No, Accumulo would not skip this update. This is because you are writing
a new value at a new timestamp which is different than the previous
timestamp+value. If you want to avoid re-writing the same update, you
could maintain a transient cache. As long as the cache only returns
false-positives (tells you to write the value when the value is already
present), it's not a big issue to occasionally re-write the same value.
Conditional mutations are much slower than standard mutations because
they have to obtain an exclusive lock for every row being updated.
Ara Ebrahimi wrote:
Hi,
Will accumulo skip writing a cf+cq if the value passed is equal to the existing
value for that cf+cq?
If not is ConditionalMutation the way to go? What are the performance
implications of using ConditionalMutation?
Ara.
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