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From Ahmed Vila <av...@devlogic.eu>
Subject Re: Need suggestion on reliable source for log processing
Date Mon, 27 Oct 2014 09:40:37 GMT

It all depends on how log rotation is done and how application producing
the log file handles log rotation.
Most of the applications just reopens the log file when it receives a kill
signal. For example, nginx reopens the log file when it receives USR1
signal, but it doesn't stop the process. Some applications might restart as
a result.

If the application just reopens the log file, then you can change your log
rotation policy to be per minute.
In that case logrotate daemon won't satisfy such case, so you'll have to
make a cron job to do it.
In such case, you would separate finished logs location and live log
location so the spooling directory source doesn't freak out about active
log file being appended.

Anyway, spooling directory source is a way to go, as it will leave log
files in place, just renamed.


On Mon, Oct 27, 2014 at 10:21 AM, SaravanaKumar TR <saran0081986@gmail.com>

> Hi,
> I am using Apache flume 1.5.0.Quick setup explanation here.
> Source:exec , tail –F command for a logfile.
> Channel:  file channel
> Sink: HDFS
> Use case:to move real time data from logfile to HDFS.
> It appears like exec is not a reliable source , as we may data loss if
> channel/source is down.
> So i tried with other option "spooling directory source" which is
> mentioned as reliable source.But here I have a single logfile where data
> gets appended in , so I dont see option of moving the file to spool
> directory.
> Can anyone help me with providing any other reliable source option in case
> where logfile gets appended with data and logfile rotation happens only at
> the end of the day.
> Thanks,
> Saravana

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