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From Alessandro Benedetti <>
Subject Risk of Over Sharding
Date Wed, 23 Sep 2015 14:08:16 GMT
It's quite common to hear about the benefit of sharding.
Until we reach the I/O bound on our machines, sharding is likely to reduce
the query time.
Furthermore working on smaller indexes will make the single searches faster
on the smaller nodes.
But what about the other way around ?
What if we actually shard much more than needed ?
Are we going to see also an increase in the query time ( due to the
overhead of query distribution and aggregation of results ? )

Example : 100.000.000 docs across 16 shards .
Wouldn't be more effective to have 4 or 8 shards maximum ?
I suspect that prototyping is the right answer, but do we have any general
suggestions strongly motivated  ?
Any resource to study ?



Benedetti Alessandro
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"Tyger, tyger burning bright
In the forests of the night,
What immortal hand or eye
Could frame thy fearful symmetry?"

William Blake - Songs of Experience -1794 England

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