WL 2826: Error handling of ALTER TABLE for partitioning

Make lots of fixes to handle the most complex case of reorganising
of partitions where two-phased processes are needed in some cases.


sql/ha_partition.cc:
  Rewrote the rename partitions and drop partitions to align with how
  the table log handles things.
sql/handler.h:
  Added new entry to partition_element to keep track of log entry for
  a partition during ALTER TABLE that reorganises existing partitions.
sql/mysql_priv.h:
  Converted 'd', 'e' and so forth to constants with somewhat more
  descriptive names
  Added method to inactivate log entries
sql/sql_partition.cc:
  Fix change of partitions
sql/sql_table.cc:
  More constants with somewhat descriptive names
  Moved around some methods between internal part and external part
  Added new method to handle inactivation of log entries

sql/ha_partition.cc

@@ -577,7 +577,6 @@ int ha_partition::create(const char *name, TABLE *table_arg,
 int ha_partition::drop_partitions(const char *path)
 {
   List_iterator<partition_element> part_it(m_part_info->partitions);
-  List_iterator<partition_element> temp_it(m_part_info->temp_partitions);
   char part_name_buff[FN_REFLEN];
   uint no_parts= m_part_info->partitions.elements;
   uint part_count= 0;
@@ -585,37 +584,18 @@ int ha_partition::drop_partitions(const char *path)
   uint i= 0;
   uint name_variant;
   int  error= 0;
-  bool reorged_parts= (m_reorged_parts > 0);
-  bool temp_partitions= (m_part_info->temp_partitions.elements > 0);
   DBUG_ENTER("ha_partition::drop_partitions");
 
-  if (temp_partitions)
-    no_parts= m_part_info->temp_partitions.elements;
   do
   {
-    partition_element *part_elem;
-    if (temp_partitions)
-    {
-      /*
-        We need to remove the reorganised partitions that were put in the
-        temp_partitions-list.
-      */
-      part_elem= temp_it++;
-      DBUG_ASSERT(part_elem->part_state == PART_TO_BE_DROPPED);
-    }
-    else
-      part_elem= part_it++;
-    if (part_elem->part_state == PART_TO_BE_DROPPED ||
-        part_elem->part_state == PART_IS_CHANGED)
+    partition_element *part_elem= part_it++;
+    if (part_elem->part_state == PART_TO_BE_DROPPED)
     {
       handler *file;
       /*
         This part is to be dropped, meaning the part or all its subparts.
       */
       name_variant= NORMAL_PART_NAME;
-      if (part_elem->part_state == PART_IS_CHANGED ||
-          (part_elem->part_state == PART_TO_BE_DROPPED && temp_partitions))
-        name_variant= RENAMED_PART_NAME;
       if (m_is_sub_partitioned)
       {
         List_iterator<partition_element> sub_it(part_elem->subpartitions);
@@ -627,10 +607,7 @@ int ha_partition::drop_partitions(const char *path)
           create_subpartition_name(part_name_buff, path,
                                    part_elem->partition_name,
                                    sub_elem->partition_name, name_variant);
-          if (reorged_parts)
-            file= m_reorged_file[part_count++];
-          else
-            file= m_file[part];
+          file= m_file[part];
           DBUG_PRINT("info", ("Drop subpartition %s", part_name_buff));
           error+= file->delete_table((const char *) part_name_buff);
         } while (++j < no_subparts);
@@ -640,10 +617,7 @@ int ha_partition::drop_partitions(const char *path)
         create_partition_name(part_name_buff, path,
                               part_elem->partition_name, name_variant,
                               TRUE);
-        if (reorged_parts)
-          file= m_reorged_file[part_count++];
-        else
-          file= m_file[i];
+        file= m_file[i];
         DBUG_PRINT("info", ("Drop partition %s", part_name_buff));
         error+= file->delete_table((const char *) part_name_buff);
       }
@@ -695,6 +669,14 @@ int ha_partition::rename_partitions(const char *path)
 
