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From Brock Noland <br...@cloudera.com>
Subject Re: flume write ahead log is finished
Date Tue, 04 Dec 2012 17:36:37 GMT
Generally you should be fine to bring down the file channel at any
point. That is why we have the WAL.

If you wanted to be sure the channel was empty, we do export the
channel size (depth).

On Tue, Dec 4, 2012 at 11:26 AM, Shengjie Min <kelvin.msj@gmail.com> wrote:
> Hi,
> When it comes to maintenance outage, flume needs to be shutdown and offline
> for a while. We want to make sure flume's WAL is completed before we shut
> down the process. Is there anyway or any metrics exposed can indicate WAL is
> fully processed so that it's safe to bring it down gracefully?
> Of coz, the assumption here is that, the source of flume is not writing any
> new data, flume only has a certain size backlog needs to be cleaned up.
> --
> All the best,
> Shengjie Min

Apache MRUnit - Unit testing MapReduce - http://incubator.apache.org/mrunit/

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