about rbd journaling

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Hi all,
   I found the rbd journaling first send data to journal pool (in
append_io_event, and return a future
  by journaler append) and then(when the append is safe) send to the
real data pool.
   Can someone explain a little more on this. I do not why doing this,
why not first to data pool,
   then to the journal pool?  May be put data first in journal pool
will let the rbd-mirror sync first?

Thanks a lot




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谦谦君子
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