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https://issues.apache.org/jira/browse/SOLR-12065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390397#comment-16390397
 ] 

Varun Thacker commented on SOLR-12065:
--------------------------------------

I've attached a log file from the local run:

 

What's interesting is that Line 83 says that the collection is restored 
successfully ( while the shard state is in "construction" ) while only in Line 
101 that the shard state becomes active


This looks like a race condition as it should first become active and then 
complete the task. 

[https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/cloud/api/collections/RestoreCmd.java#L280-L292]
 tries to mark it as active , refresh the cluster-state and then proceed which 
seems broken as it's not really refreshed yet and hence is seeing a stale state

> Restore replica always in buffering state
> -----------------------------------------
>
>                 Key: SOLR-12065
>                 URL: https://issues.apache.org/jira/browse/SOLR-12065
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Varun Thacker
>            Assignee: Varun Thacker
>            Priority: Major
>         Attachments: restore_snippet.log
>
>
> Steps to reproduce:
>  
>  - 
> [http://localhost:8983/solr/admin/collections?action=CREATE&name=test_backup&numShards=1&nrtReplicas=1]
>  - curl [http://127.0.0.1:8983/solr/test_backup/update?commit=true] -H 
> 'Content-type:application/json' -d '
>  [ \{"id" : "1"}
> ]' 
>  - 
> [http://localhost:8983/solr/admin/collections?action=BACKUP&name=test_backup&collection=test_backup&location=/Users/varunthacker/backups]
>  - 
> [http://localhost:8983/solr/admin/collections?action=RESTORE&name=test_backup&location=/Users/varunthacker/backups&collection=test_restore]
>  * curl [http://127.0.0.1:8983/solr/test_restore/update?commit=true] -H 
> 'Content-type:application/json' -d '
>  [
> {"id" : "2"}
> ]'
>  * Snippet when you try adding a document
> {code:java}
> INFO - 2018-03-07 22:48:11.555; [c:test_restore s:shard1 r:core_node22 
> x:test_restore_shard1_replica_n21] 
> org.apache.solr.update.processor.DistributedUpdateProcessor; Ignoring commit 
> while not ACTIVE - state: BUFFERING replay: false
> INFO - 2018-03-07 22:48:11.556; [c:test_restore s:shard1 r:core_node22 
> x:test_restore_shard1_replica_n21] 
> org.apache.solr.update.processor.LogUpdateProcessorFactory$LogUpdateProcessor;
>  [test_restore_shard1_replica_n21] webapp=/solr path=/update 
> params={commit=true}{add=[2 (1594320896973078528)],commit=} 0 4{code}
>  * If you see "TLOG.state" from [http://localhost:8983/solr/admin/metrics] 
> it's always 1 (BUFFERING)
>  
>  



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