Read slow for large files in S3?

I have two files in a folder, one small 300kb, and one large, 2G. Logstash only reads 300kb one. Is it right? Shall i wait more time?

Is there any indication of network activity, suggesting that it's still working on the 2 GB file? If you bump up logging by starting Logstash with --debug, do the logs indicate that the download is even starting?

Thanks! It keeps saying:
Pushing flush onto pipeline {:level=>:debug, :file=>"logstash/pipeline.rb", :line=>"458", :method=>"flush"}

Does it mean it is downloading the file to my local ram?

S3 files are never downloaded into RAM. But no, that message isn't interesting.

Oh Sorry would you elaborate what does that message mean? what is being flushed into pipeline?