On 9/3/20 2:44 AM, Mark Thomas wrote:
On 31/08/2020 01:05, Phil Steitz wrote:
<snip/>
If others agree it is a good idea for dbcp, I can do it. I can see the
argument that its better to stay with close() even for abandoned and I
have not been able to get the deadlock to happen, so I would like to
wait a bit and allow others to weigh in. Similarly for pool, I would
like to get more community feedback before adding to the interface.
Hmm.
On one hand if the driver deadlocks I don't see how that can be anything
other than a driver bug. If multiple code paths obtain multiple locks
then those code paths must always obtain those locks in the same order.
Anything else is a bug that is likely to result in a deadlock in a
multithreaded environment.
On the other hand, it could be argued that the situation only arises
when an application doesn't correctly return connections to the pool
and/or keeps them for too long and/or doesn't configure the pool
correctly for their usage pattern.
The approach of adding
PooledObjectFactory.destroyObject(PooledObject,CloseMode)
where CloseMode is an Enum with two values looks reasonable to me.
I have started to work on the [pool] changes for this. I want to check
two things before completing the PR:
1. "Close" is a [dbcp] concept which does not make sense for all pool
factories, so I am going to name the enum "DestroyMode" and the two
modes, "Default" and "Abandoned". That leaves room for other modes like
"Evicted" or "Invalid" later.
2. Speaking of later, technically adding modes will not break binary
compatibility. Are we going to be OK adding outside a major release?
If the answer is no, I might argue to include the other natural modes now.
Phil
I do agree that abort() should only be used in the case of abandoned
connections.
Mark
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