   if (temp_partitions)
   {
+    /*
+      These are the reorganised partitions that have already been copied.
+      We delete the partitions and log the delete by inactivating the
+      delete log entry in the table log. We only need to synchronise
+      these writes before moving to the next loop since there is no
+      interaction among reorganised partitions, they cannot have the
+      same name.
+    */
     do
     {
       part_elem= temp_it++;
@@ -705,39 +687,57 @@ int ha_partition::rename_partitions(const char *path)
         {
           sub_elem= sub_it++;
           file= m_reorged_file[part_count++];
-          create_subpartition_name(part_name_buff, path,
-                                   part_elem->partition_name,
-                                   sub_elem->partition_name,
-                                   RENAMED_PART_NAME);
           create_subpartition_name(norm_name_buff, path,
                                    part_elem->partition_name,
                                    sub_elem->partition_name,
                                    NORMAL_PART_NAME);
-          DBUG_PRINT("info", ("Rename subpartition from %s to %s",
-                     norm_name_buff, part_name_buff));
-          error+= file->rename_table((const char *) norm_name_buff,
-                                     (const char *) part_name_buff);
+          DBUG_PRINT("info", ("Delete subpartition %s", norm_name_buff));
+          if (file->delete_table((const char *) norm_name_buff) ||
+              inactivate_table_log_entry(sub_elem->log_entry->entry_pos))
+            error= 1;
+          else
+            sub_elem->log_entry= NULL; /* Indicate success */
         } while (++j < no_subparts);
       }
       else
       {
         file= m_reorged_file[part_count++];
-        create_partition_name(part_name_buff, path,
-                              part_elem->partition_name, RENAMED_PART_NAME,
-                              TRUE);
         create_partition_name(norm_name_buff, path,
                               part_elem->partition_name, NORMAL_PART_NAME,
                               TRUE);
-        DBUG_PRINT("info", ("Rename partition from %s to %s",
-                   norm_name_buff, part_name_buff));
-        error+= file->rename_table((const char *) norm_name_buff,
-                                   (const char *) part_name_buff);
+        DBUG_PRINT("info", ("Delete partition %s", norm_name_buff));
+        if (file->delete_table((const char *) norm_name_buff) ||
+            inactivate_table_log_entry(sub_elem->log_entry->entry_pos))
+          error= 1;
+        else
+          sub_elem->log_entry= NULL; /* Indicate success */
       }
     } while (++i < temp_partitions);
+    VOID(sync_table_log());
   }
   i= 0;
   do
   {
+    /*
+       When state is PART_IS_CHANGED it means that we have created a new
+       TEMP partition that is to be renamed to normal partition name and
+       we are to delete the old partition with currently the normal name.
+       
+       We perform this operation by
+       1) Delete old partition with normal partition name
+       2) Signal this in table log entry
+       3) Synch table log to ensure we have consistency in crashes
+       4) Rename temporary partition name to normal partition name
+       5) Signal this to table log entry
+       It is not necessary to synch the last state since a new rename
+       should not corrupt things if there was no temporary partition.
+
+       The only other parts we need to cater for are new parts that
+       replace reorganised parts. The reorganised parts were deleted
+       by the code above that goes through the temp_partitions list.
+       Thus the synch above makes it safe to simply perform step 4 and 5
+       for those entries.
+    */
     part_elem= part_it++;
     if (part_elem->part_state == PART_IS_CHANGED ||
         (part_elem->part_state == PART_IS_ADDED && temp_partitions))
@@ -759,14 +759,11 @@ int ha_partition::rename_partitions(const char *path)
           if (part_elem->part_state == PART_IS_CHANGED)
           {
             file= m_reorged_file[part_count++];
-            create_subpartition_name(part_name_buff, path,
-                                     part_elem->partition_name,
-                                     sub_elem->partition_name,
-                                     RENAMED_PART_NAME);
-            DBUG_PRINT("info", ("Rename subpartition from %s to %s",
-                       norm_name_buff, part_name_buff));
-            error+= file->rename_table((const char *) norm_name_buff,
-                                       (const char *) part_name_buff);
+            DBUG_PRINT("info", ("Delete subpartition %s", norm_name_buff));
+            if (file->delete_table((const char *) norm_name_buff) ||
+              inactivate_table_log_entry(sub_elem->log_entry->entry_pos))
+              error= 1;
+            VOID(synch_table_log());
           }
           file= m_new_file[part];
           create_subpartition_name(part_name_buff, path,
@@ -775,8 +772,12 @@ int ha_partition::rename_partitions(const char *path)
                                    TEMP_PART_NAME);
           DBUG_PRINT("info", ("Rename subpartition from %s to %s",
                      part_name_buff, norm_name_buff));
-          error+= file->rename_table((const char *) part_name_buff,
-                                     (const char *) norm_name_buff);
+          if (file->rename_table((const char *) norm_name_buff,
+                                 (const char *) part_name_buff) ||
+              inactivate_table_log_entry(sub_elem->log_entry->entry_pos))
+            error= 1;
+          else
+            sub_elem->log_entry= NULL;
         } while (++j < no_subparts);
       }
       else
@@ -787,13 +788,11 @@ int ha_partition::rename_partitions(const char *path)
         if (part_elem->part_state == PART_IS_CHANGED)
         {
           file= m_reorged_file[part_count++];
-          create_partition_name(part_name_buff, path,
-                                part_elem->partition_name, RENAMED_PART_NAME,
-                                TRUE);
-          DBUG_PRINT("info", ("Rename partition from %s to %s",
-                     norm_name_buff, part_name_buff));
-          error+= file->rename_table((const char *) norm_name_buff,
-                                     (const char *) part_name_buff);
+          DBUG_PRINT("info", ("Delete subpartition %s", norm_name_buff));
+          if (file->delete_table((const char *) norm_name_buff) ||
+            inactivate_table_log_entry(part_elem->log_entry->entry_pos))
+            error= 1;
+          VOID(synch_table_log());
         }
         file= m_new_file[i];
         create_partition_name(part_name_buff, path,
@@ -801,11 +800,16 @@ int ha_partition::rename_partitions(const char *path)
                               TRUE);
         DBUG_PRINT("info", ("Rename partition from %s to %s",
                    part_name_buff, norm_name_buff));
-        error+= file->rename_table((const char *) part_name_buff,
-                                  (const char *) norm_name_buff);
+        if (file->rename_table((const char *) norm_name_buff,
+                               (const char *) part_name_buff) ||
+            inactivate_table_log_entry(part_elem->log_entry->entry_pos))
+          error= 1;
+        else
+          part_elem->log_entry= NULL;
       }
     }
   } while (++i < no_parts);
+  VOID(synch_table_log());
   DBUG_RETURN(error);
 }
 

