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Links for 2019-07-29

  • AWS S3 Event Notifications have “probably once” delivery

    you get the following Messages that are delivered once; Messages that are delivered multiple times; Messages that are not delivered This is in fact equivalent to “no guarantees at all” but the phrase “probably once” has a certain appeal to it. In my case I have an application that writes files to S3 at a regular interval. These files are processed by a lambda so they can be loaded into a database. This database is ultimately used in a customer facing application, so any duplicates gets noticed very quickly. Somehow I needed to come up with a way to deal with this pecuilar behavior of S3 Event Notifications.
    Christ, what a mess. Sounds like S3 Event Notifications are best ignored for production use. Disappointing :(

    (tags: aws s3 event-notifications consistency durability reliability ops)

  • Loss of Arctic’s Reflective Sea Ice Will Advance Global Warming by 25 Years

    “Losing the reflective power of Arctic sea ice will lead to warming equivalent to one trillion tons of CO2 and advance the 2ºC threshold by 25 years. Any rational policy would make preventing this a top climate priority for world leaders,” said Ramanathan, a professor of atmospheric and climate sciences at Scripps. [….] Computer forecast models are actually underestimating the extent of this trend.  “We analyzed 40 climate models from modeling centers around the world,” said Eisenman, a professor of climate, atmospheric science, and physical oceanography at Scripps. “Not a single one of the models simulated as much Arctic sea ice retreat per degree of global warming as has been observed during recent decades.”

    (tags: arctic climate-change climate global-warming fear ice earth)

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