Thanks Arvind, So in the load balanced scenario, if sink A goes down, and events go all to sink B, does sink A's status ever get re-checked to be added back to the pool? Or once it's down, it's down?
Chris On Fri, Aug 17, 2012 at 12:01 PM, Arvind Prabhakar <[email protected]>wrote: > Hi, > > FYI - the load balancing sink processor does support simple failover > semantics. The way it works is that if a sink is down, it will proceed to > the next sink in the group until all sinks are exhausted. The failover sink > processor on the other hand does complex failure handling and back-off such > as blacklisting sinks that repeatedly fail etc. The issue [1] tracks > enhancing this processor to support backoff semantics. > > The one issue with your configuration that I could spot by a quick glance > is that you are adding your active sinks to both the sink groups. This does > not really work and the configuration subsystem simply flags the second > inclusion as a problem and ignores it. By design, a sink can either be on > its own or in one explicit sink group. > > [1] https://issues.apache.org/jira/browse/FLUME-1488 > > Regards, > Arvind Prabhakar > > On Fri, Aug 17, 2012 at 8:59 AM, Chris Neal <[email protected]> wrote: > >> Hi all. >> >> The User Guide talks about the various types of Sink Processors, but >> doesn't say whether they can be aggregated together. A Failover Processor >> that moves between 1..n sinks is great, as is a Load Balancer Processor >> that moves between 1..n sinks, but what is the best would be an agent that >> can utilize both a Failover Processor AND a Load Balancer Processor! >> >> I've created a configuration which I believe supports this, and the Agent >> starts up and processes events, but I wanted to ping this group to make >> sure that this configuration is really doing what I think it is doing >> behind the scenes. >> >> Comments? >> >> # Define the sources, sinks, and channels for the agent >> agent.sources = avro-instance_1-source avro-instance_2-source >> agent.channels = memory-agent-channel >> agent.sinks = avro-hdfs_1-sink avro-hdfs_2-sink >> agent.sinkgroups = failover-sink-group lb-sink-group >> >> # Bind sources to channels >> agent.sources.avro-instance_1-source.channels = memory-agent-channel >> agent.sources.avro-instance_2-source.channels = memory-agent-channel >> >> # Define sink group for failover >> agent.sinkgroups.failover-sink-group.sinks = avro-hdfs_1-sink >> avro-hdfs_2-sink >> agent.sinkgroups.failover-sink-group.processor.type = failover >> agent.sinkgroups.failover-sink-group.processor.priority.avro-hdfs_1-sink >> = 5 >> agent.sinkgroups.failover-sink-group.processor.priority.avro-hdfs_2-sink >> = 10 >> agent.sinkgroups.failover-sink-group.processor.maxpenalty = 10000 >> >> # Define sink group for load balancing >> agent.sinkgroups = lb-sink-group >> agent.sinkgroups.group1.sinks = avro-hdfs_1-sink avro-hdfs_2-sink >> agent.sinkgroups.group1.processor.type = load_balance >> agent.sinkgroups.group1.processor.selector = round_robin >> >> # Bind sinks to channels >> agent.sinks.avro-hdfs_1-sink.channel = memory-agent-channel >> agent.sinks.avro-hdfs_2-sink.channel = memory-agent-channel >> >> # avro-instance_1-source properties >> agent.sources.avro-instance_1-source.type = exec >> agent.sources.avro-instance_1-source.command = tail -F /somedir/Trans.log >> agent.sources.avro-instance_1-source.restart = true >> agent.sources.avro-instance_1-source.batchSize = 100 >> >> # avro-instance_2-source properties >> agent.sources.avro-instance_2-source.type = exec >> agent.sources.avro-instance_2-source.command = tail -F >> /somedir/UDXMLTrans.log >> agent.sources.avro-instance_2-source.restart = true >> agent.sources.avro-instance_2-source.batchSize = 100 >> >> # avro-hdfs_1-sink properties >> agent.sinks.avro-hdfs_1-sink.type = avro >> agent.sinks.avro-hdfs_1-sink.hostname = hdfshost1.domin.com >> agent.sinks.avro-hdfs_1-sink.port = 10000 >> >> # avro-hdfs_2-sink properties >> agent.sinks.avro-hdfs_2-sink.type = avro >> agent.sinks.avro-hdfs_2-sink.hostname = hdfshost2.domain.com >> agent.sinks.avro-hdfs_2-sink.port = 10000 >> >> # memory-agent-channel properties >> agent.channels.memory-agent-channel.type = memory >> agent.channels.memory-agent-channel.capacity = 20000 >> agent.channels.memory-agent-channel.transactionCapacity = 100 >> >> Thanks! >> > >
