Flume stops processing event after a while

Hi ,

I am new to flume and using Apache Flume 1.5.0. Quick setup explanation
here.

Source:exec , tail –F command for a logfile.

Channel: tried with both Memory & file channel

Sink: HDFS

When flume starts , processing events happens properly and its moved to
hdfs without any issues.

But after sometime flume suddenly stops sending events to HDFS.

I am not seeing any errors in logfile flume.log as well.Please let me know
if I am missing any configuration here.

Below is the channel configuration defined and I left the remaining to be
default values.

a1.channels.c1.type = FILE

a1.channels.c1.transactionCapacity = 100000

a1.channels.c1.capacity = 10000000

Thanks,
Saravana