We implemented memory mapping channel that has memory channel performance and also file channel reliability. We plan to contribute it to open source in near future.
Lining From: Jeff Lord [mailto:jl...@cloudera.com] Sent: Monday, April 07, 2014 8:48 AM To: user@flume.apache.org Subject: Re: Flume Configuration & topology approach No. If you need to guarantee delivery of events please use a file channel. https://blogs.apache.org/flume/entry/apache_flume_filechannel On Mon, Apr 7, 2014 at 8:38 AM, Christopher Shannon <cshannon...@gmail.com<mailto:cshannon...@gmail.com>> wrote: On Apr 7, 2014 9:35 AM, "Jeff Lord" <jl...@cloudera.com<mailto:jl...@cloudera.com>> wrote: > > > > > On Thu, Apr 3, 2014 at 11:27 AM, Mohit Durgapal > <durgapalmo...@gmail.com<mailto:durgapalmo...@gmail.com>> wrote: >> >> Hi Jeff, >> >> Yes, I am using the memory channel, and that's because I want it to be more >> reliable and not miss any events/messages. >> As I've read in flume documentation that the memory channel is fast but >> there could be a chance of missing events if the in-memory buffer fills up. > > > Memory channel is not reliable, meaning if the flume agent goes down or is > restarted while there are events in the channel than this data will be lost. > For reliability please use the file channel. > Jeff, I am using an upstream agent with a spooling directory source and a memory channel, and the downstream agent uses a memory channel and an HDFS sink. If my downstream agent goes down for any reason, are the entries lost in the downstream agent's memory channel still preserved in the memory channel / file directory of the upstream agent? All the best, Chris
