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From Alexander Alten-Lorenz <wget.n...@gmail.com>
Subject Re: Constant Traffic on port 35872
Date Thu, 17 Jan 2013 07:00:26 GMT
Depends on the architecture, since the nodes are configured per master's webui. The master
calls regularly the in-memory config and spread them around. This is needed for HA, as example.
Flume 1.x up has another architecture.

- Alex

On Jan 17, 2013, at 5:02 AM, James Stewart <James.Stewart@Optiver.com.au> wrote:

> Yeah, I’ve just realised that it’s*exactly* the same data that is returned when you
connect to http://my.flume.node:35862, (for monitoring etc). Even the order in which the metrics
are sent is the same.
> 
> So it seems that the node is generating this configuration data and pumping it back to
the master every 1-2 seconds. This produces ~40-80Kb/sec of largely unnecessary traffic per
node, which soon adds up over a WAN.
> 
> I can understand why this config data would be sent back to the master occasionally but
I don’t understand why it does so every 1-2 seconds, ignoring flume.config.heartbeat.period.
> 
> From: Mike Percy [mailto:mpercy@apache.org]
> Sent: Thursday, 17 January 2013 2:37 PM
> To: user@flume.apache.org
> Subject: Re: Constant Traffic on port 35872
> 
> I doubt it's the Thrift RPC layer. It's most likely the app.
> 
> On Wed, Jan 16, 2013 at 5:53 PM, James Stewart <James.Stewart@optiver.com.au<mailto:James.Stewart@optiver.com.au>>
wrote:
> I thought it was only ‘heartbeats’ that were supposed to go via port 35872, so I
reduced flume.config.heartbeat.period on the nodes to 60 sec. According to the master it’s
only seeing heartbeats every 60 sec now, and yet I still get constantly spammed with data
on port 35872 from every node.
> 
> It does look like metric collection or config reporting of some kind, like it’s reporting
the configuration of the sources/sinks and even data about the JVM:
> 
> ............rt.starttime....Thu Jan 17 11:47:07 EST 2013...     rt.vmname...!Java HotSpot(TM)
64-Bit Server VM....name...(pn-opsynxsr0202.aus.optiver.com.jvm-Info....rt.vmversion....16.3-b01....rt.vmvendor....Sun
Microsystems Inc.
> ..........max.....@......mem.other.used................mem.other.committed.....s......mem.heap.max<mailto:..........max.....@......mem.other.used................mem.other.committed.....s......mem.heap.max>...........
> 
> But it’s just the same data over and over again every second. This traffic is travelling
across a WAN and with a lot of nodes it’s a significant enough amount of data to be a problem.
> 
> I don’t know much about Java, but could this be something to do with Thrift?
> 
> 
> From: Mike Percy [mailto:mpercy@apache.org<mailto:mpercy@apache.org>]
> Sent: Thursday, 17 January 2013 12:19 PM
> To: user@flume.apache.org<mailto:user@flume.apache.org>
> Subject: Re: Constant Traffic on port 35872
> 
> I know next to nothing about Flume OG but if I had to guess I'd say it's either a heartbeat
or metrics collection. Why do you want it to stop?
> 
> On Wed, Jan 16, 2013 at 5:06 PM, James Stewart <James.Stewart@optiver.com.au<mailto:James.Stewart@optiver.com.au>>
wrote:
> Hello all,
> 
> I’m using flume 0.9.4 – before anybody mentions it, we aren’t in a position to
upgrade at the moment due to custom decorators + sinks.
> 
> I’m seeing constant traffic from my various flume nodes back to my master on port 35872.
Even after increasing my timeout period to 60 sec and disabling all custom sources/sinks/decorators,
I am still constantly receiving packets from all of my nodes back to my master. I have included
a dump of the tcp packets below – I receive this same traffic from every node every 1-2
sec.
> 
