how does ceph handle object writes?

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Hi guys,
I wonder how does store objects. Consider the writing obj process,  IMO, osd first get obj data from client, then the primary osd get the data, store the data in journal(with sync) , after that the primary osd spray the obj to other replica osd simultaneously, and each replica osd will write the journal with sync and then reply to the primary osd. After recieving all the replies from replica osd,  primary osd will report the write op is finished. Is there anything wrong?
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