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https://issues.apache.org/jira/browse/SOLR-6673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14190013#comment-14190013
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Erik Hatcher commented on SOLR-6673:
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+11 on MDC!!!

does MDC.clear() need to be called up-front somewhere?   

> 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
>              Labels: logging
>         Attachments: MDC.patch, 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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