Percona：备份准备不起作用（“无法打开 ./xtrabackup_logfile”）

Question

我已经通过 PerconaXtrabackup 工具创建了一个 MySQL 备份（感谢本指南）：

innobackupex --user=backupmysqluser --password=xyz --compress --stream=xbstream ./ > /var/backups/db/firstBackup.db

它成功创建了热备份。现在我想测试它的恢复情况，所以，首先，我解压它：

cd /var/backups/db
mkdir decompressed
xbstream -x -C decompressed

现在我试着准备它：

innobackupex --apply-log /var/backups/db/decompressed/

结果是这个错误：

160719 20:06:28 innobackupex: Starting the apply-log operation

IMPORTANT: Please check that the apply-log run completes successfully.
           At the end of a successful apply-log run innobackupex
           prints "completed OK!".

innobackupex version 2.4.3 based on MySQL server 5.7.11 Linux (x86_64) (revision id: 6a46905)
xtrabackup: cd to /var/backups/db/decompressed
xtrabackup: This target seems to be not prepared yet.
InnoDB: Number of pools: 1
InnoDB: Operating system error number 2 in a file operation.
InnoDB: The error means the system cannot find the path specified.
xtrabackup: Warning: cannot open ./xtrabackup_logfile. will try to find.
InnoDB: Operating system error number 2 in a file operation.
InnoDB: The error means the system cannot find the path specified.
  xtrabackup: Fatal error: cannot find ./xtrabackup_logfile.
xtrabackup: Error: xtrabackup_init_temp_log() failed.

这很奇怪，因为在decompressed文件夹中没有 xtrabackup_logfile，而是有一个名为的文件xtrabackup_logfile.qp。

我做错了什么？

Answer 1

如果 Xtrabackup 文件仍有.qp扩展名，则您尚未解压缩它们。

尝试在当前文件夹中使用它：

sudo innobackeupex --decompress --parallel=4

where4代表您要使用的线程数。

此外，事后清理：

sudo find ${DEST_DIR}/ -name "*.qp" -delete