Wow, so comprehensive. Thank you very much. вівторок, 16 травня 2017 р. 18:46:10 UTC+3 користувач Justin du coeur написав: > > On Tue, May 16, 2017 at 11:38 AM, Evgeny Shepelyuk <eshep...@gmail.com > <javascript:>> wrote: > >> My current worrying question is about how to properly build extractShardId >> function. >> According to the docs this function must depend on the number of nodes. >> > > While this is true, you shouldn't over-interpret it. The function isn't > based on the exact number of nodes at a given moment, it's based on the > number of nodes you *expect* is the *likely* maximum size of the cluster. > As you say, you don't want the entity-to-shard mapping to change in > mid-stream (which would lead to chaos), so the number needs to be pretty > static. > > So in practice, you take the expected size of the cluster, multiply that > by around 10, and use that for the number of shards. Exactly where those > shards *live* will rearrange more or less automatically as the cluster > resizes and things rebalance. > > (All of the above is AFAIK; so far, my cluster size is small and > constant. Members of the Akka Team should correct me if I am incorrect.) >
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