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https://issues.apache.org/jira/browse/SOLR-13760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929819#comment-16929819
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Gus Heck commented on SOLR-13760:
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The fix in the pull request parses the date math correctly. The interesting
effect here is that a DRA configured with something like "start":"NOW/DAY"
would never allow old documents for a new category no matter how long it's been
running. I think it's possible to see this as a feature, but also possible to
see it as a bit tricky or surprising. We might want to consider converting the
NOW/DAY to a timestamp and updating the alias after the first document arrives
for a DRA, thus creating a level "first date" across all categories. For a pure
TRA this is not a problem because there is only one time series in play, and
the first TRA collection is created, the start parameter is never used again.
As I type this I think I just realized that the fix in the PR still has a
problem... I suspect that the NOW/DAY config will erroneously reject any
document not in the present day because there's no check to see if a first
collection exists already.... hmm
> Date Math in "start" attribute of routed alias causes exception
> ---------------------------------------------------------------
>
> Key: SOLR-13760
> URL: https://issues.apache.org/jira/browse/SOLR-13760
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 8.3
> Reporter: Gus Heck
> Assignee: Gus Heck
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The start parameter (for Time Routed Aliases and 2-Dimensional Routed Aliases
> using time components) is meant to accept date math as well as a timestamp.
> However it seems that none of the tests actually test this, and my changes
> for DRA forgot to account for it in one place, so an exception is thrown
> adding a document to an alias with such a configuration. Will add a test and
> a fix.
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