[erlang-questions] Erlang message passing delay after abnormal network disconnection

[Ulf Wiger (TN/EAB)]

It sounds as if the sending node is blocked in auto-connect.

Try the kernel environment variable {dist_auto_connect, once}.
It will ensure that any attempt to send to a disconnected node
immediately fails. If one of the nodes restarts, they will
automatically reconnect, as usual. You can explicitly connect
the two nodes by calling net_kernel:connect(Node).

BR,
Ulf W

Eranga Udesh skrev:
> The problem occurs when the network connectivity is broken (abnormally). 
> The receiving node is not receiving messages. The sending  processes are 
> blocked, since those message delivery calls (gen_event:notify/s, etc) 
> are waiting for about 10 secs to return. We checked the implementation 
> of such calls and notice, the functions are waiting until the messages 
> are delivered to the receiving node. Is there's a way (a system flag may 
> be) to avoid such blocking and to return immediately?
> 
> BRgds,
> - Eranga
> 
> 
> 
> On Mon, Mar 3, 2008 at 6:51 PM, Chandru 
> <chandrashekhar.mullaparthi@REDACTED 
> <mailto:chandrashekhar.mullaparthi@REDACTED>> wrote:
> 
>     On 03/03/2008, Eranga Udesh <eranga.erl@REDACTED
>     <mailto:eranga.erl@REDACTED>> wrote:
>      > Hi,
>      >
>      > I am experiencing a high message passing delay between 2 Erlang
>     nodes, after
>      > an abnormal network disconnection. Those 2 nodes are in a WAN and
>     there are
>      > multiple Hubs, Switches, Routes, etc., in between them. If the
>     message
>      > receiving Erlang node stopped gracefully, the delay doesn't
>     arise. Doing
>      > net_adm:ping/1 to that node results no delay "pang". However
>      > gen_event:notify/2, gen_server:cast/2, etc. are waiting for about
>     10 seconds
>      > to return.
>      >
>      > What's the issue and how this can be avoided?
> 
>     Have you tried putting a snoop to see whether the delay is on the
>     sending/receiving side?
> 
>     This might be useful: http://www.erlang.org/contrib/erlsnoop-1.0.tgz
> 
>     cheers
>     Chandru
> 
> 
> 
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