Tomasz Grabiec 477d7b439b row_cache: Fix violation of continuity on concurrent eviction and population ...

ensure_population_lower_bound() returned true if current clustering
range covers all rows, which means that the populator has a right to
set continuity flag to true on the row it inserts. This is correct
only if the current population range actually starts since before all
clustering rows. Otherwise we're populating since _last_row, and
should consult it.

The fix introduces a new flag, set when starting to populte, which
indicates if we're populating from the beginning of the range or
not. We cannot simply check if _last_row is set in
ensure_population_lower_bound() because _last_row can be set and then
become empty again.

Fixes #3608

2018-07-17 16:43:21 +02:00

29 KiB

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