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https://issues.apache.org/jira/browse/SOLR-6673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14380938#comment-14380938
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Shalin Shekhar Mangar commented on SOLR-6673:
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bq. Won't it come up with empty []'s for each property with no value? Might be
a little less weird looking if it was just [%X{a} %X{b}...]? (Ideally
conditionals in the pattern would be great if I am not aware of a way to do
with the standard PatternLayout)
Yeah, it will. I don't know of a way to add conditionals in log4j configuration
either. I'm open to suggestions.
> 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-log-more.patch, 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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