[Tarantool-patches] [PATCH 8/8] replication: write and read CONFIRM entries

[Serge Petrenko]

09.06.2020 15:20, Serge Petrenko пишет:
> Make txn_limbo write a CONFIRM entry as soon as a batch of entries
> receive their acks. CONFIRM entry is written to WAL and later replicated
> to all the replicas.
>
> Now replicas put synchronous transactions into txn_limbo and wait for
> corresponding confirmation entries to arrive and end up in their WAL
> before committing the transactions.
>
> Part-of #4847

New commit:

commit c3f2ad52947a894a3028aac5f4b974577419af3f
Author: Serge Petrenko <sergepetrenko at tarantool.org>
Date:   Mon Jun 22 21:04:48 2020 +0300

     fix for 'replication: write and read CONFIRM entries'

     Rename on_confirm trigger to on_confirm_written to look similar to
     on_rollback_written trigger, introduced later.

     Make txn_limbo_on_rollback trigger respect the newly-introduced 
rollback
     reasons in txn->signature. (Now there's no need to clear the trigger
     after WAL write success).

     Fix use of wrong parameters inside both triggers.

     [TO BE SQUASHED INTO THE PREVIOUS COMMIT]

diff --git a/src/box/applier.cc b/src/box/applier.cc
index 009962d3b..5703a0698 100644
--- a/src/box/applier.cc
+++ b/src/box/applier.cc
@@ -260,10 +260,10 @@ process_nop(struct request *request)
   * Confirms some of the txns waiting in txn_limbo.
   */
  static int
-applier_on_confirm(struct trigger *trig, void *data)
+applier_on_confirm_written(struct trigger *trig, void *event)
  {
-    (void) trig;
-    int64_t lsn = *(int64_t *)data;
+    (void) event;
+    int64_t lsn = *(int64_t *)trig->data;
      txn_limbo_read_confirm(&txn_limbo, lsn);
      return 0;
  }
@@ -308,7 +308,7 @@ process_confirm(struct request *request)
          diag_set(OutOfMemory, size, "region_alloc_object", "trig");
          return -1;
      }
-    trigger_create(trig, applier_on_confirm, lsn, NULL);
+    trigger_create(trig, applier_on_confirm_written, lsn, NULL);

      if (txn_begin_stmt(txn, NULL) != 0)
          return -1;
diff --git a/src/box/txn.c b/src/box/txn.c
index a50dfeaf1..bf17fd749 100644
--- a/src/box/txn.c
+++ b/src/box/txn.c
@@ -611,10 +611,14 @@ txn_commit_nop(struct txn *txn)
   * when tx is waiting for confirmation.
   */
  static int
-txn_limbo_on_rollback(struct trigger *trig, void *data)
+txn_limbo_on_rollback(struct trigger *trig, void *event)
  {
-    (void) trig;
-    struct txn_limbo_entry *entry = (struct txn_limbo_entry *) data;
+    (void) event;
+    struct txn *txn = (struct txn *) event;
+    /* Check whether limbo has performed the cleanup. */
+    if (txn->signature != TXN_SIGNATURE_ROLLBACK)
+        return 0;
+    struct txn_limbo_entry *entry = (struct txn_limbo_entry *) trig->data;
      txn_limbo_abort(&txn_limbo, entry);
      return 0;
  }

-- 
Serge Petrenko