sql/handler.h

@@ -667,6 +667,7 @@ public:
   ulonglong part_min_rows;
   char *partition_name;
   char *tablespace_name;
+  TABLE_LOG_MEMORY_ENTRY *log_entry;
   longlong range_value;
   char* part_comment;
   char* data_file_name;
@@ -677,7 +678,8 @@ public:
   
   partition_element()
   : part_max_rows(0), part_min_rows(0), partition_name(NULL),
-    tablespace_name(NULL), range_value(0), part_comment(NULL),
+    tablespace_name(NULL), log_entry(0),
+    range_value(0), part_comment(NULL),
     data_file_name(NULL), index_file_name(NULL),
     engine_type(NULL),part_state(PART_NORMAL),
     nodegroup_id(UNDEF_NODEGROUP)

sql/mysql_priv.h

@@ -1177,6 +1177,8 @@ typedef struct st_table_log_entry
   uint next_entry;
   char action_type;
   char entry_type;
+  char phase;
+  char not_used;
 } TABLE_LOG_ENTRY;
 
 typedef struct st_table_log_memory_entry
@@ -1187,11 +1189,22 @@ typedef struct st_table_log_memory_entry
   struct st_table_log_memory_entry *next_active_log_entry;
 } TABLE_LOG_MEMORY_ENTRY;
 
