[jira] [Created] (SOLR-8727) Limit Threadpools by default

["Björn Häuser (JIRA)" <ji...@apache.org>]

Björn Häuser created SOLR-8727:
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             Summary: Limit Threadpools by default
                 Key: SOLR-8727
                 URL: https://issues.apache.org/jira/browse/SOLR-8727
             Project: Solr
          Issue Type: Improvement
          Components: SolrJ
    Affects Versions: 5.2.1
            Reporter: Björn Häuser


Yesterday we had a problem in our prodution cluster, it was running out of native threads:

{code}
null:java.lang.RuntimeException: java.lang.OutOfMemoryError: unable to create new native thread
	at org.apache.solr.servlet.HttpSolrCall.sendError(HttpSolrCall.java:593)
	at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:465)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:196)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
	at org.eclipse.jetty.server.Server.handle(Server.java:497)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.OutOfMemoryError: unable to create new native thread
	at java.lang.Thread.start0(Native Method)
	at java.lang.Thread.start(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.addWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.execute(Unknown Source)
	at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.execute(ExecutorUtil.java:135)
	at java.util.concurrent.ExecutorCompletionService.submit(Unknown Source)
	at org.apache.solr.handler.component.HttpShardHandler.submit(HttpShardHandler.java:250)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:352)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:2064)
	at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:654)
	at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:450)
	... 22 more
{/code}

After digging a little bit through the source code I found several ThreadPools which a default maxCoreSize of Integer.MAX_VALUE. I think we should figure out a better default then this.

Going to create the corresponding pull reuquest on github for this.




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