Details
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Task
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
Description
The function mlog_write_ulint() writes 1, 2, 4, or 8 bytes to an index page and to the redo log buffer of a mini-transaction. The following interface ought to be more suitable for future refactoring:
/** Write request types */ |
enum write_type |
{
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/** the page is guaranteed to always change */ |
NORMAL= 0,
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/** optional: the page contents might not change */ |
OPT,
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/** force a write, even if the page contents is not changing */ |
FORCED
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};
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/** Write 1, 2, 4, or 8 bytes to a file page. |
@param[in] block file page
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@param[in,out] ptr pointer in file page
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@param[in] val value to write
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@tparam l number of bytes to write
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@tparam w write request type
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@tparam V type of val */
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template<unsigned l,write_type w= NORMAL,typename V> |
inline void write(const buf_block_t &block, byte *ptr, V val) |
MY_ATTRIBUTE((nonnull));
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The write_type allows redundant writes to be optimized away. Passing buf_block_t will allow the function mlog_write_initial_log_record_fast() to be replaced with the even faster mlog_write_initial_log_record_low(), and it could also allow the mtr_t::m_memo and mtr_t::m_log to be replaced with a std::map<buf_block_t&,log_t>.
Attachments
Issue Links
- blocks
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- Closed
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MDEV-14462 Confusing error message: ib_logfiles are too small for innodb_thread_concurrency=0
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- Closed
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- causes
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- Closed
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- Closed
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- Closed
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- Closed
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- relates to
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- Closed
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