RE: [javagroups-users] Problems running JavaGroups on Microsoft WindowsNT4

[Asaf K. <as...@j-...>]

Thanks for the response,

Regarding the problem I have with JavaGroups on WindowsNT4, I do not think
it is a network problem, because:
1. I tried it both from home and at work.
2. The Mcast test is working fine.
3. I tried the Draw demo with the same port and ttl and Mcast - Draw fails.
4. I tried Draw with different ports and ttls - Draw fails.
5. Draw succeeds on the same network on machines other than WinNT4.
6. Draw fails on 2 different NT4 machines (so it is not a single machine
problem).

Here are the last properties that I used:

props="UDP(mcast_addr=228.1.2.3;mcast_port=9000;ip_ttl=31):" +
	    "PING(timeout=3000):" +
	    "FD(timeout=5000):" +
	    "VERIFY_SUSPECT(timeout=1500):" +
	    "pbcast.STABLE(desired_avg_gossip=10000):" +
	    // "DISCARD(down=0.1):" +
	    "pbcast.NAKACK(gc_lag=5;retransmit_timeout=3000;trace=true):" +
	    "UNICAST(timeout=5000;min_wait_time=2000):" +
	    // "FRAG:" +

"pbcast.GMS(initial_mbrs_timeout=4000;join_timeout=5000;join_retry_timeout=2
000;" +
	    "shun=false;print_local_addr=true)";

According to the guide, if Mcast works and JavaGroups is not, it is probably
a problem with the stack. I am not fluent with all the layers (what is shun,
for example?), but I am just trying to run the example from the Demos.

Regarding the Distributed Hashtable, I probably didn't explain myself too
good. Here is the thing: if the table is pretty large (1 GB, for example),
it would take a lot of time for the joining entity to sync with the group
members. The question is: will it block for a long time the member that is
cooperating with the new member (I think it is the coordinator, but I'm not
sure)?

> -----Original Message-----
> From: jav...@li...
> [mailto:jav...@li...]On
> Behalf Of Bela Ban
> Sent: Monday, June 04, 2001 3:48 AM
> Cc: jav...@li...
> Subject: Re: [javagroups-users] Problems running JavaGroups
> on Microsoft WindowsNT4
>
>
> Asaf Kariv wrote:
>
> > Has anyone encountered problems in running JavaGroups on
> WindowsNT 4? Has
> > anyone succeeded?
> > The Mcast test is running OK, but the Draw demo does not -
> members do not
> > find each other, even on the same machine.
>
> Sounds to me like a network configuration problem (?)  Can
> you send me the
> properties used for the Draw program ? Make sure you use the
> same IPMCAST
> address, port and TTL in the properties as for your
> Mcast{Sender|Receiver}Test
> program. Maybe the ip_ttl was 0 and your router dropped
> IPMCAST packets
> between subnets ? Were you running the Draw programs all on
> the same machine ?
> Different machines ? I suggest also using
>
> - tcpdump to observe IPMCAST packets
> - the tracing fcilities in JavaGroups to observe whether
> packets reach the
> members (e.g. set "trace0=UDP DEBUG /tmp/trace.udp") in
> JavaGroups.properties
> and ("trace=true").
>
>
>
> > Oh, and another question: the distributed hashtable demo is
> an example of
> > how you can construct a replicated data structure using
> JavaGroups. The
> > issue is, all the state is replicated in every update.
>
> What do you mean by 'all the state' ? If you refer to the
> entire state of a
> member, it is transferred to a members upon joining the group by the
> coordinator. If you refer to the 'put' and 'remove' methods, only the
> modifications for that specific tuple in the DHT are replicated.
>
>
> --
> Bela Ban, Fujitsu Network Communications
> (408) 895-1732
>
>
>
>
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