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From James Stewart <James.Stew...@Optiver.com.au>
Subject RE: Constant Traffic on port 35872
Date Thu, 17 Jan 2013 04:02:37 GMT
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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