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https://issues.apache.org/jira/browse/SOLR-3681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451244#comment-13451244
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Hoss Man commented on SOLR-3681:
--------------------------------

I'm not an expert on replication, but i'm pretty sure this is working as 
designed.

As noted in the comment above the lines in question...

{noformat}
// This command does not give the current index version of the master
// It gives the current 'replicateable' index version
{noformat}

I believe it's important this this code return the information that it does, 
based on the specific commitPoint -- i'm pretty sure if it was changed along 
the lines of your patch, it would return the most current commit point on disk, 
even if that was not a commit point intended for replication.

(FWIW: I think we would also lead a Directory with your patch)

What you see in the admin UI on the otherhand is the latest commit - regardless 
of when/why/if it's available for replication.

One other comment...

bq. http://master_host/solr/core_name/replication?command=indexversion ... 
always shows 0 as index version ...

I can't reproduce this.  It's pretty trivial to see command=indexversion return 
a non-0 response in some simple tests, so can you please provide more details 
about your setup?  what exactly does your solrconfig.xml look like, and what 
types of operations are you trying that leave you with an indexversion of 0?
                
> Index Version incompatibility between DirectoryReader and CommitPoint
> ---------------------------------------------------------------------
>
>                 Key: SOLR-3681
>                 URL: https://issues.apache.org/jira/browse/SOLR-3681
>             Project: Solr
>          Issue Type: Bug
>          Components: replication (java)
>    Affects Versions: 4.0-BETA
>         Environment: MAC OSX Darwin
>            Reporter: Phani Vempaty
>            Priority: Critical
>             Fix For: 4.0
>
>         Attachments: replication_handler.patch
>
>
> There is incompatibility between Index version from Admin core & from the 
> response of a particular index url
> For example:,
> http://master_host/solr/core_name/replication?command=indexversion ... always 
> shows 0 as index version whereas the version in admin shows other version.

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