Somnath,
I suppose there is mandatory 'primary' collection and there might exist
several 'auxiliary' ones within the transaction. Hence all operations
act on the same primary collection and can optionally reference
additional collections(s), e.g. split_collection op. Two independent
operations on different transactions aren't allowed.
Disclaimer: Everything is IMHO based on brief code analysis.
Igor
On 15.07.2016 3:19, Somnath Roy wrote:
Hi Sage/Sam,
I am seeing we are using vector of collections within _txc_add_transaction() (https://github.com/ceph/ceph/blob/master/src/os/bluestore/BlueStore.cc#L5206). I always thought all ops within a transaction will be having same collection id.
What is the scenario (or use case) where we may have ops with different collection ids within a transaction.
Also, I saw in BlueStore we are storing the first_collection (https://github.com/ceph/ceph/blob/master/src/os/bluestore/BlueStore.h#L893) among these op->cid.
I couldn't understand the reason as only place we are using that to trim the collection cache during _txc_finish -> _osr_reap_done(). If there is multiple collections within a txc op , why only first one is used.
Thanks & Regards
Somnath
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