> Does anybody have any idea what is generating this traffic and how I can stop it?
> 
> Many thanks,
> 
> James
> 
> 
> V..?..-MLogicalNodeManager.my_logical_node_apps.sourceConfig....null...1LogicalNodeManager.my_logical_node_apps.physicalnode....my_physical_node.my_domain.com...:LogicalNodeManager.my_physical_node.my_domain.com.sinkConfig....null...-LogicalNodeManager.my_logical_node_apps.hostname....my_physical_node.my_domain.com....AgentWALAckManager.name....AgentWALAckManager...8LogicalNodeManager.my_physical_node.my_domain.com.nodename....my_physical_node.my_domain.com...<LogicalNodeManager.my_physical_node.my_domain.com.sourceConfig....null....LogicalNodeManager.name....LogicalNodeManager...)LogicalNodeManager.my_logical_node_apps.name....my_logical_node_apps.../LogicalNodeManager.my_logical_node_apps.sinkConfig....null...*LogicalNodeManager.my_logical_node_apps.state....IDLE...8LogicalNodeManager.my_physical_node.my_domain.com.hostname....my_physical_node.my_domain.com...-LogicalNodeManager.my_logical_node_apps.nodename....my_logical_node_apps...9LogicalNodeManager.my_physical_node.my_domain.com.sink.name....NullSink....name....pn-my_physical_node.my_domain.com....LogicalNodeManager.my_logical_node_apps.sink.name....NullSink....LogicalNodeManager.my_logical_node_apps.sink.type....NullSink...7LogicalNodeManager.my_physical_node.my_domain.com.version....Thu
Jan 01 10:00:00 EST 1970...9LogicalNodeManager.my_physical_node.my_domain.com.sink.type....NullSink...5LogicalNodeManager.my_physical_node.my_domain.com.state....IDLE...,LogicalNodeManager.my_logical_node_apps.version....Thu
Jan 17 11:45:44 EST 2013...
> 11:58:22.630881 IP my_physical_node.my_domain.com.53367 > my_master.35872: . 331777:333225(1448)
ack 2613 win 6 <nop,nop,timestamp 1456047935 3787992397>
> E.....@.<<mailto:E.....@.%3c>...
> I..
> B...w. ."..CC1L...........
> ...?..-M4LogicalNodeManager.my_physical_node.my_domain.com.name....my_physical_node.my_domain.com...<LogicalNodeManager.my_physical_node.my_domain.com.physicalnode....my_physical_node.my_domain.com<http://my_physical_node.my_domain.com>
> .......<LogicalNodeManager.my_physical_node.my_domain.com.reconfigures...........1LogicalNodeManager.my_logical_node_apps.reconfigures...........9LogicalNodeManager.my_logical_node_apps.sink.number
of bytes...........:LogicalNodeManager.my_logical_node_apps.sink.n............name...sr0202.aus.optiver.com.my_physical_node.my_domain.com.NullSourceber
of events............
> NullSource....type...
> ...lSource
> ............name....NullSink....type....NullSinksr0202_apps.NullSink
> ............name...sr0202.aus.optiver.com.my_logical_node_apps.NullSource
> NullSource....type...
> ...lSource
> ............name....NullSink....type....NullSinksr0202.aus.optiver.com.NullSink
> ...........(pn-my_logical_node.aus.optiumber of bytes........
> 11:58:22.630891 IP my_physical_node.my_domain.com.53367 > my_master.35872: P 333225:333700(475)
ack 2613 win 6 <nop,nop,timestamp 1456047935 3787992397>
> E.....@.<..c<mailto:E.....@.%3c..c>
> I..
> ..w. .".:CC1L...........
> ............rt.starttime....Thu Jan 17 11:47:07 EST 2013...     rt.vmname...!Java HotSpot(TM)
64-Bit Server VM....name...(pn-my_physical_node.my_domain.com.jvm-Info....rt.vmversion....16.3-b01....rt.vmvendor....Sun
Microsystems Inc.
> ..........max.....@......mem.other.used................mem.other.committed.....s......mem.heap.max<mailto:..........max.....@......mem.other.used................mem.other.committed.....s......mem.heap.max>...........
> 
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--
Alexander Alten-Lorenz
http://mapredit.blogspot.com
German Hadoop LinkedIn Group: http://goo.gl/N8pCF


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