[erlang-questions] Non-reproducible bug on a live erlang system

Jayson Vantuyl <>
Thu Jan 14 05:05:39 CET 2010


Selective debugging is one of Erlang's high points.

If the bug often bites the a particular user, seqtoken allows  
debugging to follow a single request. Use that infrastructure to debug  
just that user.

Otherwise, you can also attach a matchspec to debug patterns, so you  
may be able to carefully craft a match to catch the broken behavior at  
some point in the system.

Sent from my iPhone

On Jan 13, 2010, at 7:09 PM, Kaiduan Xie <> wrote:

> Hi, all,
>
> Consider the following case, you have a live/busy Erlang system in
> production which handles thousands of transactions per second and
> millions of users, and customer reported a non-reproducible bug. The
> problem is non-reproducible, or intermittent, or very hard to
> reproduce in live system and in lab.
>
> You can not turn on the debug log that will bring the system down, and
> Erlang trace will not help since the problem is non-reproducible or
> hard to reproduce.
>
> How to resolve this kind problem? Can you shed light on this?
>
> Thanks,
>
> kaiduan
>
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