Comment 6 for bug 1709495

Here is the excerpt of the log related to start of the XtraBackup process

{"log":"/usr/bin/xtrabackup version 2.4.8 based on MySQL server 5.7.13 Linux (x86_64) (revision id: 97330f7)\n","stream":"stderr","time":"2018-01-15T21:26:01.075981396Z"}
{"log":"xtrabackup: cd to /var/lib/mysql/\n","stream":"stderr","time":"2018-01-15T21:26:01.076032974Z"}
{"log":"xtrabackup: This target seems to be not prepared yet.\n","stream":"stderr","time":"2018-01-15T21:26:01.076055973Z"}
{"log":"InnoDB: Number of pools: 1\n","stream":"stderr","time":"2018-01-15T21:26:01.076276245Z"}
{"log":"xtrabackup: xtrabackup_logfile detected: size=15111028736, start_lsn=(4989581614901)\n","stream":"stderr","time":"2018-01-15T21:26:02.740604422Z"}
{"log":"xtrabackup: using the following InnoDB configuration for recovery:\n","stream":"stderr","time":"2018-01-15T21:26:02.741569031Z"}
{"log":"xtrabackup: innodb_data_home_dir = .\n","stream":"stderr","time":"2018-01-15T21:26:02.741585401Z"}
{"log":"xtrabackup: innodb_data_file_path = ibdata1:12M:autoextend\n","stream":"stderr","time":"2018-01-15T21:26:02.741590127Z"}
{"log":"xtrabackup: innodb_log_group_home_dir = .\n","stream":"stderr","time":"2018-01-15T21:26:02.741598946Z"}
{"log":"xtrabackup: innodb_log_files_in_group = 1\n","stream":"stderr","time":"2018-01-15T21:26:02.741604487Z"}
{"log":"xtrabackup: innodb_log_file_size = 15111028736\n","stream":"stderr","time":"2018-01-15T21:26:02.741619202Z"}
{"log":"xtrabackup: using the following InnoDB configuration for recovery:\n","stream":"stderr","time":"2018-01-15T21:26:02.741689111Z"}
{"log":"xtrabackup: innodb_data_home_dir = .\n","stream":"stderr","time":"2018-01-15T21:26:02.741694776Z"}
{"log":"xtrabackup: innodb_data_file_path = ibdata1:12M:autoextend\n","stream":"stderr","time":"2018-01-15T21:26:02.741698443Z"}
{"log":"xtrabackup: innodb_log_group_home_dir = .\n","stream":"stderr","time":"2018-01-15T21:26:02.741720873Z"}
{"log":"xtrabackup: innodb_log_files_in_group = 1\n","stream":"stderr","time":"2018-01-15T21:26:02.741726736Z"}
{"log":"xtrabackup: innodb_log_file_size = 15111028736\n","stream":"stderr","time":"2018-01-15T21:26:02.741729925Z"}
{"log":"xtrabackup: Starting InnoDB instance for recovery.\n","stream":"stderr","time":"2018-01-15T21:26:02.741733111Z"}
{"log":"xtrabackup: Using 99388227584 bytes for buffer pool (set by --use-memory parameter)\n","stream":"stderr","time":"2018-01-15T21:26:02.741737845Z"}
{"log":"InnoDB: PUNCH HOLE support available\n","stream":"stderr","time":"2018-01-15T21:26:02.741754754Z"}
{"log":"InnoDB: Mutexes and rw_locks use GCC atomic builtins\n","stream":"stderr","time":"2018-01-15T21:26:02.741770948Z"}
{"log":"InnoDB: Uses event mutexes\n","stream":"stderr","time":"2018-01-15T21:26:02.741775591Z"}
{"log":"InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier\n","stream":"stderr","time":"2018-01-15T21:26:02.74178021Z"}
{"log":"InnoDB: Compressed tables use zlib 1.2.8\n","stream":"stderr","time":"2018-01-15T21:26:02.741785883Z"}
{"log":"InnoDB: Number of pools: 1\n","stream":"stderr","time":"2018-01-15T21:26:02.741926008Z"}
{"log":"InnoDB: Using CPU crc32 instructions\n","stream":"stderr","time":"2018-01-15T21:26:02.742030712Z"}
{"log":"InnoDB: Initializing buffer pool, total size = 92.625G, instances = 1, chunk size = 128M\n","stream":"stderr","time":"2018-01-15T21:26:02.74275012Z"}
{"log":"InnoDB: Completed initialization of buffer pool\n","stream":"stderr","time":"2018-01-15T21:26:07.038679119Z"}
{"log":"InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().\n","stream":"stderr","time":"2018-01-15T21:26:08.114250467Z"}
{"log":"InnoDB: Highest supported file format is Barracuda.\n","stream":"stderr","time":"2018-01-15T21:26:08.128998517Z"}
{"log":"InnoDB: Log scan progressed past the checkpoint lsn 4989581614901\n","stream":"stderr","time":"2018-01-15T21:26:09.662206948Z"}
{"log":"InnoDB: Doing recovery: scanned up to log sequence number 4989586857472 (0%)\n","stream":"stderr","time":"2018-01-15T21:26:09.73807711Z"}