I had this exchange with an IRC user named "kindkid" this morning:
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08:30 < kindkid> I'm using sharding with the implicit router, but I'm seeing
all my documents end up on just one of my 24 shards. What
might be causing this? (4.10.0)
08:35 <@elyograg> kindkid: you used the implicit router. that means that
documents will be indexed on the shard you sent them
to, not
routed elsewhere.
08:37 < kindkid> oh. wow. not sure where I got the idea, but I was under the
impression that implicit router would use a hash of the
uniqueKey modulo number of shards to pick a shard.
08:38 <@elyograg> I think you probably wanted the compositeId router.
08:39 <@elyograg> implicit is not a very good name. It's technically
correct,
but the meaning of the word is not well known.
08:39 <@elyograg> "manual" would be a better name.
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The word "implicit" has a very specific meaning, and I think it's
absolutely correct terminology for what it does, but I don't think that
it's very clear to a typical person. This is not the first time I've
encountered the confusion.
Could we deprecate the implicit name and use something much more
descriptive and easily understood, like "manual" instead? Let's go
ahead and accept implicit in 5.x releases, but issue a warning in the
log. Maybe we can have a startup system property or a config option
that will force the name to be updated in zookeeper and get rid of the
warning. If we do this, my bias is to have an upgrade to 6.x force the
name change in zookeeper.
Thanks,
Shawn
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