Unable to use slave ' s temporary directory/tmp-can ' t create/write to file '/tmp/sql_load-' (errcode:17)

This error occurred in MySQL master-slave configuration, and finally found a bug in this MySQL

http://bugs.mysql.com/bug.php?id=62055

The main reason for the bug is: When the open mode is specified in the function of opening the file, if O_creat and O_EXCL are specified at the same time, there will be an error in opening the file when the file exists, but when using MySQL master-slave backup mechanism, When installing multiple mysqld instances on a single server, the code is in the MySQL source/sql/slave.cc file, Mysql5.1.68 is in 2904 rows

/*Check The temporary directory used by commands like LOAD DATA INFILE.*/Static intCheck_temp_dir (Char*tmp_file) {  intFD; My_dir*Dirp; CharTmp_dir[fn_reflen];  size_t Tmp_dir_size; Dbug_enter ("Check_temp_dir"); /*Get the directory from the temporary file. */Dirname_part (Tmp_dir, Tmp_file,&tmp_dir_size); /*Check if the directory exists. */  if(! (dirp=My_dir (TMP_DIR,MYF (MY_WME)))) Dbug_return (1);  My_dirend (DIRP); /*Check permissions to create a file. */ if (fd= my_create (Tmp_file, Create_mode, O_wronly | O_binary | O_excl | O_nofollow, MYF (MY_WME)) < 0 ) Dbug_return (1); /*Clean up . */My_close (FD, MYF (0)); My_delete (Tmp_file, MYF (0)); Dbug_return (0);}

The red is called a function to open the file, my_create, in the function of the third argument passed O_EXCL, but there is no o_creat, continue to see the My_create function, it is defined in the/mysys/my_create.c file

File My_create (Const Char*filename,intCreateFlags,intaccess_flags, Myf myflags) {  intFD, RC; Dbug_enter ("my_create"); Dbug_print ("my",("Name: '%s ' CreateFlags:%d AccessFlags:%d myflags:%d", FileName, CreateFlags, Access_flags, Myflags));#if!defined (no_open_3) fd = OPEN (char *) FileName, Access_flags | O_creat, CreateFlags? Createflags:my_umask); #elif defined (VMS) FD = open ((char *) FileName, Access_flags | O_creat, 0, "ctx=stm", "Ctx=bin"); #elif defined (__win__) fd= my_sopen ((char *) FileName, Access_flags | O_creat | O_binary, Sh_denyno, My_s_iread | my_s_iwrite); #else fd = open (FileName, access_flags); #endif  if((Myflags & My_sync_dir) && (FD >=0) &&my_sync_dir_by_file (FileName, Myflags))    {My_close (fd, myflags); FD= -1; } RC=my_register_filename (FD, filename, file_by_create, ee_cantcreatefile, myflags); /*My_register_filename () may fail on some platforms even if the call to *open () above succeeds. In this case, don ' t leave the stale file because callers assume the file to not exist if My_create () fails, so they don  ' t do any cleanups. */  if(Unlikely (FD >=0&& RC <0))  {    inttmp=My_errno;    My_delete (FileName, myflags); My_errno=tmp; } dbug_return (RC);} /*my_create*/

The red font part of the code is to achieve cross-platform, where the default is the Blue font code, you can see clearly, then add o_creat, at this time caused the o_creat and o_excl at the same time used.

As you can see in the POSIX documentation for the Open function, when O_creat and O_excl are in use, the file will fail if it exists.

Http://linux.die.net/man/3/open

Unable to use slave ' s temporary directory/tmp-can ' t create/write to file '/tmp/sql_load-' (errcode:17)