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https://issues.apache.org/jira/browse/SOLR-8733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17090328#comment-17090328
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Sachin Divekar commented on SOLR-8733:
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Was it ever tested for sharded collection? The documentation of these flags
does not mention anything about this limitation.
> versions=true on Optimistic Concurrency updates doesn't work with in multi
> shard collections
> --------------------------------------------------------------------------------------------
>
> Key: SOLR-8733
> URL: https://issues.apache.org/jira/browse/SOLR-8733
> Project: Solr
> Issue Type: Bug
> Reporter: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-8733_incomplete_test.patch,
> TestReturnedVersions.java
>
>
> Noticed this while working on SOLR-445...
> the {{versions=true}} param is documented as an option that can be used when
> doing updates if you care about opportunistic concurrency so that you know
> for certain which {{_version_}} was associated with each update you send, w/o
> needing to issue a subsequent {{/get}} request for the updated documents
> (which might return some _newer_ version if another client did an update
> immediately after you...
> https://cwiki.apache.org/confluence/display/solr/Updating+Parts+of+Documents
> Ironically, even though DistributedUpdateProcessor is where all of the
> opportunistic concurrency code lives, and the logic for {{versions=true}} is
> handled, it does nothing to ensure that the results are populated when
> requests are forwarded to other leaders - instead, the code seems to just
> assume all updates have their version assigned locally, so they wind up being
> "0" ...
> Single node example of it working properly...
> {noformat}
> $ bin/solr -e techproducts -noprompt
> ...
> $ curl -H 'Content-Type: application/json'
> 'http://localhost:8983/solr/techproducts/update?versions=true' --data-binary
> '[{"id":"abc!111","foo_s":"one"}, {"id":"XYZ!222","foo_s":"two"}]'
> {"responseHeader":{"status":0,"QTime":10},"adds":["abc!111",1527095970400043008,"XYZ!222",1527095970402140160]}
> {noformat}
> Multinode multi-shard example of current broken behavior...
> {noformat}
> $ bin/solr -e cloud -noprompt
> ...
> $ curl -H 'Content-Type: application/json'
> 'http://localhost:8983/solr/gettingstarted/update?versions=true'
> --data-binary '[{"id":"abc!111","foo_s":"one"},
> {"id":"XYZ!222","foo_s":"two"}]'
> {"responseHeader":{"status":0,"QTime":32},"adds":["abc!111",0,"XYZ!222",0]}
> {noformat}
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