CephFS MDS journal

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Hello,

I'm a bit confused about how the journaling actually works in the MDS. 

I was reading about these two configuration parameters (journal write head interval)  and (mds early reply). Does the MDS flush the journal synchronously after each operation? and by setting mds eary reply to true it allows operations to return without flushing. If so, what the other parameter (journal write head interval) do or isn't it for MDS?. Also, can all operations return without flushing with the mds early reply or is it specific to a subset of operations?.

Another question, are open operations also written to the journal?

Regards,
Mahmoud

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