+#define TLOG_EXECUTE_CODE 'e'
+#define TLOG_LOG_ENTRY_CODE 'l'
+#define TLOG_IGNORE_LOG_ENTRY_CODE 'i'
+
+#define TLOG_DELETE_ACTION_CODE 'd'
+#define TLOG_RENAME_ACTION_CODE 'r'
+#define TLOG_REPLACE_ACTION_CODE 's'
+
+#define TLOG_HANDLER_TYPE_LEN 32
+
 bool write_table_log_entry(TABLE_LOG_ENTRY *table_log_entry,
                            TABLE_LOG_MEMORY_ENTRY **active_entry);
 bool write_execute_table_log_entry(uint first_entry,
                                    bool complete,
                                    TABLE_LOG_MEMORY_ENTRY **active_entry);
+bool inactivate_table_log_entry(uint entry_no);
 void release_table_log_memory_entry(TABLE_LOG_MEMORY_ENTRY *log_entry);
 void release_table_log();
 void execute_table_log_recovery();

sql/sql_partition.cc

@@ -5135,9 +5135,9 @@ write_log_rename_delete_frm(ALTER_PARTITION_PARAM_TYPE *lpt,
   DBUG_ENTER("write_log_rename_frm");
 
   if (rename_flag)
-    table_log_entry.action_type= 'r';
+    table_log_entry.action_type= TLOG_RENAME_ACTION_CODE;
   else
-    table_log_entry.action_type= 'd';
+    table_log_entry.action_type= TLOG_DELETE_ACTION_CODE;
   table_log_entry.next_entry= next_entry;
   table_log_entry.handler_type= "frm";
   table_log_entry.name= to_path;
@@ -5160,6 +5160,18 @@ write_log_rename_delete_frm(ALTER_PARTITION_PARAM_TYPE *lpt,
   RETURN VALUES
     TRUE                     Error
     FALSE                    Success
+  DESCRIPTION
+    This code is used to perform safe ADD PARTITION for HASH partitions
+    and COALESCE for HASH partitions and REORGANIZE for any type of
+    partitions.
+    We prepare entries for all partitions except the reorganised partitions
+    in REORGANIZE partition, those are handled by
+    write_log_dropped_partitions. For those partitions that are replaced
+    special care is needed to ensure that this is performed correctly and
+    this requires a two-phased approach with this log as a helper for this.
+
+    This code is closely intertwined with the code in rename_partitions in
+    the partition handler.
 */
 
 static
@@ -5167,7 +5179,84 @@ bool
 write_log_changed_partitions(ALTER_PARTITION_PARAM_TYPE *lpt,
                              uint *next_entry, const char *path)
 {
+  TABLE_LOG_ENTRY table_log_entry;
+  partition_info *part_info= lpt->part_info;
+  TABLE_LOG_MEMORY_ENTRY *log_entry;
+  char tmp_path[FN_LEN];
+  char normal_path[FN_LEN];
+  List_iterator<partition_element> part_it(part_info->partitions);
+  uint temp_partitions= part_info->temp_partitions.elements;
+  uint no_elements= part_info->partitions.elements;
+  uint i= 0;
   DBUG_ENTER("write_log_changed_partitions");
+
+  do
+  {
+    partition_element *part_elem= part_it++;
+    if (part_elem->part_state == PART_IS_CHANGED ||
+        (part_elem->part_state == PART_IS_ADDED && temp_partitions))
+    {
+      if (is_sub_partitioned(part_info))
+      {
+        List_iterator<partition_element> sub_it(part_elem->subpartitions);
+        uint no_subparts= part_info->no_subparts;
+        uint j= 0;
+        do
+        {
+          partition_element *sub_elem= sub_it++;
+          table_log_entry.next_entry= *next_entry;
+          table_log_entry.handler_type=
+               ha_resolve_storage_engine_name(sub_elem->engine_type);
+          create_subpartition_name(tmp_path, path,
+                                   part_elem->partition_name,
+                                   sub_elem->partition_name,
+                                   TEMP_PART_NAME);
+          create_subpartition_name(normal_path, path,
+                                   part_elem->partition_name,
+                                   sub_elem->partition_name,
+                                   NORMAL_PART_NAME);
+          table_log_entry.name= norm_path;
+          table_log_entry.from_name= tmp_path;
+          if (part_elem->part_state == PART_IS_CHANGED)
+            table_log_entry->action_type= TLOG_REPLACE_ACTION_CODE;
+          else
+            table_log_entry->action_type= TLOG_RENAME_ACTION_CODE;
+          if (write_table_log_entry(&table_log_entry, &log_entry))
+          {
+            DBUG_RETURN(TRUE);
+          }
+          *next_entry= log_entry->entry_pos;
+          sub_elem->log_entry= log_entry;
+          insert_part_info_log_entry_list(part_info, log_entry);
+        } while (++j < no_subparts);
+      }
+      else
+      {
+        table_log_entry.next_entry= *next_entry;
+        table_log_entry.handler_type=
+               ha_resolve_storage_engine_name(part_elem->engine_type);
+        create_partition_name(tmp_path, path,
+                              part_elem->partition_name,
+                              TEMP_PART_NAME, TRUE);
+        create_partition_name(normal_path, path,
+                              part_elem->partition_name,
+                              NORMAL_PART_NAME, TRUE);
+        table_log_entry.name= normal_path;
+        table_log_entry.from_name= tmp_path;
+        if (part_elem->part_state == PART_IS_CHANGED)
+          table_log_entry->action_type= TLOG_REPLACE_ACTION_CODE;
+        else
+          table_log_entry->action_type= TLOG_RENAME_ACTION_CODE;
+        if (write_table_log_entry(&table_log_entry, &log_entry))
+        {
+          DBUG_RETURN(TRUE);
+        }
+        *next_entry= log_entry->entry_pos;
+        part_elem->table_log_entry= log_entry;
+        insert_part_info_log_entry_list(part_info, log_entry);
+      }
+    }
+  } while (++i < no_elements)
   DBUG_RETURN(FALSE);
 }
 
