Blustore data consistency question when big write.

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when bluestore bigwrite it divided into two steps:
1, alloc a disk space and write data to it.
2, update the metadata to the database(rocksdb).

How to do data consistency?

Will the following error occur?
when write data to device sucess Osd process crushed .
But metadata is not update to rocksdb.

So I think there are legacy data in the disk,this can cause data
inconsistencies.
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