Independently on how the schema changes are handled, managing these changes is one of the most complex and error prone drawbacks associated with event sourcing. A strategy should be prepared upfront and considered on the system design.

Also your events will be based on a SomethingCreated or SomethingUpdated which has no business value at all. If the events are being designing like this then it is clear you’re not using DDD at all and you’re better of without event sourcing.

I think you don't hear much about using Kafka for event sourcing primarily because the event sourcing terminology doesn't seem to be very prevalent in the consumer web space where Kafka is most popular.

Another way to get consistency is to assure serialized writes, i.e using the single-writer principle, meaning we make sure all writes concerning a particular entity ID occur on a single thread.

If the business logic fails we return an error to the client but if it succeeds a new event is emitted. In that case we must be able to save the new event to our event store with a guarantee that no other event has been stored for this particular entity ID in the meantime, or we would risk breaking the consistency of our domain objects.

One alternative would be to have one topic per entity

But the Tunguska airburst stands as the most powerful impact event in recorded human history, and it remains enigmatic, as scientists don’t know the origin of the object or whether it was an asteroid or a comet.

Tunguska event

Event time, in contrast, is conceived as "qualitative time-heterogeneous, discontinuous, and unequivalent when different time periods are compared" (Starkey

At a higher level, with their roadmaps and deadlines, projects also hold a temporal dimension.

Event Management Singapore

“Perhaps something occurred in the history of the concept of structure,” so he hypothesized, “that could be called an ‘event,’ if this loaded word did not entail a meaning which it is precisely the function of structural — or structuralist — thought to reduce or to suspect.” Structuralism’s eponymous reliance on structures, on that which by definition is permanent, stable, and universal, made it so that it had no lexicon, no methodology, to deal with “events,” i.e., with that which is singular, wholly other, non-repeatable.

Terrorist use of an actual nuclear bomb is a low-probability event

The combination of the Sun's high circulation and the newsboys meant that everyone throughout the city, spanning all social classes, heard about the lunar discoveries at the same time. They experienced it as a shared social event in a way that was entirely new.

Nov 14 - Nov 18

An international mechanism to address loss and damage is hereby defined under this agreement/protocol and shall be bound by the principles and provisions of the Convention, in particular common but differentiated responsibilities and respective capabilities. The purpose of the mechanism shall be to promote and support the development and implementation of approaches to address loss and damage associated with the adverse effects of climate change, inter alia, extreme events and slow onset events, in developing countries that are particularly vulnerable to the adverse effects of climate change. The international mechanism on loss and damage shall draw upon, further develop and elaborate on the work of the Warsaw International Mechanism on Loss and Damage pursuant to relevant COP decisions, including the development of modalities and procedures for the mechanism’s operation and support. It can involve, as appropriate, existing bodies and expert groups under the Convention, as well as relevant organizations and expert bodies outside the Convention, and be informed by relevant precedents in international law.

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The nationally determined [mitigation] [contribution] [commitment] shall be legally binding on that Party upon entry into force of this Agreement for that Party.]

Progression/ambition Each Party’s successive [NDMC*][INDC] [shall][should][will] represent a progression beyond the Party’s previous efforts and reflect its highest possible ambition [based on common but differentiated responsibilities and respective capabilities [[and] in light of different national circumstances [and best available science]] [based on provision of finance, technology and capacity-building to developing countries].3

equitable distribution of a global carbon budget based on historical responsibilities and [climate] justice]

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[For the purpose of meeting a portion of its mitigation commitment under Article 3, any Party may elect to use certified units (CU) generated under the new market-based mechanism defined under decision 2/CP.17, paragraph 83, subject to the adoption by the CMA of modalities and procedures elaborating each of the elements in decision 1/CP.18 paragraph 51, and the adoption of eligibility rules for participation which promote fair and equitable access for all Parties. These modalities and procedures shall ensure that the design and operation of the mechanism delivers net global emission reductions, through the cancellation of a share of units generated, transferred, used or acquired from offsetting activities.]

The purpose of the REDD-plus mechanism shall be to incentivize the reduction of emissions from deforestation and forest degradation and to promote conservation, sustainable management of forests and enhancement of forest carbon stocks in developing countries, while enhancing the non-carbon benefits derived as a result of the multiple functions of forests, including alleviating poverty and building ecosystem resilience.

Hold the increase in the global average temperature [below 1.5 °C] [or] [well] [below 2 °C] above preindustrial levels by ensuring deep cuts in global greenhouse gas [net] emissions;

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Option 1: [The mobilization of climate finance [shall][should][other] be scaled up [in a predictable and transparent manner] [beyond previous efforts] [from USD 100 billion per year] from 2020[, recognizing the important role of the Green Climate Fund in the scaling up of financial resources for the implementation of this agreement, as well as other multilateral mechanisms and other efforts].] Option 2: [The provision and mobilization of financial resources by developed country Parties and other developed Parties included in Annex II shall represent a progression beyond their previous efforts towards achieving short-term collective quantified goals for the post 2020 period to be periodically established and reviewed. Financial resources shall be scaled up from a floor of US$100 billion per year, including a clear burden-sharing formula [among them], and in line with needs and priorities identified by developing country Parties [including Parties whose special circumstances were recognized by COP decisions] in the context of contributing to the achievement of the [objective][purpose] (Article 2/XX) of this Agreement.

An International Tribunal of Climate Justice is hereby established to address cases of non-compliance with the commitments of developed country Parties on mitigation, adaptation, provision of finance, technology development and transfer, capacity-building, and transparency of action and support, including through the development of an indicative list of consequences, taking into account the cause, type, degree and frequency of non-compliance.

Option 1: communication to 5 year time period Every 5 years, harmonised [NDMC*][INDC] Each Party shall [[communicate its [successive] [new]] [update its] [NDMC][INDC] by [year x] [2020] [2021] and every five years thereafter on a [synchronized][common] basis, [or resubmit an existing [NDMC][INDC]] [for the subsequent five-year time frame], taking into account the outcomes of the global stocktake referred to in Article 10.

In accordance with Article 4, paragraph 2, of the Convention, developed country Parties and other Parties included in Annex I shall undertake quantified economy-wide absolute emission reduction and limitation commitments/targets, which are comparable, measurable, reportable and verifiable, cover all greenhouse gases and are implemented domestically without any conditions. 3bis. In accordance with Article 4, paragraphs 1, 3, 4, 5 and 7, of the Convention, developing country Parties should undertake diversified enhanced mitigation actions/efforts in a measurable, reportable, and verifiable manner, in the context of sustainable development and supported and enabled by the provision of adequate finance, technology and capacity-building by developed country Parties.

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