[Spread-users] Re: Question about unexpected spread behaviour

[Uma Chingunde]

I am sorry about the spam if this email has been seen multiple times.
Resending without the log files.

On 8/22/07, Uma Chingunde <umac at jhu.edu> wrote:
>
> Hi,
>
> I have a Spread configuration between 2 hosts and I am seeing some weird
> behavior between them.
> Since the network does not support broadcast I have configured both hosts
> as separate sites.
>
> My spread.conf looks like this:
> --------
> Spread_Segment  x.x.x.255:4899 {
>
>         uma-vm-1                x.x.x.105
> }
> Spread_Segment  x.x.x.255:4899 {
>
>         uma-vm-2                x.x.x.106
> }
> ---------------------
>
> I have a test application that communicates using spread.
> However at certain intervals the second daemon seems to partition away and
> then re-merge when no network change has occurred.
> I initially thought that the application was sending a wrong message to
> spread that was causing the problem. However it doesn't seem to be the case.
>
>
> The first daemon's log file (spread1.log) shows both daemons as always
> being in the same partition.
> The log files for the partitioned daemon (spread2.log) shows the segments
> occasionally in different partitions.
>
> The relevant snippets are below and the log files are attached.
> Does anyone have an idea about why I am seeing such behavior?
> I can't figure out why one daemon would see a network partition
> differently from the other, if such a partition was occurring which I am
> pretty sure in this case is not.
> Is there a configuration issue that I am missing somewhere?
>
> Any help would be appreciated.
> Thanks,
> Uma
>
> Log file snippet for first daemon
> ------------------------------------------
> Conf_load_conf_file: My name: uma-vm-1, id: x.x.x.105, port: 4899
> Membership id is ( 168918633, 1187811520)
> --------------------
> Configuration at uma-vm-1 is:
> Num Segments 2
>     1    x.x.x.255     4899
>         uma-vm-1                x.x.x.105
>     1    x.x.x.255     4899
>         uma-vm-2                x.x.x.106
> ====================
> Membership id is ( 168918633, 1187811620)
> --------------------
> Configuration at uma-vm-1 is:
> Num Segments 2
>     1    x.x.x.255     4899
>         uma-vm-1                x.x.x.105
>     1    x.x.x.255     4899
>         uma-vm-2                x.x.x.106
> ====================
> Membership id is ( 168918633, 1187811682)
> --------------------
> Configuration at uma-vm-1 is:
> Num Segments 2
>     1    x.x.x.255     4899
>         uma-vm-1                x.x.x.105
>     1    x.x.x.255     4899
>         uma-vm-2                x.x.x.106
> ====================
> Membership id is ( 168918633, 1187811800)
> --------------------
>
> Log file snippet for second daemon
> ---------------------------------------
> Membership id is ( 168918633, 1187811520)
> --------------------
> Configuration at uma-vm-2 is:
> Num Segments 2
>     1    x.x.x.255     4899
>         uma-vm-1                x.x.x.105
>     1    x.x.x.255      4899
>         uma-vm-2                x.x.x.106
> ====================
> Membership id is ( 168918633, 1187811620)
> --------------------
> Configuration at uma-vm-2 is:
> Num Segments 2
>     1    x.x.x.255      4899
>         uma-vm-1                x.x.x.105
>     1    x.x.x.255     4899
>         uma-vm-2                x.x.x.106
> ====================
> Membership id is ( 168918634, 1187811665)
> --------------------
> Configuration at uma-vm-2 is:
> Num Segments 2
>     0    x.x.x.255     4899
>     1    x.x.x.255     4899
>         uma-vm-2                x.x.x.106
> ====================
> Membership id is ( 168918633, 1187811682)
> --------------------
> Configuration at uma-vm-2 is:
> Num Segments 2
>     1    x.x.x.255     4899
>         uma-vm-1                x.x.x.105
>     1    x.x.x.255     4899
>         uma-vm-2                x.x.x.106
> ====================
>
>
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