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Make atomic writes general

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- Atomic writes are enabled by default
- Automatically detect if device supports atomic write and use it if
  atomic writes are enabled
- Remove ATOMIC WRITE options from CREATE TABLE
  - Atomic write is a device option, not a table options as the table may
    crash if the media changes
- Add support for SHANNON SSD cards
This commit is contained in:
Sergei Golubchik
2016-12-31 15:11:52 +01:00
committed by Monty
parent ed0bc17bee
commit ed008a74cf
29 changed files with 473 additions and 377 deletions
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6
mysql-test/suite/sys_vars/r/sysvars_innodb.result
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@@ -2584,12 +2584,12 @@ READ_ONLY YES
COMMAND_LINE_ARGUMENT REQUIRED
VARIABLE_NAME INNODB_USE_ATOMIC_WRITES
SESSION_VALUE NULL
GLOBAL_VALUE OFF
GLOBAL_VALUE ON
GLOBAL_VALUE_ORIGIN COMPILE-TIME
DEFAULT_VALUE OFF
DEFAULT_VALUE ON
VARIABLE_SCOPE GLOBAL
VARIABLE_TYPE BOOLEAN
VARIABLE_COMMENT 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.
VARIABLE_COMMENT Enable atomic writes, instead of using the doublewrite buffer, for files on devices that supports atomic writes. To use this option one must use file_per_table=1, flush_method=O_DIRECT and use_fallocate=1. This option only works on Linux with either FusionIO cards using the directFS filesystem or with Shannon cards using any file system.
NUMERIC_MIN_VALUE NULL
NUMERIC_MAX_VALUE NULL
NUMERIC_BLOCK_SIZE NULL