diff options
Diffstat (limited to 'storage/xtradb/handler/ha_innodb.cc')
| -rw-r--r-- | storage/xtradb/handler/ha_innodb.cc | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/storage/xtradb/handler/ha_innodb.cc b/storage/xtradb/handler/ha_innodb.cc index e90b62aa3db..a50e631de32 100644 --- a/storage/xtradb/handler/ha_innodb.cc +++ b/storage/xtradb/handler/ha_innodb.cc @@ -186,6 +186,8 @@ static my_bool innobase_file_format_check = TRUE; static my_bool innobase_log_archive = FALSE; static char* innobase_log_arch_dir = NULL; #endif /* UNIV_LOG_ARCHIVE */ +static my_bool innobase_use_atomic_writes = FALSE; +static my_bool innobase_use_fallocate = TRUE; static my_bool innobase_use_doublewrite = TRUE; static my_bool innobase_use_checksums = TRUE; static my_bool innobase_fast_checksum = FALSE; @@ -3079,6 +3081,38 @@ innobase_change_buffering_inited_ok: srv_kill_idle_transaction = 0; #endif +#ifdef HAVE_POSIX_FALLOCATE + srv_use_posix_fallocate = (ibool) innobase_use_fallocate; +#endif + srv_use_atomic_writes = (ibool) innobase_use_atomic_writes; + if (innobase_use_atomic_writes) { + fprintf(stderr, "InnoDB: using atomic writes.\n"); + + /* Force doublewrite buffer off, atomic writes replace it. */ + if (srv_use_doublewrite_buf) { + fprintf(stderr, "InnoDB: Switching off doublewrite buffer " + "because of atomic writes.\n"); + innobase_use_doublewrite = srv_use_doublewrite_buf = FALSE; + } + + /* Force O_DIRECT on Unixes (on Windows writes are always unbuffered)*/ +#ifndef _WIN32 + if(!innobase_file_flush_method || + !strstr(innobase_file_flush_method, "O_DIRECT")) { + innobase_file_flush_method = + srv_file_flush_method_str = (char*)"O_DIRECT"; + fprintf(stderr, "InnoDB: using O_DIRECT due to atomic writes.\n"); + } +#endif +#ifdef HAVE_POSIX_FALLOCATE + /* Due to a bug in directFS, using atomics needs + * posix_fallocate to extend the file + * pwrite() past end of the file won't work + */ + srv_use_posix_fallocate = TRUE; +#endif + } + #ifdef HAVE_PSI_INTERFACE /* Register keys with MySQL performance schema */ if (PSI_server) { @@ -12771,6 +12805,20 @@ static MYSQL_SYSVAR_BOOL(doublewrite, innobase_use_doublewrite, "Disable with --skip-innodb-doublewrite.", NULL, NULL, TRUE); +static MYSQL_SYSVAR_BOOL(use_atomic_writes, innobase_use_atomic_writes, + PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY, + "Prevent partial page writes, via atomic writes." + "The option is used to prevent partial writes in case of a crash/poweroff, " + "as faster alternative to doublewrite buffer." + "Currently this option works only " + "on Linux only with FusionIO device, and directFS filesystem.", + NULL, NULL, FALSE); + +static MYSQL_SYSVAR_BOOL(use_fallocate, innobase_use_fallocate, + PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY, + "Preallocate files fast, using operating system functionality. On POSIX systems, posix_fallocate system call is used.", + NULL, NULL, TRUE); + static MYSQL_SYSVAR_ULONG(io_capacity, srv_io_capacity, PLUGIN_VAR_RQCMDARG, "Number of IOPs the server can do. Tunes the background IO rate", @@ -13415,6 +13463,8 @@ static struct st_mysql_sys_var* innobase_system_variables[]= { MYSQL_SYSVAR(doublewrite_file), MYSQL_SYSVAR(data_home_dir), MYSQL_SYSVAR(doublewrite), + MYSQL_SYSVAR(use_atomic_writes), + MYSQL_SYSVAR(use_fallocate), MYSQL_SYSVAR(recovery_stats), MYSQL_SYSVAR(fast_shutdown), MYSQL_SYSVAR(file_io_threads), |