# Logstash hanging after a few polls to jmx

**URL:** <https://discuss.elastic.co/t/logstash-hanging-after-a-few-polls-to-jmx/83571>\
**Category:** Logstash\
**Created:** [April 25, 2017, 1:28pm UTC](https://discuss.elastic.co/t/logstash-hanging-after-a-few-polls-to-jmx/83571 "2017-04-25T13:28:10Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![k1ng87](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/k1ng87/32/88865_2.png) [@k1ng87](https://discuss.elastic.co/u/k1ng87)\
**Post date:** [April 25, 2017, 1:28pm UTC](https://discuss.elastic.co/t/logstash-hanging-after-a-few-polls-to-jmx/83571/1 "2017-04-25T13:28:10Z")

</div>

I've tried running both logstash 5.3 and 5.2 and I'm noticing the same behavior. In the log output I see this at the end continuing to repeat over and over...

```auto
[2017-04-25T08:30:00,222][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:01,222][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:02,222][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:02,871][DEBUG][logstash.pipeline] Pushing flush onto pipeline
[2017-04-25T08:30:03,223][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:04,223][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:05,223][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:06,223][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:07,223][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:07,872][DEBUG][logstash.pipeline] Pushing flush onto pipeline
[2017-04-25T08:30:08,224][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:09,224][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:10,224][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:11,224][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:12,224][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:12,871][DEBUG][logstash.pipeline] Pushing flush onto pipeline
[2017-04-25T08:30:13,225][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:14,225][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:15,225][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:16,225][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:17,226][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:17,870][DEBUG][logstash.pipeline] Pushing flush onto pipeline
[2017-04-25T08:30:18,226][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:19,226][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:20,226][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:21,226][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:22,227][DEBUG][logstash.inputs.jmx] There are still 3 messages in the queue conf. Sleep 1s.
[2017-04-25T08:30:22,869][DEBUG][logstash.pipeline] Pushing flush onto pipeline

```

which is preventing new jmx messages from coming in.

my conf file looke like this:

```auto
input { 
        jmx {
          path => "/home/ec2-user/jmx-input"
          polling_frequency => 15
          nb_thread => 4
          add_field => {
                        "cluster" => "cluster1"
                }
        }

}
filter {

                ruby {  
                        code => "event.set('timejmx', event.get('@timestamp').to_f * 1000 )"
                }
}
output {
        kafka { 
                topic_id => "kafka-jmx"
                client_id => "logstash1-jmx-producer"
                bootstrap_servers => "kafka1:9092,kafka2:9092,kafka3:9092"
                acks => "0"
                key_serializer =>"org.apache.kafka.common.serialization.StringSerializer"
                codec => "json_lines"
        }

}

```

Whats weird is that I have this same conf setup across multiple nodes and only one of them is showing this issue. it polls JMX 3 times successfully, but then hangs on the above log output.

I have even tweaked with some logstash settings like this but still the same results:

```auto
pipeline.workers: 6
pipeline.output.workers: 3
pipeline.batch.size: 250
pipeline.unsafe_shutdown: true
queue.max_events: 500

```

I have also stripped out the filter and set the output to stdout and am still seeing the same behavior....

---

<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:** [May 23, 2017, 1:30pm UTC](https://discuss.elastic.co/t/logstash-hanging-after-a-few-polls-to-jmx/83571/2 "2017-05-23T13:30:13Z")

</div>

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