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https://issues.apache.org/jira/browse/SOLR-6472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118824#comment-14118824
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Yonik Seeley commented on SOLR-6472:
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bq. This is really annoying because you can forget to add the '!' character at
the end and you wouldn't even know why the request was routed incorrectly.
A system wouldn't forget to add that "!" though.
But really, this was done on purpose as a feature. Routing currently works
with individual documents... if you leave off the bang, you're saying "target
the shard containing this doc". Of course there have been a number of changes
to the routing code since the first commit, and I haven't verified that it
still works.
> Don't require an '!' character at the end of a _route_ (shard.keys) value
> -------------------------------------------------------------------------
>
> Key: SOLR-6472
> URL: https://issues.apache.org/jira/browse/SOLR-6472
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Priority: Minor
> Labels: SolrCloud, difficulty-easy, impact-low
> Fix For: 4.11
>
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> A routing key can be specified in the "_route_" parameter which is then
> hashed and the shard corresponding to the key is selected for
> querying/indexing. But we require users to specify an exclamation mark at the
> end to get the right routing otherwise it fails silently or gives the wrong
> hash. This also applies to the split.key param used in shard splitting.
> This is really annoying because you can forget to add the '!' character at
> the end and you wouldn't even know why the request was routed incorrectly.
> We should make the '!' character optional and support keys both with and
> without it.
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