[jira] [Created] (SOLR-14774) HealthCheckHandler shouldn't be an implicit SolrCore level handler and should be configurable

["Tomas Eduardo Fernandez Lobbe (Jira)" <ji...@apache.org>]

Tomas Eduardo Fernandez Lobbe created SOLR-14774:
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             Summary: HealthCheckHandler shouldn't be an implicit SolrCore level handler and should be configurable
                 Key: SOLR-14774
                 URL: https://issues.apache.org/jira/browse/SOLR-14774
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Tomas Eduardo Fernandez Lobbe


While trying to use the HealthCheckHandler I noticed that:
* CoreContainer has some logic to read config from {{solr.xml}}, however, this is never used, and the handler is constructed explicitly inside {{InfoHandler}}. This means you can't plugin a different implementation.
 * Also noticed that it was added as an implicit plugin to the {{SolrCore}}. which means one could access the handler like {{/<collection-or-core>/admin/health}}, however, this will never work, since it uses a parameterless constructor, which leaves the handler in an invalid state [1]. I honestly don't know why it's being added to the {{SolrCore}}, this is supposed to be a node level handler, and for SolrCore one could use the {{PingRequestHandler}}

 
[1]
{noformat}
2020-08-21 21:14:06.094 ERROR (qtp599782425-18) [c:test s:shard1 r:core_node4 x:test_shard1_replica_n2] o.a.s.s.HttpSolrCall null:org.apache.solr.common.SolrException: CoreContainer is either not initialized or shutting down
        at org.apache.solr.handler.admin.HealthCheckHandler.handleRequestBody(HealthCheckHandler.java:96)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:214)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:2606)
        at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:812)
        at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:588)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:415)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:345)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1596)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:545)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:590)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:221)
        at org.eclipse.jetty.server.handler.InetAccessHandler.handle(InetAccessHandler.java:177)
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
        at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:322)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
        at org.eclipse.jetty.server.Server.handle(Server.java:500)
        at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
        at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
        at java.base/java.lang.Thread.run(Thread.java:834) {noformat}



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