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From "Till Westmann" <>
Subject Re: MultiTransactionJobletEventListenerFactory
Date Thu, 16 Nov 2017 22:57:07 GMT
If there are a number of issue with supporting multiple transaction ids
and no clear benefits/use-cases, I’d vote for simplification :)
Also, code that’s not being used has a tendency to "rot" and so I think
that it’s usefulness might be limited by the time we’d find a use for
this functionality.

My 2c,

On 16 Nov 2017, at 13:57, Xikui Wang wrote:

> I'm separating the connections into different jobs in some of my
> experiments... but that was intended to be used for the experimental
> settings (i.e., not for master now)...
> I think the interesting question here is whether we want to allow one
> Hyracks job to carry multiple transactions. I personally think that should
> be allowed as the transaction and job are two separate concepts, but I
> couldn't find such use cases other than the feeds. Does anyone have a good
> example on this?
> Another question is, if we do allow multiple transactions in a single
> Hyracks job, how do we enable commit runtime to obtain the correct TXN id
> without having that embedded as part of the job specification.
> Best,
> Xikui
> On Thu, Nov 16, 2017 at 1:01 PM, abdullah alamoudi <>
> wrote:
>> I am curious as to how feed will work without this?
>> ~Abdullah.
>>> On Nov 16, 2017, at 12:43 PM, Steven Jacobs <> wrote:
>>> Hi all,
>>> We currently have MultiTransactionJobletEventListenerFactory, which
>> allows
>>> for one Hyracks job to run multiple Asterix transactions together.
>>> This class is only used by feeds, and feeds are in process of changing to
>>> no longer need this feature. As part of the work in pre-deploying job
>>> specifications to be used by multiple hyracks jobs, I've been working on
>>> removing the transaction id from the job specifications, as we use a new
>>> transaction for each invocation of a deployed job.
>>> There is currently no clear way to remove the transaction id from the job
>>> spec and keep the option for MultiTransactionJobletEventListenerFactory.
>>> The question for the group is, do we see a need to maintain this class
>> that
>>> will no longer be used by any current code? Or, an other words, is there
>> a
>>> strong possibility that in the future we will want multiple transactions
>> to
>>> share a single Hyracks job, meaning that it is worth figuring out how to
>>> maintain this class?
>>> Steven

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