# {:error=\>#\<NoMethodError: undefined method \`truncate' for #\<IOWriter:0x3e9b038 @io=#\<Zlib::GzipWriter:0x164b00d\>\>

**URL:** <https://discuss.elastic.co/t/error-nomethoderror-undefined-method-truncate-for-iowriter-0x3e9b038-io-zlib-gzipwriter-0x164b00d/132392>\
**Category:** Logstash\
**Created:** [May 17, 2018, 8:02pm UTC](https://discuss.elastic.co/t/error-nomethoderror-undefined-method-truncate-for-iowriter-0x3e9b038-io-zlib-gzipwriter-0x164b00d/132392 "2018-05-17T20:02:41Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![alexus](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alexus/32/12696_2.png) [@alexus](https://discuss.elastic.co/u/alexus)\
**Post date:** [May 17, 2018, 8:02pm UTC](https://discuss.elastic.co/t/error-nomethoderror-undefined-method-truncate-for-iowriter-0x3e9b038-io-zlib-gzipwriter-0x164b00d/132392/1 "2018-05-17T20:02:41Z")

</div>

I'm using `docker.elastic.co/logstash/logstash:6.2.4` and while running bellow pipeline configuration, I get the following:

```
output {
	file {
		path => "/tmp/data.json.gz"
		write_behavior => overwrite
		gzip => true
	}
}

```

following is last message that `logstash` produced:

> [2018-05-17T20:00:03,025][INFO][logstash.outputs.file] Opening file {:path=\>"/tmp/data.json.gz"}

pipeline never terminates and even though `./tmp/data.json.gz` is not zero bytes (file has some data in it), output file comes out corrupted:

```
# gzip --test data.json.gz 

gzip: data.json.gz: unexpected end of file
# 

```

Please advise.

---

<div class="post-metadata">

**Author:** ![alexus](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alexus/32/12696_2.png) [@alexus](https://discuss.elastic.co/u/alexus)\
**Post date:** [May 18, 2018, 4:18am UTC](https://discuss.elastic.co/t/error-nomethoderror-undefined-method-truncate-for-iowriter-0x3e9b038-io-zlib-gzipwriter-0x164b00d/132392/2 "2018-05-18T04:18:44Z")

</div>

`LOG_LEVEL=debug`:

> [2018-05-17T18:00:03,045][FATAL][logstash.runner] An unexpected error occurred! {:error=\>#\<NoMethodError: undefined method `truncate' for #\<IOWriter:0x3e9b038 @io=#Zlib::GzipWriter:0x164b00d\>

logstash:

`Did you mean? trust>, :backtrace=>["org/jruby/RubyBasicObject.java:1657:in `method\_missing'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-file-4.2.3/lib/logstash/outputs/file.rb:320:in `method_missing'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-file-4.2.3/lib/logstash/outputs/file.rb:137:in `block in multi\_receive\_encoded'", "org/jruby/RubyHash.java:1343:in `each'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-file-4.2.3/lib/logstash/outputs/file.rb:134:in `block in multi\_receive\_encoded'", "org/jruby/ext/thread/Mutex.java:148:in `synchronize'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-file-4.2.3/lib/logstash/outputs/file.rb:133:in `multi\_receive\_encoded'", "/usr/share/logstash/logstash-core/lib/logstash/outputs/base.rb:90:in `multi_receive'", "/usr/share/logstash/logstash-core/lib/logstash/output_delegator_strategies/shared.rb:13:in `multi\_receive'", "/usr/share/logstash/logstash-core/lib/logstash/output\_delegator.rb:49:in `multi_receive'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:477:in `block in output\_batch'", "org/jruby/RubyHash.java:1343:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:476:in `output\_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:428:in `worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:386:in `block in start\_workers'"]}`

&

`[2018-05-18T04:15:31,354][ERROR][org.logstash.Logstash] java.lang.IllegalStateException: org.jruby.exceptions.RaiseException: (SystemExit) exit`

---

<div class="post-metadata">

**Author:** ![alexus](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alexus/32/12696_2.png) [@alexus](https://discuss.elastic.co/u/alexus)\
**Post date:** [May 22, 2018, 6:36pm UTC](https://discuss.elastic.co/t/error-nomethoderror-undefined-method-truncate-for-iowriter-0x3e9b038-io-zlib-gzipwriter-0x164b00d/132392/3 "2018-05-22T18:36:23Z")

</div>

this behavior can be reproduced by changing [write\_behavior](https://www.elastic.co/guide/en/logstash/current/plugins-outputs-file.html#plugins-outputs-file-write_behavior) from default `append` to `overwrite`.

Please advise.

---

<div class="post-metadata">

**Author:** ![shaunak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shaunak/32/6643_2.png) [@shaunak](https://discuss.elastic.co/u/shaunak)\
**Post date:** [May 24, 2018, 4:51pm UTC](https://discuss.elastic.co/t/error-nomethoderror-undefined-method-truncate-for-iowriter-0x3e9b038-io-zlib-gzipwriter-0x164b00d/132392/4 "2018-05-24T16:51:11Z")

</div>

Hi @alexus, thanks for this post and the ping on IRC. Generally we report bugs in the corresponding GitHub repositories. So if you have a GitHub account, please do that going forward.

For this one, I've created a bug in the right repository for you: [https://github.com/logstash-plugins/logstash-output-file/issues/66](https://github.com/logstash-plugins/logstash-output-file/issues/66)

---

<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:** [June 21, 2018, 4:51pm UTC](https://discuss.elastic.co/t/error-nomethoderror-undefined-method-truncate-for-iowriter-0x3e9b038-io-zlib-gzipwriter-0x164b00d/132392/5 "2018-06-21T16:51:11Z")

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