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https://issues.apache.org/jira/browse/SOLR-5253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13787625#comment-13787625
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Erick Erickson commented on SOLR-5253:
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Reality is that if you try to start without _version_ in your schema Solr
doesn't start. Stack traces all over the place and a non-functioning
installation, can't query, can't get to localhost:8983:/solr, etc. At least
that's what happened when I just tried it on trunk. Top-level error below. Or I
screwed up again when I tested before committing this, that's been known to
happen.
So the current comments _do_ reflect "reality". Whether it should behave this
way is a different question, I was a bit surprised by this behavior as well.
Perhaps another JIRA about making _version_ not required in non-cloud mode is
in order?
As for "id", as far as I know it's not required. Personally I'd like to _make_
it required since, as you say, so much breaks if you don't have it. But that's
another JIRA too.
{msg=SolrCore 'collection1' is not available due to init failure: Unable to use
updateLog: _version_ field must exist in schema, using indexed="true"
stored="true" and multiValued="false" (_version_ does not
exist),trace=org.apache.solr.common.SolrException: SolrCore 'collection1' is
not available due to init failure: Unable to use updateLog: _version_ field
must exist in schema, using indexed="true" stored="true" and
multiValued="false" (_version_ does not exist)
at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:785)
> Move _version_ (and other _*_ fields) to right abpve the id field in the
> example schema.xml
> -------------------------------------------------------------------------------------------
>
> Key: SOLR-5253
> URL: https://issues.apache.org/jira/browse/SOLR-5253
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.5, 5.0
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Priority: Minor
> Attachments: SOLR-5253.patch, SOLR-5253.patch
>
>
> Minor, but it bugs me that it's so easy to try to remove all extraneous
> fields from schema.xml and shoot yourself in the foot. Now and forever more
> we should place all the "special" fields right at the top of the example
> schema. Trivial to do.
> True, we say a nice note "_*_ fields are internal and required", but still.
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