Hi Matthew,
On 05.05.14 21:21, Matthew Howard wrote:
Has anyone implemented an akka persistence journal for older versions
of Cassandra? I see the current journal is dependent on C* v2.0.3 or
higher (https://github.com/krasserm/akka-persistence-cassandra) but my
app is currently on 1.1.9 and we are only actively planning to upgrade
to v1.2 (just found this out - I thought we were moving to 2).
I'm guessing there isn't one already out there, but thought I'd ask
before attempting to implement one. Assuming I would need to implement
it (probably a question for Martin directly) any warnings or
recommendations? At first glance I'd obviously need to tweak the
create keyspace/columnfamily commands (and change the driver), but I'm
not seeing anything that appears to be too wildly dependent on C*
v2.0.3 features. The handling of the partition_nr seems to be the
biggest issue - I'm thinking we could just create the rowkey as a
concatenation of the processor_id and partition_nr (e.g.
"myprocessor-0", "myprocessor-1", etc... ). But I think/hope?
otherwise the composite columns should work the same and I'm not going
to get myself into a rabbit hole...
The partition_nr is needed to split rows across nodes, otherwise, all
messages of a single processor are stored on the same node (given your
rowkey design). This shouldn't be a problem with, let's say, < 1 billion
messages per processor. However, if you want your processors to scale
with a larger number of messages, there's no way around row splitting.
Hope that helps.
Cheers,
Martin
Thanks in advance,
Matt Howard
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