-to-rbr
--cut-over=default
--exact-rowcount
--concurrent-rowcount
--default-retries=120
--panic-flag-file=/tmp/ghost.panic.flag
--postpone-cut-over-flag-file=/tmp/ghost.postpone.flag
--executeThis appears to work fine, but I get these error messages:
Copy: 100000/100000 100.0%; Applied: 1; Backlog: 0/1000; Time: 2m20s(total), 23s(copy); streamer: mysql-bin.000001:43837497; Lag: 0.15s, State: postponing cut-over; ETA: due
Copy: 100000/100000 100.0%; Applied: 1; Backlog: 0/1000; Time: 2m25s(total), 23s(copy); streamer: mysql-bin.000001:43863861; Lag: 0.11s, State: postponing cut-over; ETA: due
Copy: 100000/100000 100.0%; Applied: 1; Backlog: 0/1000; Time: 2m30s(total), 23s(copy); streamer: mysql-bin.000001:43889675; Lag: 0.17s, State: postponing cut-over; ETA: due
2021-04-16 11:14:24 ERROR commands out of sync. Did you run multiple statements at once?
2021-04-16 11:14:24 ERROR commands out of sync. Did you run multiple statements at once?
Copy: 100000/100000 100.0%; Applied: 1; Backlog: 0/1000; Time: 2m35s(total), 23s(copy); streamer: mysql-bin.000001:43906779; Lag: 1.51s, State: postponing cut-over; ETA: due
2021-04-16 11:14:26 ERROR commands out of sync. Did you run multiple statements at once?
2021-04-16 11:14:26 ERROR commands out of sync. Did you run multiple statements at once?
Copy: 100000/100000 100.0%; Applied: 1; Backlog: 0/1000; Time: 2m40s(total), 23s(copy); streamer: mysql-bin.000001:43906779; Lag: 1.51s, State: postponing cut-over; ETA: due
Copy: 100000/100000 100.0%; Applied: 1; Backlog: 0/1000; Time: 2m45s(total), 23s(copy); streamer: mysql-bin.000001:43906779; Lag: 1.51s, State: postponing cut-over; ETA: due
Copy: 100000/100000 100.0%; Applied: 1; Backlog: 0/1000; Time: 2m55s(total), 23s(copy); streamer: mysql-bin.000001:43934664; Lag: 0.07s, State: postponing cut-over; ETA: due
Copy: 100000/100000 100.0%; Applied: 1; Backlog: 0/1000; Time: 3m0s(total), 23s(copy); streamer: mysql-bin.000001:43962657; Lag: 0.07s, State: postponing cut-over; ETA: due
Now what's odd with this is that there's almost no activity on my local environment, so I have no idea what statements this would referring to? I was running some selects again the _gho table, but that's it.
I couldn't find any other issues which lists this error, so I didn't find any other clues either.
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