I have a very old index with more than 12T (re-index data is not an option ...) 
that I want upgrade to 5.3, I’m using lucene-core-4.10.4.jar (I’m in 4.10.4 
right now) to upgrade old segments of data. With solr running I can run the 
command because solr has the lock of the core.





I only want to unload it to perform an index upgrade command to load again 
without stop the node with the core.





The issue here is that the DELETEREPLICA deletes the data … the UNLOAD command 
doesn’t save the original core.properties and creates a new one 
core.properties.unloaded that not store the shard param and creates a new 
random coreNodeName that doesn’t correspond to the name of the clusterstate, 
the result … the core is loaded twice or even worse, in some situation is 
attached to a wrong shard.








—/Yago Riveiro

On Wed, Sep 16, 2015 at 4:38 PM, Erick Erickson <erickerick...@gmail.com>
wrote:

> The not-very-helpful answer is that you're using the core admin API in
> a SolrCloud setup. Please do not do this as (you're well aware of this by 
> now!)
> it's far too easy to get "interesting" results.
> Instead, use the Collections API, specifically the ADDREPLICA and 
> DELETEREPLICA
> commands. Under the covers, they actually create a core via the core admin 
> API,
> but they insure that all the core create parameters are correct. For 
> ADDREPLICA,
> you can also easily insure that a node lands on a particular machine.
> Best,
> Erick
> On Tue, Sep 15, 2015 at 9:46 AM, Yago Riveiro <yago.rive...@gmail.com> wrote:
>> Hi,
>>
>> I’m having some issues with the command CREATE of the CoreAdmin API in solr
>> 4.10.4.
>>
>> When I try to load a previous unloaded core with CREATE command, the result
>> of this operation is 2 replicas in down state. One with the original
>> coreNodeName set in clusterstate.json and other with an new one.
>>
>> I’m with the new solr.xml format and the core.properties of cores looks like
>> (I set this configuration when  upgraded from 4.6.1 in legacy solr.xml to
>> 4.10.4:
>>
>> name=bucket-15_shardX_replicaY
>> shard=shardX
>> collection=bucket-15
>>
>> The API command looks like:
>>
>> solr/admin/cores?action=CREATE&name=bucket-15_shardX_replicaY&collection=bucket-15&shard=shardX&wt=json
>>
>> What I’m doing wrong?
>>
>>
>>
>> -----
>> Best regards
>> --
>> View this message in context: 
>> http://lucene.472066.n3.nabble.com/Problem-with-CoreAdmin-API-CREATE-command-tp4229248.html
>> Sent from the Solr - User mailing list archive at Nabble.com.

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