dlmarion opened a new issue, #3209:
URL: https://github.com/apache/accumulo/issues/3209
Accumulo will start to heavily use conditional mutations for metadata
updates in one proposed design for achieving elasticity. To support this use
Ample should be updated to support at least the following things.
* Easily writing conditions in java code.
* Submitting batches of updates for efficiency. It can be better to submit
many conditional mutations rather one at time. This could be achieved in impl
with a shared conditional writer that can be used in a process via a queue.
* Be able to know if a conditional metadata update was actually made.
This functionality could be implemented at first in Ample w/o actually using
it Accumulo as a draft PR. For an initial pass would be good to support the
following conditions.
* No location (future or current)
* A specific location
* A specified set of files must exists
The above conditions must be able to specified in java code and mixed
together, like only preform a metadata update if the tablet has location X and
has the file in set Y.
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