Multi-object transaction support¶

Summary
This is for multi-object transaction support.

Owners

Li Wang (Ubuntukylin)
Yunchuan Wen (Ubuntukylin)
Name

Interested Parties
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Current Status
Please describe the current status of Ceph as it relates to this blueprint. Is there something that this replaces? Are there current features that are related?

Detailed Description
Allow client to define the following struct,
struct MultiObjectTransaction {
map<hobject_t, ObjectWriteOperation> object_ops;
hobject_t master;
};
and send a group of ops through MOSDOp to the PG coressponding to master object, call it master PG.

Work items
This section should contain a list of work tasks created by this blueprint. Please include engineering tasks as well as related build/release and documentation work. If this blueprint requires cleanup of deprecated features, please list those tasks as well.

Coding tasks
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Build / release tasks
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Documentation tasks
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Deprecation tasks
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