Multiple line with extreme long log "line"

I am using multiple-line in my logstash. Logstash is receiving log from logstash-forwarder. It works fine. However, when there is extreme long multiple line log (some dump information), logstash stop processing. I can imagine that it should be ok if I can define maximum number of lines. However, there is no such option. Any one meet the same issue and any solution?

Thanks
Loc

Are you using the Codec Multiline or are you using the filter. I use the filter and it tends to get over run. From my understanding the multiline codec for file input is better. I have yet to check it out.

The only solution for this that I can think of is to increase your heap space if the codec does not help