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https://issues.apache.org/jira/browse/SOLR-2623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063830#comment-13063830
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Mark Miller commented on SOLR-2623:
-----------------------------------
bq. Is this intentional?
Its how noble and I first set things up if I remember right - I've wanted to
address it since as it has a few not nice side affects - have never gotten
around to it though.
> Solr JMX MBeans do not survive core reloads
> -------------------------------------------
>
> Key: SOLR-2623
> URL: https://issues.apache.org/jira/browse/SOLR-2623
> Project: Solr
> Issue Type: Bug
> Components: multicore
> Affects Versions: 1.4, 1.4.1, 3.1, 3.2
> Reporter: Alexey Serba
> Assignee: Shalin Shekhar Mangar
> Priority: Minor
> Fix For: 3.4, 4.0
>
> Attachments: SOLR-2623-branch3x.patch, SOLR-2623.patch,
> SOLR-2623.patch, SOLR-2623.patch, SOLR-2623.patch, SOLR-2623.patch
>
>
> Solr JMX MBeans do not survive core reloads
> {noformat:title="Steps to reproduce"}
> sh> cd example
> sh> vi multicore/core0/conf/solrconfig.xml # enable jmx
> sh> java -Dcom.sun.management.jmxremote -Dsolr.solr.home=multicore -jar
> start.jar
> sh> echo 'open 8842 # 8842 is java pid
> > domain solr/core0
> > beans
> > ' | java -jar jmxterm-1.0-alpha-4-uber.jar
> ....
> solr/core0:id=core0,type=core
> solr/core0:id=org.apache.solr.handler.StandardRequestHandler,type=org.apache.solr.handler.StandardRequestHandler
> solr/core0:id=org.apache.solr.handler.StandardRequestHandler,type=standard
> solr/core0:id=org.apache.solr.handler.XmlUpdateRequestHandler,type=/update
> solr/core0:id=org.apache.solr.handler.XmlUpdateRequestHandler,type=org.apache.solr.handler.XmlUpdateRequestHandler
> ...
> solr/core0:id=org.apache.solr.search.SolrIndexSearcher,type=searcher
> solr/core0:id=org.apache.solr.update.DirectUpdateHandler2,type=updateHandler
> sh> curl 'http://localhost:8983/solr/admin/cores?action=RELOAD&core=core0'
> sh> echo 'open 8842 # 8842 is java pid
> > domain solr/core0
> > beans
> > ' | java -jar jmxterm-1.0-alpha-4-uber.jar
> # there's only one bean left after Solr core reload
> solr/core0:id=org.apache.solr.search.SolrIndexSearcher,type=Searcher@2e831a91
> main
> {noformat}
> The root cause of this is Solr core reload behavior:
> # create new core (which overwrites existing registered MBeans)
> # register new core and close old one (we remove/un-register MBeans on
> oldCore.close)
> The correct sequence is:
> # unregister MBeans from old core
> # create and register new core
> # close old core without touching MBeans
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