MySQL Data Dumper

Mydumper global lock problem on a Amazon RDS

Asked by Sergio D. Rodríguez Inclan

Hi,

I have a problem when executing mydumper on a RDS instance I got the message "(mydumper:30181): CRITICAL **: Couldn't acquire global lock, snapshots will not be consistent: Access denied for user..." why is that? I completed it tough, is there a valid why to perform the dump without the problem mentioned?

Thanks.

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Domas Mituzas (domas-mituzas) said : 		#1

RDS does not give you possibility to grab a global snapshot, so parallel consistent snapshots are not possible.
Either use single thread dump or standard mysqldump --single-transaction

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Max Bubenick (max-bubenick) said : 		#2

You can use --lock-all-tables, it will use lock table ... read; instead of FTWRL which is not allowed on RDS.

And for clarification the lock is only at the beginning to coordinate threads. And of course you also use --no-locks but the snapshot will not be consistent.

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