Type:
Priority:
Resolution:
Fixed
Affects Version/s:
10.2(EOL) , 10.3(EOL) , 10.4(EOL) , 10.5 , 10.6 , 10.7(EOL)
The following stack trace could cause reduced performance in cases when the speculative read-ahead is futile, and some useful pages are evicted as a result:
10.5
buf_LRU_get_free_block
buf_page_init_for_read
buf_read_page_low
buf_read_page_background
btr_cur_prefetch_siblings
It could be more useful to only attempt read-ahead if a free block is available in the buffer pool without evicting any page that:
is not marked as freed, or
is not marked as dirty
Furthermore, we should probably avoid read-ahead altogether for temporary tables.
relates to
MDEV-26782
InnoDB temporary tablespace: reclaiming of free space does not work
Closed
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Bug
Major
