MDEV-7129 : Galera duplicate error on autoincrement field primary key

Merged fix for https://github.com/codership/mysql-wsrep/issues/18.

sql/wsrep_hton.cc

@@ -484,7 +484,8 @@ wsrep_run_wsrep_commit(THD *thd, handlerton *hton, bool all)
   case WSREP_BF_ABORT:
     DBUG_ASSERT(thd->wsrep_trx_meta.gtid.seqno != WSREP_SEQNO_UNDEFINED);
   case WSREP_TRX_FAIL:
-    WSREP_DEBUG("commit failed for reason: %d", rcode);
+    WSREP_DEBUG("commit failed for reason: %d %lu %s", rcode, thd->thread_id,
+                thd->query());
     DBUG_PRINT("wsrep", ("replicating commit fail"));
 
     thd->wsrep_query_state= QUERY_EXEC;

storage/innobase/handler/ha_innodb.cc

@@ -5901,6 +5901,14 @@ ha_innobase::write_row(
 #ifdef WITH_WSREP
 			/* workaround for LP bug #355000, retrying the insert */
 			case SQLCOM_INSERT:
+
+				WSREP_DEBUG("DUPKEY error for autoinc\n"
+				      "THD %ld, value %llu, off %llu inc %llu",
+				      wsrep_thd_thread_id(current_thd),
+				      auto_inc,
+				      prebuilt->autoinc_offset,
+				      prebuilt->autoinc_increment);
+
 				if (wsrep_on(current_thd)          &&
 				    auto_inc_inserted              &&
 				    wsrep_drupal_282555_workaround &&
@@ -7400,10 +7408,10 @@ wsrep_append_key(
 	DBUG_ENTER("wsrep_append_key");
 	bool const copy = true;
 #ifdef WSREP_DEBUG_PRINT
-	fprintf(stderr, "%s conn %ld, trx %llu, keylen %d, table %s ", 
+	fprintf(stderr, "%s conn %ld, trx %llu, keylen %d, table %s\n Query: %s ",
 		(shared) ? "Shared" : "Exclusive",
 		wsrep_thd_thread_id(thd), trx->id, key_len, 
-		table_share->table_name.str);
+		table_share->table_name.str, wsrep_thd_query(thd));
 	for (int i=0; i<key_len; i++) {
 		fprintf(stderr, "%hhX, ", key[i]);
 	}
@@ -11473,7 +11481,20 @@ ha_innobase::get_auto_increment(
 		next value in the series. */
 		if (prebuilt->autoinc_increment > increment) {
 
+#ifdef WITH_WSREP
+			WSREP_DEBUG("autoinc decrease: %llu -> %llu\n"
+				    "THD: %ld, current: %llu, autoinc: %llu", 
+				    prebuilt->autoinc_increment,
+				    increment,
+				    wsrep_thd_thread_id(ha_thd()),
+				    current, autoinc);
+			if (!wsrep_on(ha_thd()))
+			{
+#endif /* WITH_WSREP */
 			current = autoinc - prebuilt->autoinc_increment;
+#ifdef WITH_WSREP
+			}
+#endif /* WITH_WSREP */
 
 			current = innobase_next_autoinc(
 				current, 1, increment, 1, col_max_value);

storage/xtradb/handler/ha_innodb.cc

@@ -6871,6 +6871,14 @@ ha_innobase::write_row(
 #ifdef WITH_WSREP
 			/* workaround for LP bug #355000, retrying the insert */
 			case SQLCOM_INSERT:
+
+				WSREP_DEBUG("DUPKEY error for autoinc\n"
+				      "THD %ld, value %llu, off %llu inc %llu",
+				      wsrep_thd_thread_id(current_thd),
+				      auto_inc,
+				      prebuilt->autoinc_offset,
+				      prebuilt->autoinc_increment);
+
 				if (wsrep_on(current_thd)          &&
 				    auto_inc_inserted              &&
 				    wsrep_drupal_282555_workaround &&
@@ -8443,10 +8451,10 @@ wsrep_append_key(
 	DBUG_ENTER("wsrep_append_key");
 	bool const copy = true;
 #ifdef WSREP_DEBUG_PRINT
-	fprintf(stderr, "%s conn %ld, trx %llu, keylen %d, table %s ", 
+	fprintf(stderr, "%s conn %ld, trx %llu, keylen %d, table %s\n Query: %s ",
 		(shared) ? "Shared" : "Exclusive",
 		wsrep_thd_thread_id(thd), trx->id, key_len, 
-		table_share->table_name.str);
+		table_share->table_name.str, wsrep_thd_query(thd));
 	for (int i=0; i<key_len; i++) {
 		fprintf(stderr, "%hhX, ", key[i]);
 	}
@@ -12591,7 +12599,20 @@ ha_innobase::get_auto_increment(
 		next value in the series. */
 		if (prebuilt->autoinc_increment > increment) {
 
+#ifdef WITH_WSREP
+			WSREP_DEBUG("autoinc decrease: %llu -> %llu\n"
+				    "THD: %ld, current: %llu, autoinc: %llu", 
+				    prebuilt->autoinc_increment,
+				    increment,
+				    wsrep_thd_thread_id(ha_thd()),
+				    current, autoinc);
+			if (!wsrep_on(ha_thd()))
+			{
+#endif /* WITH_WSREP */
 			current = autoinc - prebuilt->autoinc_increment;
+#ifdef WITH_WSREP
+			}
+#endif /* WITH_WSREP */
 
 			current = innobase_next_autoinc(
 				current, 1, increment, 1, col_max_value);