[Ganglia-developers] 2.6.0 w/multicast

[Matt Massie]

guys

i just uploaded a new snapshot of 2.6.0 to
http://matt-massie.com/ganglia/ganglia-2.6.0.200412121042.tar.gz



the configuration file format for UDP recv channels is

# listen for unicast traffic on port 8649
udp_recv_channel {
  port = 8649
}

# listen for multicast traffic on port 8649 channel 239.2.11.71
udp_recv_channel {
  mcast_join = 239.2.11.71
  port = 8649
}



















hope you guys are having (had) a great weekend.


the duplicate key_metric symbols problem is easy to fix.

-matt

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this snapshot has multicast support (although setting the TTL isn't supported yet although the code is mostly written). all the multicast code is in ./lib/apr_net.[c,h]. there is no limit to the number of unicast and multicast channels you can specify (except for memory and file descriptor limitations). we have about 6 clusters around the department on separate multicast channels. as a test i ran gmond with multiple udp_recv_channels equal to those channels and it heard the traffic from them all. currently, this gmond will send/recv UDP message on any unicast/multicast channel. i just have a few small details to test and cleanup but it's mostly finished (i think i can even track down the windows code to support multicast on windows..we'll see). this 2.6.0 snapshot compile and runs on windows now without multicast. this gmond also has an internal hostname lookup cache to prevent repeating DNS queries (just as the old gmond did).. because some people don't run nscd and having a 1000 nodes hitting a DNS server is just not nice. if you look at the code in ./gmond/gmond.c you'll see that when new hosts are heard from a new host structure is created and added to the host cache. the next step (which i will work on monday) is to save incoming message to the host hash. this will require that i finish tweaking the protocol.x and build some wrapper code around it. once that is finished, i just need to write code to walk the host hash and output xml. lastly, i will need to write a simple cleanup function which enforces the host_dmax attribute. i'm hoping to have a working/testable version of 2.6.0 this week. i will be leaving for christmas break this weekend and returning the first week of january. i probably won't be working too hard on ganglia at that time... but i might have some time. btw, i'm working on setting up an opendarwin box for testing ganglia on darwin. i'm aware there are a few problems compiling it on darwin. i tried to test it on the sourceforge darwin boxes in the compile farm but was painfully slow (i don't know if it would have finished in 24 hours).

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