[chord] running dhash/chord on very few nodes (<10)

[Alex Tumanov]

Thanks a lot for your reply, Emil. Unfortunately, I couldn't get the framework up as you suggested:

$ cat ./dhash.conf
dhash.efrags 3
dhash.dfrags 1
$ netstat -na |grep 10000
$ ./start-dhash --bindir /home/atumanov/build/chord --root /tmp/atumanov/dht/ --maintmode passingtone -O ./dhash.conf -v 16 -j myhost:10000 -p 10000
RUNNING: /home/atumanov/build/chord/lsd/adbd adbd -d ./db -S ./adbd-sock -q 0
RUNNING: /home/atumanov/build/chord/maint/maintd maintd -d ./maintdata -m passingtone -C ./maint-sock
RUNNING: /home/atumanov/build/chord/lsd/lsd lsd -d ./adbd-sock -S ./dhash-sock -R ./maint-sock -C ./lsd-sock -O ./dhash.conf  -j myhost:10000 -p 10000
REAPED lsd (22212): exited with status 1
REAPED adbd (22198): exited normally
REAPED maintd (22199): exited normally

It immediately exits. I tried with the specification of -v {1,2,3,16} as well. Am I doing something wrong?

Incidentally, is there any way to make this all part of one daemon? Having multiple daemons is a big deterrent for deployment. I did read through the rationale and performance concerns, but still would much prefer having to deal with only one daemon responsible for all aspects of DHT functionality. After all, you could have multiple threads in the same process talking to each other via sockets - that would be pretty close (although, admittedly, not identical) to current multi-daemon behavior.

Thanks again for your time.
Alex.

P.S. same specs as before: 20071115 snapshot, sfslite 0.8.16, glibc: 2.5 & 2.6, kernel : 2.6.18, 2.6.21



----- Original Message ----
From: Emil Sit <sit at MIT.EDU>
To: Alex Tumanov <atumanov at yahoo.com>
Cc: Chord Maillist <chord at amsterdam.lcs.mit.edu>
Sent: Friday, January 25, 2008 5:28:57 PM
Subject: Re: [chord] running dhash/chord on very few nodes (<10)


On 
Thu, 
24 
January 
2008 
at 
00:14 
(-0800), 
Alex 
Tumanov 
wrote:
> 
Is 
it 
possible 
to 
use 
Chord/Dhash 
on 
just 
two 
nodes? 
This 
may 
sound

This 
should 
work, 
though 
it 
may 
not 
with 
the 
default 
shipped
configuration 
at 
the 
moment.  
(Which 
suggests 
perhaps 
that
the 
default 
configuration 
should 
be 
changed...)

If 
you 
create 
a 
file 
(e.g., 
dhash.conf) 
with

    
dhash.efrags 
3
    
dhash.dfrags 
1

and 
run 
start-dhash 
with 
"--maintmode 
passingtone", 
and 
"-O 
dhash.conf",
you 
should 
be 
able 
to 
run 
with 
1 
(or 
2 
or 
3) 
vnodes 
per 
process.

> 
P.S. 
May 
I 
suggest 
a 
minor 
change 
to 
start-dhash 
script? 
Dying 
on
> 
non-existent 
directories 
in 
the 
PATH, 
IMHO, 
is 
unnecessary:

Yes, 
this 
is 
probably 
true, 
thanks.

-- 
Emil 
Sit 
/ 
MIT 
CSAIL 
PDOS 
/ 
http://pdos.csail.mit.edu/chord/  





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