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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 edited comment on SOLR-11487 at 4/11/18 7:43 PM:
---------------------------------------------------------------
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}
was (Author: varunthacker):
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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