Open SpencerMalone opened 1 year ago
We get a lot of issues caused by... Error 1213 (40001): Deadlock found when trying to get lock; try restarting transaction when mass migrating data, and I was trying to understand why the select locks are so aggressive.
Error 1213 (40001): Deadlock found when trying to get lock; try restarting transaction
I'm guessing that the locking in... https://github.com/Shopify/ghostferry/blob/master/cursor.go#L174-L176 is an implementation of around https://github.com/Shopify/ghostferry/blob/master/tlaplus/ghostferry.tla#L332-L354 in the design spec, and I was wondering if there was any reason we couldn't use a FOR SHARE / LOCK IN SHARE MODE in the cursor to reduce the write lock churn when migrating lots of pieces of data at once? This issue is half bug / half feature request / half question, but the IRC seemed pretty empty when I poked at it, so I figured I'd broach the subject here.
FOR SHARE
LOCK IN SHARE MODE
We get a lot of issues caused by...
Error 1213 (40001): Deadlock found when trying to get lock; try restarting transactionwhen mass migrating data, and I was trying to understand why the select locks are so aggressive.I'm guessing that the locking in... https://github.com/Shopify/ghostferry/blob/master/cursor.go#L174-L176 is an implementation of around https://github.com/Shopify/ghostferry/blob/master/tlaplus/ghostferry.tla#L332-L354 in the design spec, and I was wondering if there was any reason we couldn't use a
FOR SHARE/LOCK IN SHARE MODEin the cursor to reduce the write lock churn when migrating lots of pieces of data at once? This issue is half bug / half feature request / half question, but the IRC seemed pretty empty when I poked at it, so I figured I'd broach the subject here.