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https://issues.apache.org/jira/browse/SOLR-8127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18079150#comment-18079150
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Lucas Kot-Zaniewski commented on SOLR-8127:
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Thanks [~dsmiley]... what particular things were you worried about in terms of
backwards compatibility? This wasn't released in 10.0 so whatever backwards
incompatibilities will already exist across minor versions in 10.X. I remember
discussing this in PR but I guess I don't really have an intuition about what
is "too incompatible" in 9.10 -> 9.11 to warrant a different solution from 10.0
-> 10.1. One small thing that comes to mind is removing the client version
check, i.e. always *try* to narrow numDocs (9.11) vs only narrow if the client
is old (10.1). I suppose in 9 we can just assume clients are old (and I don't
know if your version check metadata was ported to 9.11)?. But this isn't really
making 9.11 any more compatible than 10.1, at least as far as I can see.
> Luke request handler does not know about dynamic fields on other shards fast
> enough
> -----------------------------------------------------------------------------------
>
> Key: SOLR-8127
> URL: https://issues.apache.org/jira/browse/SOLR-8127
> Project: Solr
> Issue Type: Bug
> Components: Schema and Analysis, SolrCloud
> Affects Versions: 4.10.2
> Environment: 3 shards
> Reporter: Alex K
> Assignee: Lucas Kot-Zaniewski
> Priority: Major
> Labels: dynamic, luke, pull-request-available, replication,
> sharding
> Time Spent: 5h
> Remaining Estimate: 0h
>
> Add a document with a new (never seen before) dynamic field. It will not be
> visible through Luke requests on the other shards for quite a while, and
> there is no documentation regarding exactly how long it will take. The result
> is that a query to Luke must be made to every shard in the cluster if all
> dynamic fields are needed.
> All shards should be aware of a new dynamic field within seconds, if not
> milliseconds.
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