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https://issues.apache.org/jira/browse/SOLR-6732?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timothy Potter updated SOLR-6732:
---------------------------------
    Attachment: SOLR-6732.patch

Here's an updated patch that should allow for hot, rolling upgrades - handling 
the String state or JSON map correctly. I've added a unit test that checks for 
back-compat support.

The other concern is a node running old code that expects a String state and 
not the JSON map. I think that will not cause any issues since it will just 
treat the map as a String; a recovering replica will just delete the value once 
it's active. 

However, before I commit this I'll do a rolling upgrade to ensure no issues 
when going from 4.8.x to 4.10.3

> Back-compat break for LIR state in 4.10.2
> -----------------------------------------
>
>                 Key: SOLR-6732
>                 URL: https://issues.apache.org/jira/browse/SOLR-6732
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 4.10.2
>            Reporter: Shalin Shekhar Mangar
>            Assignee: Timothy Potter
>            Priority: Blocker
>             Fix For: 4.10.3
>
>         Attachments: SOLR-6732.patch, SOLR-6732.patch
>
>
> We changed the LIR state to be kept as a map but it is not back-compatible. 
> The problem is that we're checking for map or string after parsing JSON but 
> if the key has "down" as a string then json parsing will fail.
> This was introduced in SOLR-6511. This error will prevent anyone from 
> upgrading to 4.10.2
> http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201411.mbox/%3c54636ed2.8040...@cytainment.de%3E



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