@@ -5200,7 +5289,7 @@ write_log_dropped_partitions(ALTER_PARTITION_PARAM_TYPE *lpt,
   uint i= 0;
   DBUG_ENTER("write_log_dropped_partitions");
 
-  table_log_entry.action_type= 'd';
+  table_log_entry.action_type= TLOG_DELETE_ACTION_CODE;
   if (temp_list)
     no_elements= no_temp_partitions;
   while (no_elements--)
@@ -5242,6 +5331,8 @@ write_log_dropped_partitions(ALTER_PARTITION_PARAM_TYPE *lpt,
             DBUG_RETURN(TRUE);
           }
           *next_entry= log_entry->entry_pos;
+          if (temp_list)
+            sub_elem->table_log_entry= log_entry;
           insert_part_info_log_entry_list(part_info, log_entry);
         } while (++j < no_subparts);
       }
@@ -5259,6 +5350,8 @@ write_log_dropped_partitions(ALTER_PARTITION_PARAM_TYPE *lpt,
           DBUG_RETURN(TRUE);
         }
         *next_entry= log_entry->entry_pos;
+        if (temp_list)
+          part_elem->table_log_entry= log_entry;
         insert_part_info_log_entry_list(part_info, log_entry);
       }
     }
@@ -5961,10 +6054,8 @@ uint fast_alter_partition_table(THD *thd, TABLE *table,
         ERROR_INJECT_CRASH("crash_change_partition_8") ||
         (close_open_tables_and_downgrade(lpt), FALSE) ||
         ERROR_INJECT_CRASH("crash_change_partition_9") ||
-        mysql_drop_partitions(lpt) ||
-        ERROR_INJECT_CRASH("crash_change_partition_10") ||
         write_log_completed(lpt) ||
-        ERROR_INJECT_CRASH("crash_change_partition_11") ||
+        ERROR_INJECT_CRASH("crash_change_partition_10") ||
         (mysql_wait_completed_table(lpt, table), FALSE))
     {
       abort();

sql/sql_table.cc

@@ -289,28 +289,38 @@ GLOBAL_TABLE_LOG global_table_log;
 
 pthread_mutex_t LOCK_gtl;
 
+#define TLOG_ENTRY_TYPE_POS 0
+#define TLOG_ACTION_TYPE_POS 1
+#define TLOG_PHASE_POS 2
+#define TLOG_NEXT_ENTRY_POS 4
+
+#define TLOG_NO_ENTRY_POS 0
+#define TLOG_NAME_LEN_POS 4
+#define TLOG_HANDLER_TYPE_POS 8
+#define TLOG_IO_SIZE_POS 12
 
