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MDEV-15529 IMPORT TABLESPACE unnecessarily uses the doublewrite buffer

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fil_space_t::atomic_write_supported: Always set this flag for
TEMPORARY TABLESPACE and during IMPORT TABLESPACE. The page
writes during these operations are by definition not crash-safe
because they are not written to the redo log.

fil_space_t::use_doublewrite(): Determine if doublewrite should
be used.

buf_dblwr_update(): Add assertions, and let the caller check whether
doublewrite buffering is desired.

buf_flush_write_block_low(): Disable the doublewrite buffer for
the temporary tablespace and for IMPORT TABLESPACE.

fil_space_set_imported(), fil_node_open_file(), fil_space_create():
Initialize or revise the space->atomic_write_supported flag.

buf_page_io_complete(), buf_flush_write_complete(): Add the parameter
dblwr, to indicate whether doublewrite was used for writes.

buf_dblwr_sync_datafiles(): Remove an unnecessary flush of
persistent tablespaces when flushing temporary tablespaces.
(Move the call to buf_dblwr_flush_buffered_writes().)
This commit is contained in:
Marko Mäkelä
2018-03-09 21:25:20 +02:00
parent 54765aaa4d
commit 112df06996
9 changed files with 75 additions and 59 deletions
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2
mysql-test/suite/encryption/r/innodb-discard-import.result
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@ -129,6 +129,6 @@ NOT FOUND /barfoo/ in t2.ibd
# t3 yes on expecting NOT FOUND
NOT FOUND /tmpres/ in t3.ibd
# t4 yes on expecting NOT FOUND
NOT FOUND /mysql/ in t4.ibd
# MDEV-15527 FIXME: Enable this test!
DROP PROCEDURE innodb_insert_proc;
DROP TABLE t1,t2,t3,t4;