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https://issues.apache.org/jira/browse/SOLR-5277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13782464#comment-13782464
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Shawn Heisey commented on SOLR-5277:
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I'm pretty much a beginner at this.  I had a few programming classes a long 
time ago, and started teaching myself java about two years ago. :)  This is the 
only idea I have right now about how to do it.

Better thread names sounds pretty good to me!  I'm willing to give it a try if 
you can point me in the right direction.

It looks like the thread name is included in the example log4j.properties, but 
I don't think I included it in mine that I built myself.  If that's how we want 
to tackle this, the logging docs should probably mention that a lot of useful 
information can only be obtained from the thread names.


> Stamp core names on log entries for certain classes
> ---------------------------------------------------
>
>                 Key: SOLR-5277
>                 URL: https://issues.apache.org/jira/browse/SOLR-5277
>             Project: Solr
>          Issue Type: Bug
>          Components: search, update
>    Affects Versions: 4.3.1, 4.4, 4.5
>            Reporter: Dmitry Kan
>         Attachments: SOLR-5277.patch
>
>
> It is handy that certain Java classes stamp a [coreName] on a log entry. It 
> would be useful for multicore setup if more classes would stamp this 
> information.
> In particular we came accross a situaion with commits coming in a quick 
> succession to the same multicore shard and found it to be hard time figuring 
> out was it the same core or different cores.
> The classes in question with log sample output:
> o.a.s.c.SolrCore
> 06:57:53.577 [qtp1640764503-13617] INFO  org.apache.solr.core.SolrCore - 
> SolrDeletionPolicy.onCommit: commits:num=2
> 11:53:19.056 [coreLoadExecutor-3-thread-1] INFO  
> org.apache.solr.core.SolrCore - Soft AutoCommit: if uncommited for 1000ms;
> o.a.s.u.UpdateHandler
> 14:45:24.447 [commitScheduler-9-thread-1] INFO  
> org.apache.solr.update.UpdateHandler - start 
> commit{,optimize=false,openSearcher=true,waitSearcher=true,expungeDeletes=false,softCommit=true,prepareCommit=false}
> 06:57:53.591 [qtp1640764503-13617] INFO  org.apache.solr.update.UpdateHandler 
> - end_commit_flush
> o.a.s.s.SolrIndexSearcher
> 14:45:24.553 [commitScheduler-7-thread-1] INFO  
> org.apache.solr.search.SolrIndexSearcher - Opening Searcher@1067e5a9 main
> The original question was posted on #solr and on SO:
> http://stackoverflow.com/questions/19026577/how-to-output-solr-core-name-with-log4j



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