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https://issues.apache.org/jira/browse/SOLR-14774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17183441#comment-17183441
]
Tomas Eduardo Fernandez Lobbe commented on SOLR-14774:
------------------------------------------------------
This Jira addresses two bugs:
1) [The
documentation|https://lucene.apache.org/solr/guide/8_6/implicit-requesthandlers.html#admin-handlers]
claims that this can be accessed via {{solr/<core>/admin/health}}, however,
this isn't right. If you look at the code, you'll see that implicit plugins for
the SolrCore are either created with a constructor that receives the SolrCore
or with a parameterless constructor. HealthCheckHandler is supposed to be a top
level handler, so it doesn't have a constructor that receives a SolrCore, so
it'll be created (for the SolrCore) with a parameterless constructor. Now, if
you look at the first line in the {{handleRequestBody}} method, you'll see that
this will never work:
https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/handler/admin/HealthCheckHandler.java#L95.
One alternative is to create a constructor that receives the SolrCore, and
then get the coreContainer from there, but it doesn't make sense, since every
core would be checking the exact same thing. Also, for a in-core healthcheck we
have the "ping" request handler now, which is core-specific and has a different
set of features.
2) This handler was created with the intention of being pluggable. If you see
the
[NodeConfig|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/core/NodeConfig.java#L199],
you'll see that it has a method to get the handler class from {{solr.xml}}.
And if you see
[CoreContainer|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/core/CoreContainer.java#L182],
you'll see that it has a {{healthCheckHandler}} field, that is never
initialized or used. Looks like somewhere in the commits for SOLR-11126 this
was done by mistake.
Let me know if you still have concernes
> 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
> Priority: Major
> Time Spent: 40m
> Remaining Estimate: 0h
>
> 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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