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race conditions after SIGTERM


how can that script lead to a race condition where files
are not fully written to disk? that never happens if the
systemd-unit for the replication instance has
"ExecStopPost=/usr/bin/sleep 1" and waits a while

my only explaination is that mysqld returns after the SIGTERM
from systemd before all data are completly written in some racy
situations and so rsynced incompletly to the datadir of the
other instance

systemctl stop replication.service
systemctl stop mysqld.service
rsync $RSYNC_PARAMS /mysql_replication/ /mysql_data/
systemctl start replication.service
systemctl start mysqld.service

Description=MariaDB Replication

ExecStart=/usr/libexec/mysqld --defaults-file=/etc/my-replication.cnf --pid-file=/run/mysqld/mysqld_replication.pid
--socket=/var/lib/mysql/mysql_replication.sock --open-files-limit=30000 --basedir=/usr --user=mysql

140724 12:22:59 [Note] /usr/libexec/mysqld: Shutdown complete
140724 12:23:01 [Note] Plugin 'InnoDB' is disabled.
Cannot find checkpoint record at LSN (1,0x35767)
140724 12:23:01 [ERROR] mysqld: Aria recovery failed. Please run aria_chk -r on all Aria tables and delete all
aria_log.######## files
140724 12:23:01 [ERROR] Plugin 'Aria' init function returned error.
140724 12:23:01 [ERROR] Plugin 'Aria' registration as a STORAGE ENGINE failed.
140724 12:23:01 [Note] Plugin 'FEDERATED' is disabled.
140724 12:23:01 [Note] Plugin 'FEEDBACK' is disabled.
140724 12:23:01 [ERROR] Aria engine is not enabled or did not start. The Aria engine must be enabled to continue as
mysqld was configured with --with-aria-tmp-tables
140724 12:23:01 [ERROR] Aborting
140724 12:23:01 [Note] /usr/libexec/mysqld: Shutdown complete
140724 12:23:03 [Note] Plugin 'InnoDB' is disabled.
Cannot find checkpoint record at LSN (1,0x35767)

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