Added LOAD DATA CONCURRENT

Docs/manual.texi

@@ -20510,7 +20510,8 @@ like you could do this, but that was a bug that has been corrected.
 @section @code{LOAD DATA INFILE} Syntax
 
 @example
-LOAD DATA [LOW_PRIORITY] [LOCAL] INFILE 'file_name.txt' [REPLACE | IGNORE]
+LOAD DATA [LOW_PRIORITY | CONCURRENT] [LOCAL] INFILE 'file_name.txt'
+    [REPLACE | IGNORE]
     INTO TABLE tbl_name
     [FIELDS
         [TERMINATED BY '\t']
@@ -20538,6 +20539,12 @@ If you specify the keyword @code{LOW_PRIORITY}, execution of the
 @code{LOAD DATA} statement is delayed until no other clients are reading
 from the table.
 
+If you specify the keyword @code{CONCURRENT} with a @code{MyISAM} table,
+then other threads can retrieve data from the table while @code{LOAD
+DATA} is executing. Using this option will of course affect the
+performance of @code{LOAD DATA} a bit even if no other thread is using
+the table at the same time.
+
 Using @code{LOCAL} will be a bit slower than letting the server access the
 files directly, because the contents of the file must travel from the client
 host to the server host.  On the other hand, you do not need the
@@ -36784,6 +36791,17 @@ thread that is waiting on the disk-full condition will allow the other
 threads to continue.
 @end itemize
 
+Exceptions to the above behaveour is when you use @code{REPAIR} or
+@code{OPTIMIZE} or when the indexes are created in a batch after an
+@code{LOAD DATA INFILE} or after an @code{ALTER TABLE} statement.
+
+All of the above commands may use big temporary files that left to
+themself would cause big problems for the rest of the system.  If
+@strong{MySQL} gets disk full while doing any of the above operations,
+it will remove the big temporary files and mark the table as crashed
+(except for @code{ALTER TABLE}, in which the old table will be left
+unchanged).
+
 @node Multiple sql commands, Temporary files, Full disk, Problems
 @section How to Run SQL Commands from a Text File
 
@@ -44096,6 +44114,8 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.38
 @itemize @bullet
 @item
+Added option @code{CONCURRENT} to @code{LOAD DATA}.
+@item
 Fixed bug when too many rows where removed when using
 @code{SELECT DISTINCT ... HAVING}.
 @item

scripts/mysqlhotcopy.sh

@@ -30,7 +30,7 @@ mysqlhotcopy - fast on-line hot-backup utility for local MySQL databases and tab
   mysqlhotcopy --method='scp -Bq -i /usr/home/foo/.ssh/identity' --user=root --password=secretpassword \
          db_1./^nice_table/ user@some.system.dom:~/path/to/new_directory
 
-WARNING: THIS IS VERY MUCH A FIRST-CUT ALPHA. Comments/patches welcome.
+WARNING: THIS PROGRAM IS STILL IN BETA. Comments/patches welcome.
 
 =cut
 

sql/lex.h

@@ -88,6 +88,7 @@ static SYMBOL symbols[] = {
   { "COMMIT",		SYM(COMMIT_SYM),0,0},
   { "COMMITTED",	SYM(COMMITTED_SYM),0,0},
   { "COMPRESSED",	SYM(COMPRESSED_SYM),0,0},
+  { "CONCURRENT",	SYM(CONCURRENT),0,0},
   { "CONSTRAINT",	SYM(CONSTRAINT),0,0},
   { "CREATE",		SYM(CREATE),0,0},
   { "CROSS",		SYM(CROSS),0,0},

sql/sql_yacc.yy

@@ -145,6 +145,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %token	COMMITTED_SYM
 %token	COLUMNS
 %token	COLUMN_SYM
+%token	CONCURRENT
 %token	CONSTRAINT
 %token	DATABASES
 %token	DATA_SYM
@@ -2339,7 +2340,7 @@ use:	USE_SYM ident
 
 /* import, export of files */
 
-load:	LOAD DATA_SYM opt_low_priority opt_local INFILE TEXT_STRING
+load:	LOAD DATA_SYM load_data_lock opt_local INFILE TEXT_STRING
 	{
 	  Lex->sql_command= SQLCOM_LOAD;
 	  Lex->local_file= $4;
@@ -2366,6 +2367,12 @@ opt_local:
 	/* empty */	{ $$=0;}
 	| LOCAL_SYM	{ $$=1;}
 
+load_data_lock:
+	/* empty */	{ Lex->lock_option= current_thd->update_lock_default; }
+	| CONCURRENT	{ Lex->lock_option= TL_WRITE_CONCURRENT_INSERT ; }
+	| LOW_PRIORITY	{ Lex->lock_option= TL_WRITE_LOW_PRIORITY; }
+
+
 opt_duplicate:
 	/* empty */	{ Lex->duplicates=DUP_ERROR; }
 	| REPLACE	{ Lex->duplicates=DUP_REPLACE; }
@@ -2523,6 +2530,7 @@ keyword:
 	| COMMIT_SYM		{}
 	| COMMITTED_SYM		{}
 	| COMPRESSED_SYM	{}
+	| CONCURRENT		{}
 	| DATA_SYM		{}
 	| DATETIME		{}
 	| DATE_SYM		{}