 /*
-  Sync table log file
+  Read one entry from table log file
   SYNOPSIS
-    sync_table_log()
+    read_table_log_file_entry()
+    entry_no                     Entry number to read
   RETURN VALUES
-    TRUE                      Error
-    FALSE                     Success
+    TRUE                         Error
+    FALSE                        Success
 */
 
 static
 bool
-sync_table_log()
+read_table_log_file_entry(uint entry_no)
 {
   bool error= FALSE;
-  DBUG_ENTER("sync_table_log");
+  File file_id= global_table_log.file_id;
+  char *file_entry= (char*)global_table_log.file_entry;
+  uint io_size= global_table_log.io_size;
+  DBUG_ENTER("read_table_log_file_entry");
 
-  if (my_sync(global_table_log.file_id, MYF(0)))
-  {
-    /* Write to error log */
+  if (my_pread(file_id, file_entry, io_size, io_size * entry_no, MYF(0)))
     error= TRUE;
-  }
   DBUG_RETURN(error);
 }
 
@@ -358,13 +368,17 @@ write_table_log_header()
   bool error= FALSE;
   DBUG_ENTER("write_table_log_header");
 
-  int4store(&global_table_log.file_entry[0], global_table_log.no_entries);
+  int4store(&global_table_log.file_entry[TLOG_NO_ENTRY_POS],
+            global_table_log.no_entries);
   const_var= FN_LEN;
-  int2store(&global_table_log.file_entry[4], const_var);
-  const_var= 32;
-  int2store(&global_table_log.file_entry[6], const_var);
+  int4store(&global_table_log.file_entry[TLOG_NAME_LEN_POS],
+            const_var);
+  const_var= TLOG_HANDLER_TYPE_LEN;
+  int4store(&global_table_log.file_entry[TLOG_HANDLER_TYPE_POS],
+            const_var);
   const_var= IO_SIZE;
-  int4store(&global_table_log.file_entry[8], const_var);
+  int4store(&global_table_log.file_entry[TLOG_IO_SIZE_POS],
+            const_var);
   if (write_table_log_file_entry(0UL))
     error= TRUE;
   if (!error)
@@ -373,32 +387,6 @@ write_table_log_header()
 }
 
 
-/*
-  Read one entry from table log file
-  SYNOPSIS
-    read_table_log_file_entry()
-    entry_no                     Entry number to read
-  RETURN VALUES
-    TRUE                         Error
-    FALSE                        Success
-*/
-
-static
-bool
-read_table_log_file_entry(uint entry_no)
-{
-  bool error= FALSE;
-  File file_id= global_table_log.file_id;
-  char *file_entry= (char*)global_table_log.file_entry;
-  uint io_size= global_table_log.io_size;
-  DBUG_ENTER("read_table_log_file_entry");
-
-  if (my_pread(file_id, file_entry, io_size, io_size * entry_no, MYF(0)))
-    error= TRUE;
-  DBUG_RETURN(error);
-}
-
-
 /*
   Create table log file name
   SYNOPSIS
@@ -450,11 +438,12 @@ read_table_log_header()
     else
       successful_open= TRUE;
   }
-  entry_no= uint4korr(&file_entry[0]);
-  global_table_log.name_len= uint2korr(&file_entry[4]);
-  global_table_log.handler_type_len= uint2korr(&file_entry[6]);
+  entry_no= uint4korr(&file_entry[TLOG_NO_ENTRY_POS]);
+  global_table_log.name_len= uint4korr(&file_entry[TLOG_NAME_LEN_POS]);
+  global_table_log.handler_type_len=
+        uint4korr(&file_entry[TLOG_HANDLER_TYPE_POS]);
   if (successful_open) 
-    global_table_log.io_size= uint4korr(&file_entry[8]);
+    global_table_log.io_size= uint4korr(&file_entry[TLOG_IO_SIZE_POS]);
   global_table_log.first_free= NULL;
   global_table_log.first_used= NULL;
   global_table_log.no_entries= 0;
@@ -488,11 +477,12 @@ read_table_log_entry(uint read_entry, TABLE_LOG_ENTRY *table_log_entry)
     /* Error handling */
     DBUG_RETURN(TRUE);
   }
-  table_log_entry->entry_type= file_entry[0];
-  table_log_entry->action_type= file_entry[1];
-  table_log_entry->next_entry= uint4korr(&file_entry[2]);
-  table_log_entry->name= &file_entry[6];
-  inx= 6 + global_table_log.name_len;
+  table_log_entry->entry_type= file_entry[TLOG_ENTRY_TYPE_POS];
+  table_log_entry->action_type= file_entry[TLOG_ACTION_TYPE_POS];
+  table_log_entry->phase= file_entry[TLOG_PHASE_POS];
+  table_log_entry->next_entry= uint4korr(&file_entry[TLOG_NEXT_ENTRY_POS]);
+  table_log_entry->name= &file_entry[TLOG_NAME_POS];
+  inx= TLOG_NAME_POS + global_table_log.name_len;
   table_log_entry->from_name= &file_entry[inx];
   inx+= global_table_log.name_len;
   table_log_entry->handler_type= &file_entry[inx];
@@ -637,23 +627,27 @@ write_table_log_entry(TABLE_LOG_ENTRY *table_log_entry,
   bool error, write_header;
   DBUG_ENTER("write_table_log_entry");
 
