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The systemd scripts packaged with MariaDB execute mysqld directly. This in turn prevents the --wsrep-recover and --wsrep-start-position mechanism from kicking in, as this mechanism is only found in mysqld_safe.
As a result, restarting a crashed mysqld via systemd will always cause SST to take place even if IST is available:
Jun 16 05:53:23 centos7 mysqld[3091]: 2016-06-16 5:53:23 140118583347328 [Note] WSREP: Assign initial position for certification: -1, protocol version: -1
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Jun 16 05:53:23 centos7 mysqld[3091]: 2016-06-16 5:53:23 140118583032576 [Warning] WSREP: Failed to prepare for incremental state transfer: Local state seqno is undefined: 1 (Operation not permitte
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Jun 16 05:53:23 centos7 mysqld[3091]: at galera/src/replicator_str.cpp:prepare_for_IST():491. IST will be unavailable.
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