MDEV-22193 Avoid un-necessary page initialization during recovery

- InnoDB is doing un-necessary redo log page initialisation during
recovery and unnecessary traversal of redo log during last phase.
This patch does the optimization of removing unnecessary redo log page
initialisation and detects the memory exhaust earlier.

extra/mariabackup/xtrabackup.cc

@@ -2641,7 +2641,8 @@ static lsn_t xtrabackup_copy_log(lsn_t start_lsn, lsn_t end_lsn, bool last)
 		}
 	}
 
-	if (more_data && recv_sys.parse(0, STORE_NO, false)) {
+	store_t store= STORE_NO;
+	if (more_data && recv_sys.parse(0, &store, false)) {
 		msg("Error: copying the log failed");
 		return(0);
 	}

storage/innobase/include/log0recv.h

@@ -356,7 +356,7 @@ public:
   @param apply           whether to apply file-level log records
   @return whether FILE_CHECKPOINT record was seen the first time,
   or corruption was noticed */
-  bool parse(lsn_t checkpoint_lsn, store_t store, bool apply);
+  bool parse(lsn_t checkpoint_lsn, store_t *store, bool apply);
 
   /** Clear a fully processed set of stored redo log records. */
   inline void clear();

storage/innobase/log/log0recv.cc

@@ -1771,13 +1771,14 @@ append:
 @param apply           whether to apply file-level log records
 @return whether FILE_CHECKPOINT record was seen the first time,
 or corruption was noticed */
-bool recv_sys_t::parse(lsn_t checkpoint_lsn, store_t store, bool apply)
+bool recv_sys_t::parse(lsn_t checkpoint_lsn, store_t *store, bool apply)
 {
   ut_ad(log_mutex_own());
   ut_ad(mutex_own(&mutex));
   ut_ad(parse_start_lsn);
   ut_ad(log_sys.is_physical());
 
+  bool last_phase= (*store == STORE_IF_EXISTS);
   const byte *const end= buf + len;
 loop:
   const byte *const log= buf + recovered_offset;
@@ -2073,13 +2074,13 @@ same_page:
       }
 #endif
       const bool is_init= (b & 0x70) <= INIT_PAGE;
-      switch (store) {
+      switch (*store) {
       case STORE_IF_EXISTS:
         if (!fil_space_get_size(space_id))
           continue;
         /* fall through */
       case STORE_YES:
-        if (is_init || !mlog_init.will_avoid_read(id, start_lsn))
+        if (!mlog_init.will_avoid_read(id, start_lsn))
           add(id, start_lsn, end_lsn, recs,
               static_cast<size_t>(l + rlen - recs));
         continue;
@@ -2089,12 +2090,7 @@ same_page:
         map::iterator i= pages.find(id);
         if (i == pages.end())
           continue;
-        if ((*static_cast<const log_phys_t*>(*i->second.log.begin())->begin() &
-             0x70) <= INIT_PAGE)
-        {
-          ut_ad(i->second.state == page_recv_t::RECV_WILL_NOT_READ);
-          continue;
-        }
+        i->second.log.clear();
         pages.erase(i);
         mlog_init.add(id, start_lsn);
       }
@@ -2216,6 +2212,8 @@ same_page:
   ut_ad(l == el);
   recovered_offset= l - buf;
   recovered_lsn= end_lsn;
+  if (is_memory_exhausted(store) && last_phase)
+    return false;
   goto loop;
 }
 
@@ -2994,7 +2992,7 @@ static bool recv_scan_log_recs(
 
 	if (more_data && !recv_sys.found_corrupt_log) {
 		/* Try to parse more log records */
-		if (recv_sys.parse(checkpoint_lsn, *store, apply)) {
+		if (recv_sys.parse(checkpoint_lsn, store, apply)) {
 			ut_ad(recv_sys.found_corrupt_log
 			      || recv_sys.found_corrupt_fs
 			      || recv_sys.mlog_checkpoint_lsn