Tomasz Grabiec 8ba6366610 row_cache: Switch to using snapshot_source ...

Currently every time cache needs to create reader for missing data it
obtains a reader which is most up to date. That reader includes writes
from later populate phases, for which update() was not yet
called. This will be problematic once we allow partitions to be
partially populated, because different parts of the partition could be
partially populated using readers using different sets of writes, and break
write atomicity.

The solution will be to always populate given partition using the same
set of writes, using reader created from the current snapshot. The
snapshot changes only on update(), with update() gradually converting
each partition to the new snapshot.

2017-06-24 18:06:11 +02:00

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