John,
There is always a prepare phase during which locks are acquired and commit
phase during which changes are finalized and locks are released. The only
difference is that pessimistic transaction acquires each lock separately
while keys are accessed, but optimistic transaction runs the prepare p
Hi Vladimir,
Your answer is what is depicted in the graphics and makes perfect sense to
me. I guess what I'm confused about is what a "prepare" phase means and
what "*In optimistic transactions, locks are acquired on primary nodes
during the "prepare" phase* " means.
My understanding of a "prepa
Hi John,
1) In PESSIMISTIC mode locks are obtained either on first update
(READ_COMMITTED) or even read (REPEATABLE_READ). I.e. they obtained before
prepare phase and are held for the duration of transaction. In OPTIMISTIC
mode locks are obtained only after you call IgniteTransaction.commit().
2)
Hi,
The design doc below states:
*" In optimistic transactions, locks are acquired on primary nodes during
the "prepare" phase, then promoted to backup nodes and released once the
transaction is committed. Depending on an isolation level, if Ignite
detects that a version of an entry has been chan
