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add interface refresh_read_snaphost_tx_state for read latest

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chinaxing 2023-12-22 11:48:02 +00:00 committed by ob-robot
parent 2939bcb2af
commit ce48a373dd
2 changed files with 54 additions and 0 deletions
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38
src/storage/tx/ob_tx_api.cpp
View File

@ -2141,6 +2141,44 @@ bool ObTransService::tx_need_reset_(const int error_code) const
}
return ret;
}
int ObTransService::refresh_read_snapshot_tx_state(ObTxReadSnapshot &snapshot, const ObTxDesc &tx)
{
int ret = OB_SUCCESS;
if (snapshot.is_weak_read()) {
} else {
ObSpinLockGuard guard(tx.lock_);
if (tx.is_in_tx()) {
snapshot.core_.scn_ = tx.get_tx_seq();
if (tx.is_tx_active()) {
if (snapshot.is_ls_snapshot() && (snapshot.parts_.count() == 1 && snapshot.parts_.at(0).left_ == snapshot.snapshot_lsid_)) {
// skip refresh
} else if (snapshot.parts_.count() == tx.parts_.count()) {
// skip refresh, tx.parts_ will never be reduced
} else { // slow path
if (!snapshot.core_.tx_id_.is_valid()) {
snapshot.core_.tx_id_ = tx.tx_id_;
}
snapshot.parts_.reuse();
if (OB_FAIL(snapshot.parts_.reserve(tx.parts_.count()))) {
TRANS_LOG(WARN, "reserve space for snapshot's parts fail", K(ret), K(snapshot), K(tx));
} else {
ARRAY_FOREACH(tx.parts_, i) {
const ObTxPart &it = tx.parts_.at(i);
ret = snapshot.parts_.push_back(ObTxLSEpochPair(it.id_, it.epoch_));
}
}
if (TC_REACH_TIME_INTERVAL(100_ms)) {
TRANS_LOG(INFO, "[TxReadSnapshot] refresh tx state", K(snapshot), "tx_id", tx.tx_id_);
}
}
} else {
ret = OB_TRANS_HAS_DECIDED;
}
}
}
return ret;
}
} // transaction
} // namespace
#undef TXN_API_SANITY_CHECK_FOR_TXN_FREE_ROUTE

16
src/storage/tx/ob_tx_api.h
View File

@ -237,6 +237,22 @@ int get_ls_read_snapshot_version(const share::ObLSID &local_ls_id,
int get_weak_read_snapshot_version(const int64_t max_read_stale_time,
const bool local_single_ls,
share::SCN &snapshot_version);
/**
* refresh_read_snapshot_tx_state - update snapshot's tx state part
*
* @snapshot: the snapshot to refresh
* @tx: the target tx descriptor
*
* this interface try to update snapshot's tx state part by tx descriptor
* it was used by conflict checker which need read latest state of current
* transaction (while other read only read the data of before current stmt)
*
* Return:
* OB_SUCCESS - OK
* OB_HAS_DECIDED - transaction has terminated
* OB_XXX - unexpected error
*/
int refresh_read_snapshot_tx_state(ObTxReadSnapshot &snapshot, const ObTxDesc &tx);
/*
* release_snapshot - release snapshot
*