-  global_table_log.file_entry[0]= 'i';
-  global_table_log.file_entry[1]= table_log_entry->action_type;
-  int4store(&global_table_log.file_entry[2],
+  global_table_log.file_entry[TLOG_ENTRY_TYPE_POS]= TLOG_LOG_ENTRY_CODE;
+  global_table_log.file_entry[TLOG_ACTION_TYPE_POS]=
+                                    table_log_entry->action_type;
+  global_table_log.file_entry[TLOG_PHASE_POS]= 0;
+  int4store(&global_table_log.file_entry[TLOG_NEXT_ENTRY_POS],
             table_log_entry->next_entry);
   DBUG_ASSERT(strlen(table_log_entry->name) < FN_LEN);
-  strncpy(&global_table_log.file_entry[6], table_log_entry->name, FN_LEN);
-  if (table_log_entry->action_type == 'r')
+  strncpy(&global_table_log.file_entry[TLOG_NAME_POS],
+          table_log_entry->name, FN_LEN);
+  if (table_log_entry->action_type == TLOG_RENAME_ACTION_CODE ||
+      table_log_entry->action_type == TLOG_REPLACE_ACTION_CODE)
   {
     DBUG_ASSERT(strlen(table_log_entry->from_name) < FN_LEN);
-    strncpy(&global_table_log.file_entry[6 + FN_LEN],
+    strncpy(&global_table_log.file_entry[TLOG_NAME_POS + FN_LEN],
           table_log_entry->from_name, FN_LEN);
   }
   else
-    global_table_log.file_entry[6 + FN_LEN]= 0;
+    global_table_log.file_entry[TLOG_NAME_POS + FN_LEN]= 0;
   DBUG_ASSERT(strlen(table_log_entry->handler_type) < FN_LEN);
-  strncpy(&global_table_log.file_entry[6 + (2*FN_LEN)],
-         table_log_entry->handler_type, FN_LEN);
+  strncpy(&global_table_log.file_entry[TLOG_NAME_POS + (2*FN_LEN)],
+          table_log_entry->handler_type, FN_LEN);
   if (get_free_table_log_entry(active_entry, &write_header))
   {
     DBUG_RETURN(TRUE);
@@ -705,15 +699,16 @@ write_execute_table_log_entry(uint first_entry,
   if (!complete)
   {
     VOID(sync_table_log());
-    file_entry[0]= 'e';
+    file_entry[TLOG_ENTRY_TYPE_POS]= TLOG_EXECUTE_CODE;
   }
   else
-    file_entry[0]= 'i';
-  file_entry[1]= 0; /* Ignored for execute entries */
-  int4store(&file_entry[2], first_entry);
-  file_entry[6]= 0;
-  file_entry[6 + FN_LEN]= 0;
-  file_entry[6 + 2*FN_LEN]= 0;
+    file_entry[TLOG_ENTRY_TYPE_POS]= TLOG_IGNORE_LOG_ENTRY_CODE;
+  file_entry[TLOG_ACTION_TYPE_POS]= 0; /* Ignored for execute entries */
+  file_entry[TLOG_PHASE_POS]= 0;
+  int4store(&file_entry[TLOG_NEXT_ENTRY_POS], first_entry);
+  file_entry[TLOG_NAME_POS]= 0;
+  file_entry[TLOG_NAME_POS + FN_LEN]= 0;
+  file_entry[TLOG_NAME_POS + 2*FN_LEN]= 0;
   if (!(*active_entry))
   {
     if (get_free_table_log_entry(active_entry, &write_header))
@@ -739,6 +734,88 @@ write_execute_table_log_entry(uint first_entry,
 }
 
