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Butterfly numbers fall by 84% in Netherlands over 130 years – study | Environment | The Guardian
Europes CAP
According to Van Swaay, the study, published in Biological Conservation, confirms that “industrial agriculture is simply leaving hardly any room for nature” across the EU and in developed nations such as the US.
mass  extinction  ecological  disaster  crisis  insects  butterflies  biodiversity  Europe  CAP  industrial  agriculture 
24 days ago by asterisk2a
Metadata: Chain replication for supporting high throughput and availability
With chain replication, the primary's role in sequencing requests is shared by two replicas. The head sequences update requests; the tail extends that sequence by interleaving query requests. This sharing of responsibility not only partitions the sequencing task but also enables lower-latency and lower-overhead processing for query requests, because only a single server (the tail) is involved in processing a query and that processing is never delayed by activity elsewhere in the chain. Compare that to the primary backup approach, where the primary, before responding to a query, must await acknowledgements from backups for prior updates.

Chain replication is at a disadvantage for reply latency to update requests since it disseminates updates serially, compared to primary-backup which disseminates updates parallelly. This does not have much effect on throughput however. (It is also possible to modify chain replication for parallel wiring of middle-servers, but this will bring some complexity to the fault-handling actions.)
CAP  SystemDesign  Replication  ChainReplication 
10 weeks ago by colin.jack
CQRS, Event Sourcing and DDD FAQ - Your command-query responsibility segregation & DDD questions answered
The ideas around CQRS are fascinating, but different enough from the way we do conventional development that some questions come up again and again. This page collect a number of such questions that we've encountered, and attempts to give accurate and satisfactory answers to them.
aggregates  bounded  cap  commands  consistensy  cqrs  ddd  domain  design  event  events  sagas  sourcing  transaction 
11 weeks ago by fmjrey

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