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https://issues.apache.org/jira/browse/SOLR-6673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14380519#comment-14380519
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Mike Drob commented on SOLR-6673:
---------------------------------

I was running tests on trunk after this change and did see a lot of lines like
{noformat}
  2> 1363 T13 [] [] [] []  oasc.CoreContainer.<init> New CoreContainer 493421698
{noformat}
IMO, these make the output much harder to read, and it would be nice to clean 
this up.

> MDC based logging of collection, shard etc.
> -------------------------------------------
>
>                 Key: SOLR-6673
>                 URL: https://issues.apache.org/jira/browse/SOLR-6673
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Ishan Chattopadhyaya
>            Assignee: Noble Paul
>              Labels: logging
>             Fix For: Trunk, 5.1
>
>         Attachments: SOLR-6673.patch, SOLR-6673.patch, SOLR-6673.patch, 
> SOLR-6673.patch, SOLR-6673.patch, SOLR-6673.patch, SOLR-6673.patch, 
> SOLR-6673.patch, log4j.properties, log4j.properties
>
>
> In cloud mode, the many log items don't contain the collection name, shard 
> name, core name etc. Debugging becomes specially difficult when many 
> collections/shards are hosted on the same node.
> The proposed solution adds MDC based stamping of collection, shard, core to 
> the thread. 
> See also: SOLR-5969, SOLR-5277



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