# Logstash Monitor API get 500: Unknown internal error after upgrade to 5.5

**URL:** <https://discuss.elastic.co/t/logstash-monitor-api-get-500-unknown-internal-error-after-upgrade-to-5-5/96897>\
**Category:** Logstash\
**Created:** [August 14, 2017, 3:12am UTC](https://discuss.elastic.co/t/logstash-monitor-api-get-500-unknown-internal-error-after-upgrade-to-5-5/96897 "2017-08-14T03:12:22Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![byakuinss](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/byakuinss/32/23954_2.png) [@byakuinss](https://discuss.elastic.co/u/byakuinss)\
**Post date:** [August 14, 2017, 3:12am UTC](https://discuss.elastic.co/t/logstash-monitor-api-get-500-unknown-internal-error-after-upgrade-to-5-5/96897/1 "2017-08-14T03:12:22Z")

</div>

Hi all,  
I used to run python script to monitor logstash performance through monitor API.  
However, it return 500 status code when query `hot_threads` after I upgraded logstash from 5.4.1 to 5.5.1.  
I checked 5.5 release note and didn't see any changes about monitor API.  
Also, Query `node/stats` is working.  
Any ideas? Thanks in advance.

Error message when query `hot_threads` by curl:

```auto
$ curl -XGET 'localhost:9600/_node/hot_threads?human=true'
{
   "status":500,
   "request_method":"GET",
   "path_info":"/_node/hot_threads",
   "query_string":"human=true",
   "http_version":"HTTP/1.1",
   "http_accept":"*/*",
   "error":"Unexpected Internal Error",
   "class":"Java::JavaLang::IllegalStateException",
   "message":"Duplicate key {cpu.time=845229211935, waited.time=-1, thread.state=runnable, waited.count=193208, thread.name=[main]<redis, blocked.count=3, thread.stacktrace=[sun.nio.ch.EPollArrayWrapper.epollWait(Native Method), sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269), sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)], blocked.time=-1}",
   "backtrace":[
      "java.util.stream.Collectors.lambda$throwingMerger$0(java/util/stream/Collectors.java:133)",
      "java.util.HashMap.merge(java/util/HashMap.java:1253)",
      "java.util.stream.Collectors.lambda$toMap$58(java/util/stream/Collectors.java:1320)",
      "java.util.stream.ReduceOps$3ReducingSink.accept(java/util/stream/ReduceOps.java:169)",
      "java.util.ArrayList$ArrayListSpliterator.forEachRemaining(java/util/ArrayList.java:1374)",
      "java.util.stream.AbstractPipeline.copyInto(java/util/stream/AbstractPipeline.java:481)",
      "java.util.stream.AbstractPipeline.wrapAndCopyInto(java/util/stream/AbstractPipeline.java:471)",
      "java.util.stream.ReduceOps$ReduceOp.evaluateSequential(java/util/stream/ReduceOps.java:708)",
      "java.util.stream.AbstractPipeline.evaluate(java/util/stream/AbstractPipeline.java:234)",
      "java.util.stream.ReferencePipeline.collect(java/util/stream/ReferencePipeline.java:499)",
      "org.logstash.instrument.reports.ThreadsReport.generate(org/logstash/instrument/reports/ThreadsReport.java:29)",
      "java.lang.reflect.Method.invoke(java/lang/reflect/Method.java:498)",
      "RUBY.initialize(/usr/share/logstash/logstash-core/lib/logstash/api/commands/hot_threads_reporter.rb:11)",
      "RUBY.hot_threads(/usr/share/logstash/logstash-core/lib/logstash/api/commands/node.rb:58)",
      "RUBY.HEAD /hot_threads(/usr/share/logstash/logstash-core/lib/logstash/api/modules/node.rb:20)",
      "org.jruby.RubyMethod.call(org/jruby/RubyMethod.java:116)",
      "RUBY.compile!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1611)",
      "org.jruby.RubyProc.call(org/jruby/RubyProc.java:281)",
      "RUBY.route!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:975)",
      "RUBY.route_eval(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:994)",
      "RUBY.route!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:975)",
      "RUBY.process_route(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1015)",
      "org.jruby.RubyKernel.catch(org/jruby/RubyKernel.java:1242)",
      "RUBY.process_route(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1013)",
      "RUBY.route!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:973)",
      "org.jruby.RubyArray.each(org/jruby/RubyArray.java:1613)",
      "RUBY.route!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:972)",
      "RUBY.dispatch!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1085)",
      "RUBY.invoke(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067)",
      "org.jruby.RubyKernel.catch(org/jruby/RubyKernel.java:1242)",
      "RUBY.invoke(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067)",
      "RUBY.dispatch!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1082)",
      "RUBY.call!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:907)",
      "RUBY.invoke(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067)",
      "org.jruby.RubyKernel.catch(org/jruby/RubyKernel.java:1242)",
      "RUBY.invoke(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:1067)",
      "RUBY.call!(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:907)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:895)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb:18)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb:16)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb:18)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-1.6.6/lib/rack/nulllogger.rb:9)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-1.6.6/lib/rack/head.rb:13)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:182)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/sinatra-1.4.8/lib/sinatra/base.rb:2013)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-1.6.6/lib/rack/urlmap.rb:66)",
      "org.jruby.RubyArray.each(org/jruby/RubyArray.java:1613)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-1.6.6/lib/rack/urlmap.rb:50)",
      "RUBY.call(/usr/share/logstash/logstash-core/lib/logstash/api/rack_app.rb:57)",
      "RUBY.call(/usr/share/logstash/logstash-core/lib/logstash/api/rack_app.rb:31)",
      "RUBY.call(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/rack-1.6.6/lib/rack/builder.rb:153)",
      "RUBY.handle_request(/usr/share/logstash/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/server.rb:557)",
      ......
   ]
}

```

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 11, 2017, 3:12am UTC](https://discuss.elastic.co/t/logstash-monitor-api-get-500-unknown-internal-error-after-upgrade-to-5-5/96897/2 "2017-09-11T03:12:30Z")

</div>

Closed on September 11, 2017, 3:12am UTC

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