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https://issues.apache.org/jira/browse/SOLR-11487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434467#comment-16434467
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Varun Thacker commented on SOLR-11487:
--------------------------------------

Hi David,

I've added the fix version as 7.2 for this Jira for reference

 

We recently had a user who ran into a race condition when updating aliases on a 
Solr 5.x . Looking at master today it looks like we're dealing with race 
conditions and this comment confirms that we fixed it as part of this Jira 

 
{quote}Decomposing aliases.json has pros/cons, but it won't remove the 
possibility of races between modifying some portion of the aliases state; it 
just makes it more rare. So we still need to deal with races in code.... using 
a zkVersion with a retry and eventual timeout, etc.
{quote}
 

 

 

> 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
>            Assignee: David Smiley
>            Priority: Major
>             Fix For: 7.2
>
>         Attachments: SOLR_11487.patch, SOLR_11487.patch, 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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