rocksdb.2pc_group_commit failed in buildbot

rocksdb.2pc_group_commit                 w1 [ fail ]

        Test ended at 2017-11-20 11:53:01

CURRENT_TEST: rocksdb.2pc_group_commit

--- /usr/share/mysql/mysql-test/plugin/rocksdb/rocksdb/r/2pc_group_commit.result	2017-11-20 09:40:39.000000000 -0500

+++ /dev/shm/var/1/log/2pc_group_commit.reject	2017-11-20 11:53:00.808592240 -0500

@@ -40,7 +40,7 @@

 select IF(variable_value - @b2 between 100 and 5000, 'OK', 'FAIL') as Binlog_group_commits 

 from information_schema.global_status where variable_name='Binlog_group_commits';

 Binlog_group_commits

-OK

+FAIL

 select IF(variable_value - @b3 between 1 and 9000, 'OK', 'FAIL')

 from information_schema.global_status where variable_name='Rocksdb_wal_synced';

 IF(variable_value - @b3 between 1 and 9000, 'OK', 'FAIL')

mysqltest: Result length mismatch