 
+/*
+  For complex rename operations we need to inactivate individual entries.
+  SYNOPSIS
+    inactivate_table_log_entry()
+    entry_no                      Entry position of record to change
+  RETURN VALUES
+    TRUE                         Error
+    FALSE                        Success
+  DESCRIPTION
+    During replace operations where we start with an existing table called
+    t1 and a replacement table called t1#temp or something else and where
+    we want to delete t1 and rename t1#temp to t1 this is not possible to
+    do in a safe manner unless the table log is informed of the phases in
+    the change.
+
+    Delete actions are 1-phase actions that can be ignored immediately after
+    being executed.
+    Rename actions from x to y is also a 1-phase action since there is no
+    interaction with any other handlers named x and y.
+    Replace action where drop y and x -> y happens needs to be a two-phase
+    action. Thus the first phase will drop y and the second phase will
+    rename x -> y.
+*/
+
+bool
+inactivate_table_log_entry(uint entry_no)
+{
+  bool error= TRUE;
+  const char *file_entry= (const char*)global_table_log.file_entry
+  DBUG_ENTER("inactivate_table_log_entry");
+
+  if (!read_table_log_file_entry(entry_no))
+  {
+    if (file_entry[TLOG_ENTRY_POS] == TLOG_LOG_ENTRY_CODE)
+    {
+      if (file_entry[TLOG_ACTION_TYPE_POS] == TLOG_DELETE_ACTION_CODE ||
+          file_entry[TLOG_ACTION_TYPE_POS] == TLOG_RENAME_ACTION_CODE ||
+          (file_entry[TLOG_ACTION_TYPE_POS] == TLOG_REPLACE_ACTION_CODE &&
+           file_entry[TLOG_PHASE_POS] == 1))
+        file_entry[TLOG_ENTRY_TYPE_POS]= TLOG_IGNORE_LOG_ENTRY_POS;
+      else if (file_entry[TLOG_ACTION_TYPE_POS] == TLOG_REPLACE_ACTION_CODE)
+      {
+        DBUG_ASSERT(file_entry[TLOG_PHASE_POS] == 0);
+        file_entry[TLOG_PHASE_POS]= 1;
+      }
+      else
+      {
+        DBUG_ASSERT(0);
+      }
+      if (!write_table_log_file_entry(entry_no))
+        error= FALSE;
+    }
+  }
+  DBUG_RETURN(error);
+}
+
+
+/*
+  Sync table log file
+  SYNOPSIS
+    sync_table_log()
+  RETURN VALUES
+    TRUE                      Error
+    FALSE                     Success
+*/
+
+static
+bool
+sync_table_log()
+{
+  bool error= FALSE;
+  DBUG_ENTER("sync_table_log");
+
+  if (my_sync(global_table_log.file_id, MYF(0)))
+  {
+    /* Write to error log */
+    error= TRUE;
+  }
+  DBUG_RETURN(error);
+}
+
+
 /*
   Release a log memory entry
   SYNOPSIS
@@ -795,7 +872,8 @@ execute_table_log_entry(uint first_entry)
       /* Write to error log and continue with next log entry */
       break;
     }
-    DBUG_ASSERT(table_log_entry.entry_type == 'i');
+    DBUG_ASSERT(table_log_entry.entry_type == TLOG_LOG_ENTRY_CODE ||
+                table_log_entry.entry_type == TLOG_IGNORE_LOG_ENTRY_CODE);
     if (execute_table_log_action(&table_log_entry))
     {
       DBUG_ASSERT(0);
@@ -831,7 +909,7 @@ execute_table_log_recovery()
       /* Write to error log */
       break;
     }
-    if (table_log_entry.entry_type == 'e')
+    if (table_log_entry.entry_type == TLOG_EXECUTE_CODE)
     {
       if (execute_table_log_entry(table_log_entry.next_entry))
       {