I'm having a very similar problem to what is in issue 913. https://github.com/logstash/logstash/pull/913. My logstash server.log is showing errors like this.
:exception=>java.lang.IllegalArgumentException: Invalid format: "2014-01-29T18:46:00Z" is malformed at "Z"
It seems to be stemming from the sensu logstash handler which is sending a JSON to logstash with @timestamp in this format.
I've also opened an issue over at the sensu community...
My logstash server config is below....
'data_type' => 'list'
'host' => '127.0.0.1'
'key' => 'logstash'
'message_format' => 'json_event'
'threads' => '8'
'type' => 'redis'
'host' => '10.50.2.21'
What version of logstash are you using?
message_format is now a deprecated setting and does not seems to have any consequences in 1.4.x.
Can you re-try with the appropriate json codec outof json, json_line or oldlogstashjson
I'm not familiar with this use case, so I cannot help you more, but for sure message_format is not doing anythin
A little more aggressive garbage-collect on jira.com, expecting follow-up activities to take place on github issues