sds_bptree_transaction - Man Page

uint32_t checksum
uint32_t reference_count
sds_txn_state state
struct _sds_bptree_cow_instance * binst
struct _sds_bptree_instance * bi
uint64_t txn_id
sds_bptree_node_list * owned
sds_bptree_node_list * created
struct _sds_bptree_node * root
struct _sds_bptree_transaction * parent_txn
struct _sds_bptree_transaction * child_txn

Pointer to the b+tree instance that this transaction holds​.

Pointer to the cow b+tree instance that created us​.

Checksum of the data in this structure​.

The next transaction that derives from us​.

The list of nodes that this transaction "created"​. This is used during an abort of the txn to roll back any changes that we made​.

The list of nodes that this transaction "owns"​. When the reference count moves to 0, these nodes will be freed​. This list is created during a write transaction of "items that will not be needed when we are removed​."​.

IE, when we have a txn A, then a new transaction B is made, we "copy" node 1a to node 1b​. Node 1b is "created" by txn B, and node 1a is "owend" by txn A, because it's the last transaction that depends on this nodes existance​.

The previous transaction that we are derived from​.

Reference count to the number of consumers of this transaction​. This is atomically updated​. If this is the "active" primary transaction, this is guaranteed to be 1 or greater​. When a new write transaction is commited, if this reference count falls to 0, this transaction is implicitly destroy​.

The current root node​. Each transaction owns a unique root node which anchors the branches of the copy on write structure​.

The state of the transaction​. All transactions start as SDS_WRITE_TXN, and upon commit move to the SDS_READ_TXN state​.

The unique identifier of this transaction​.