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https://issues.apache.org/jira/browse/SOLR-11487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16252748#comment-16252748
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Gus Heck commented on SOLR-11487:
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* compute if absent: used it in the constructor, elsewhere we don't want to
modify the map we are querying.
* getZNodeVersion (/)
* resolveAliases - That check was previously needed because a conversion to map
of list from map of comma separated string and the method doing the conversion
didn't like nulls. Now that that has gone away this can to. (removed)
* unmodifiable lists: This thought had crossed my mind but I had a vague worry
that making them unmodifiable from the start might cause issues and wanted to
get the patch up so I didn't invesigate, but I've found no support for my
worries. Lists are now unmodifiable from the start. I very much prefer that
they not be modifiable. If we are going to be immutable we should really be
immutable so as not to trick someone later, be they internal or external.
* EMPTY_MAP (/)
* cloneCollectionMetadataMap: (/)
*
> Collection Alias metadata for time partitioned collections
> ----------------------------------------------------------
>
> Key: SOLR-11487
> URL: https://issues.apache.org/jira/browse/SOLR-11487
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: David Smiley
> Attachments: SOLR_11487.patch, SOLR_11487.patch, SOLR_11487.patch,
> SOLR_11487.patch, SOLR_11487.patch, SOLR_11487.patch, SOLR_11487.patch
>
>
> SOLR-11299 outlines an approach to using a collection Alias to refer to a
> series of collections of a time series. We'll need to store some metadata
> about these time series collections, such as which field of the document
> contains the timestamp to route on.
> The current {{/aliases.json}} is a Map with a key {{collection}} which is in
> turn a Map of alias name strings to a comma delimited list of the collections.
> _If we change the comma delimited list to be another Map to hold the existing
> list and more stuff, older CloudSolrClient (configured to talk to ZooKeeper)
> will break_. Although if it's configured with an HTTP Solr URL then it would
> not break. There's also some read/write hassle to worry about -- we may need
> to continue to read an aliases.json in the older format.
> Alternatively, we could add a new map entry to aliases.json, say,
> {{collection_metadata}} keyed by alias name?
> Perhaps another very different approach is to attach metadata to the
> configset in use?
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