# Logstash error stack

**URL:** <https://discuss.elastic.co/t/logstash-error-stack/53561>\
**Category:** Logstash\
**Created:** [June 21, 2016, 7:48pm UTC](https://discuss.elastic.co/t/logstash-error-stack/53561 "2016-06-21T19:48:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sharon.c](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sharon.c/32/16076_2.png) [@sharon.c](https://discuss.elastic.co/u/sharon.c)\
**Post date:** [June 21, 2016, 7:48pm UTC](https://discuss.elastic.co/t/logstash-error-stack/53561/1 "2016-06-21T19:48:22Z")

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I am using logstash 2.2.4, elasticsearch 4.5, filebeat 1.1.1

> 

Beats input: unhandled exception {:exception=\># Zlib::BufError: buffer error \>, :backtrace=\>["org/jruby/ext/zlib/ZStream.java:134:in `finish'", "org/jruby/ext/zlib/JZlibInflate.java:72:in `inflate'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/lumberjack/beats/server.rb:380:in `compressed_payload'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/lumberjack/beats/server.rb:251:in `feed'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/lumberjack/beats/server.rb:462:in `read_socket'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/lumberjack/beats/server.rb:442:in `run'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/logstash/inputs/beats\_support/connection\_handler.rb:33:in `accept'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/logstash/inputs/beats.rb:211:in `handle\_new\_connection'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/logstash/inputs/beats\_support/circuit\_breaker.rb:42:in `execute'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/logstash/inputs/beats.rb:211:in `handle\_new\_connection'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-beats-2.2.7/lib/logstash/inputs/beats.rb:167:in `run'"], :level=\>:error}

Can anybody interpret this error stack for me?

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<div class="post-metadata">

**Author:** ![sharon.c](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sharon.c/32/16076_2.png) [@sharon.c](https://discuss.elastic.co/u/sharon.c)\
**Post date:** [June 21, 2016, 9:46pm UTC](https://discuss.elastic.co/t/logstash-error-stack/53561/2 "2016-06-21T21:46:27Z")

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According to my diagnoses, my logstash nodes needs more cpu power.  
The logstash process delayed when cpu is not enough , buffer filled up and broke the pipeline, that's why the error is showing.  
In newrelic monitor, the moving average cpu consumption was 80% when this error shows, it might reach 100% actually.

.

This is the newrelic histogram showing a node with **not** enough CPU. Network I/O is zigzag, looks like it needs to wait for cpu to finish processing a batch, then flush the output to the network

 ![](https://us1.discourse-cdn.com/elastic/original/2X/3/3a5307de5c0595103bcfefb6d461444562946c17.png)

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This is the newrelic histogram showing a node with enough CPU. The Network I/O is smooth.

 ![](https://us1.discourse-cdn.com/elastic/original/2X/3/39bc88eb9b1fed5ddca2d8c0851a6ff4a35581bc.png)

Is it correct interpretation?

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<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:** [July 6, 2017, 4:51am UTC](https://discuss.elastic.co/t/logstash-error-stack/53561/3 "2017-07-06T04:51:20Z")

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