【Xtrabackup捉虫】Waiting for master thread to be suspended
使用xtrabackup 2.4.6版本，在备份完成后，prepare阶段（apply-log的时候）会抛出该提示：
-
xtrabackup: starting shutdown with innodb_fast_shutdown = 1
-
InnoDB: FTS optimize thread exiting.
-
InnoDB: Starting shutdown...
- InnoDB: Waiting for master thread to be suspended
- InnoDB: Waiting for master thread to be suspended
- InnoDB: Waiting for master thread to be suspended
- InnoDB: Waiting for master thread to be suspended
- InnoDB: Waiting for master thread to be suspended
- ………………………………
-
并且长时间等待仍然被hang住。
检查percona的bug库，发现这被判定为一个bug：
- https://bugs.launchpad.net/percona-xtrabackup/+bug/1671437
关于相关代码contributor的讨论如下：
- https://github.com/percona/percona-xtrabackup/pull/378
既然可能是bug，那么检查了一下当前最新的版本为2.4.8，检查relase note发现该bug已经得以修复：
重新下载并使用当前最新版本的xtrabackup即可解决：
- https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.4.8/binary/tarball/percona-xtrabackup-2.4.8-Linux-x86_64.tar.gz
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