SET @start_global_value = @@global.ROCKSDB_ALLOW_CONCURRENT_MEMTABLE_WRITE;
SELECT @start_global_value;
@start_global_value
0
"Trying to set variable @@global.ROCKSDB_ALLOW_CONCURRENT_MEMTABLE_WRITE to 444. It should fail because it is readonly."
SET @@global.ROCKSDB_ALLOW_CONCURRENT_MEMTABLE_WRITE   = 444;
ERROR HY000: Variable 'rocksdb_allow_concurrent_memtable_write' is a read only variable
