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https://issues.apache.org/jira/browse/SOLR-6673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14381812#comment-14381812
 ] 

Joel Bernstein edited comment on SOLR-6673 at 3/26/15 12:48 PM:
----------------------------------------------------------------

I did a fresh 5x checkout this morning and ran the cloud-dev/solrcloud-start.sh 
script and got the error below when I accessed /solr from the servers. Not sure 
if this reflects an error in how solrcloud-start.sh is doing things or a bug in 
Solr.


trace=java.lang.NullPointerException
        at 
org.apache.solr.servlet.SolrDispatchFilter.addMDCValues(SolrDispatchFilter.java:497)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:366)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:220)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
        at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
        at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
        at org.eclipse.jetty.server.Server.handle(Server.java:368)
        at 
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
        at 
org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
        at 
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942)
        at 
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
        at 
org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
        at 
org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
        at java.lang.Thread.run(Thread.java:745)
,code=500



was (Author: joel.bernstein):
I did a fresh 5x checkout this morning and ran the cloud-dev/solrcloud-start.sh 
script and got the error below when I accessed /solr from the servers. Not sure 
if this reflects an error in how solrcloud-start.sh is doing things or a bug in 
Solr.


{trace=java.lang.NullPointerException
        at 
org.apache.solr.servlet.SolrDispatchFilter.addMDCValues(SolrDispatchFilter.java:497)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:366)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:220)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
        at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
        at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
        at org.eclipse.jetty.server.Server.handle(Server.java:368)
        at 
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
        at 
org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
        at 
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942)
        at 
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
        at 
org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
        at 
org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
        at java.lang.Thread.run(Thread.java:745)
,code=500}


> 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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