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https://issues.apache.org/jira/browse/SOLR-3358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13254390#comment-13254390
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Ryan McKinley commented on SOLR-3358:
-------------------------------------

After thinking a bit more on this, I think we can (optionally) take it another 
step forward.  The log appender/handler could actually send the event to a solr 
index.  Then we could support more complex search/filtering directly with solr.

As a first step, I'll replace my custom format with a SolrDocumentList so that 
anything we do for the in-memory solution could be reused for an index based 
solution.

In a cloud/distributed environment, if all the instances log to the same server 
it would be much easier to spot problems across the whole system.

I'll work up a patch

bq. Right now, i was not able to produce one entry which contains a 
trace-element

try: 
http://localhost:8983/solr/admin/logging?since=0&test=true
this will add a message (and exception) at each level


                
> Show Logging Events in Admin UI
> -------------------------------
>
>                 Key: SOLR-3358
>                 URL: https://issues.apache.org/jira/browse/SOLR-3358
>             Project: Solr
>          Issue Type: Bug
>          Components: web gui
>            Reporter: Ryan McKinley
>            Assignee: Ryan McKinley
>         Attachments: SOLR-3358-logging.patch
>
>
> The UI should be able to show the last few log messages.  To support this, we 
> will need to register an Appender (log4j) or Handler
> (JUL) and keep a buffer of recent log events.

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