[Tarantool-patches] [PATCH v2 03/19] txn: add TXN_WAIT_ACK flag

[Vladislav Shpilevoy <v.shpilevoy@tarantool.org>]

When a transaction touches a synchronous space, its commit
procedure changes. The transaction enters state of 'waiting for
acks' from replicas and from own master's WAL.

To denote the state there is a new transaction flag -
TXN_WAIT_ACK.

Part of #4844
---
 src/box/txn.c | 6 ++++++
 src/box/txn.h | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/src/box/txn.c b/src/box/txn.c
index 123520166..edc1f5180 100644
--- a/src/box/txn.c
+++ b/src/box/txn.c
@@ -495,6 +495,7 @@ txn_journal_entry_new(struct txn *txn)
 
 	struct xrow_header **remote_row = req->rows;
 	struct xrow_header **local_row = req->rows + txn->n_applier_rows;
+	bool is_sync = false;
 
 	stailq_foreach_entry(stmt, &txn->stmts, next) {
 		if (stmt->has_triggers) {
@@ -506,6 +507,9 @@ txn_journal_entry_new(struct txn *txn)
 		if (stmt->row == NULL)
 			continue;
 
+		is_sync = is_sync || (stmt->space != NULL &&
+				      stmt->space->def->opts.is_sync);
+
 		if (stmt->row->replica_id == 0)
 			*local_row++ = stmt->row;
 		else
@@ -513,6 +517,8 @@ txn_journal_entry_new(struct txn *txn)
 
 		req->approx_len += xrow_approx_len(stmt->row);
 	}
+	if (is_sync)
+		txn_set_flag(txn, TXN_WAIT_ACK);
 
 	assert(remote_row == req->rows + txn->n_applier_rows);
 	assert(local_row == remote_row + txn->n_new_rows);
diff --git a/src/box/txn.h b/src/box/txn.h
index 3f6d79d5c..232cc07a8 100644
--- a/src/box/txn.h
+++ b/src/box/txn.h
@@ -66,6 +66,13 @@ enum txn_flag {
 	TXN_CAN_YIELD,
 	/** on_commit and/or on_rollback list is not empty. */
 	TXN_HAS_TRIGGERS,
+	/**
+	 * Transaction, touched sync spaces, enters 'waiting for
+	 * acks' state before commit. In this state it waits until
+	 * it is replicated onto a quorum of replicas, and only
+	 * then finishes commit and returns success to a user.
+	 */
+	TXN_WAIT_ACK,
 };
 
 enum {
-- 
2.21.1 (Apple Git-122.3)