[ZODB-Dev] [ZODB3.1] easily reproducible deadlock

[Shane Hathaway]

Dieter Maurer wrote:
> I have an appliciation that (for modularity reasons)
> opens two separate ZODB connections to the same ZEO server and
> the same storage. When both connections are affected by a transaction,
> deadlock occurs when the transaction commits.
> The ZEO server reports in this situation:
> 
>    Transaction blocked waiting for storage. Clients waiting: 1.
> 
>    It never unblocks the transaction.
> 
> 
> I fear I understand why this happens and that it will not be easy to
> fix.

We have avoided opening two connections to the same storage for reasons 
just like this.  It's an artifact of the design.  We'd be pleased to 
hear a solution for your problem that does not break the design. :-)

Shane