29 October 2015 Releases

Logstash 1.5.5 released

By Suyog Rao

After Wednesday’s release bonanza, we still aren’t done – one more today! We are happy to announce the release of Logstash version 1.5.5 today. This is mainly a bug fix release and the last release planned for the 1.5 series.


Filebeat Support

In case you missed it, we recently released a beta version of Filebeat – the next-generation Logstash Forwarder. Filebeat is an agent to ship file-based logs to Logstash for further processing. Logstash version 1.5.5 works out of the box with Filebeat version 1.0.0-beta4 using the logstash-input-beats plugin.

Performance improvements

  • UserAgent and GeoIP Filter: In both these filters, we’ve optimized lookups by adding a LRU cache. This takes advantage of the fact that IPs and user agents commonly seen in web requests often appear in a clustered sequence. In the case of the user agent filter, we saw a boost of ~3.7x on our sample dataset. For GeoIP, the performance boost compared to old version is 1.69x.

  • JSON processing: We updated to a new version of JrJackson, which is the JSON serialization/deserialization library used in Logstash. In addition to fixes, this provides good performance boosts when dealing with JSON.

Other fixes

  • Improved default security configuration for SSL/TLS. Default is now TLS1.2 (#3955).
  • Update to JRuby 1.7.22 (#3833)
  • HTTP Output: Fixed a memory leak related to asynchronous requests (#24).


Please download Logstash 1.5.5 and let us know what you think on Twitter (@elastic) or on our forum. You can report any problems on the GitHub issues page.