dcapwell commented on code in PR #50:
URL: https://github.com/apache/cassandra-accord/pull/50#discussion_r1284888611
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accord-core/src/main/java/accord/local/CommandStores.java:
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@@ -474,40 +474,42 @@ public <O> void mapReduceConsume(PreLoadContext context,
IntStream commandStore
public <O> AsyncChain<O> mapReduce(PreLoadContext context, Routables<?>
keys, long minEpoch, long maxEpoch, MapReduce<? super SafeCommandStore, O>
mapReduce)
{
- AsyncChain<O> chain = null;
BiFunction<O, O, O> reducer = mapReduce::reduce;
Snapshot snapshot = current;
ShardHolder[] shards = snapshot.shards;
+ List<AsyncChain<? extends O>> chains = null;
Review Comment:
> abstract O complete(I[] results);
I thought about that, but went with not doing that as that is reinventing
`map`... so can delete all 3 classes in favor of reusing the existing `.map`
logic (and centralize the exception handling).
> This also maintains the benefit of not encapsulating when there's only one
async operation - which we expect to be the norm.
Yes, in the case where there is a single chain this is slightly more memory
than before. In this case the memory is short lived and stack local (so should
be relatively cheap).
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