HackerNews Summary (2023-05-09 12PM)

Source: Companies hide negative news by issuing unrelated press releases alongside SEC filings, study shows

Summary
Companies tend to release unrelated press releases on the same day they file negative news with the SEC via Form 8-K to distract investors, according to a new study by the University of Notre Dame. The research highlights that managers commonly issue concurrent unrelated press releases when they have strong incentives to divert investors’ attention away from 8-Ks disclosing negative news, including when they have an upcoming stock sale.

Fact

🏦 Managers tend to use unrelated press releases to divert attention from the harder-to-read negative regulatory filings.

📢 About 33% of 8-Ks were accompanied by a same-day, unrelated press release.

📅 Managers file 8-Ks with negative news during periods with low investor attention, typically on Fridays or after-market hours.

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Source: Syncthing

Summary
This service is private, encrypted, and authenticated for secure communication. Your data is only stored on your devices, communication is encrypted using TLS with perfect forward secrecy, and only devices explicitly allowed can connect to each other.

Fact

🔒 All communication is secured using TLS encryption with perfect forward secrecy.

🔑 Every device is identified by a strong cryptographic certificate.

💻 Your data is only stored on your own computers. There is no central server to be compromised.

🤝 Only devices explicitly allowed can connect to each other.

🛡️ More information on security concerns can be found on the security page.

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Source: Call for Participation

Summary
Das Chaos Communication Camp findet wieder statt und lädt zur Einreichung von Vorträgen ein. Es wird fünf Channel-Bühnen geben, auf denen verschiedene Themen behandelt werden, darunter Technik, Hacking, Nachhaltigkeit und digitale Rechte. Besonders FLINTA*, queere, BIPOC und Menschen aus dem globalen Süden sind ermutigt, sich zu bewerben. Der CfP endet am 09. Juni 2023.

Facts

📢 Es werden Einreichungen von Vorträgen, Workshops oder Lightning Talks erwartet.

🌍 Das Camp richtet sich an ein internationales Publikum und wird auf Deutsch und Englisch präsentiert.

🧑‍🤝‍🧑 Die Channels Milliways, Digitalcourage, Jugend hackt, Bits & Bäume und N:O:R:T:x freuen sich auf Beiträge.

🚩 Insbesondere FLINTA*, queere, BIPOC und Menschen aus dem globalen Süden sind ermutigt, sich mit Beiträgen zu bewerben.

📅 Der CfP endet am 09. Juni 2023, eine Rückmeldung erfolgt einen Monat später.

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Source: Is sequential IO dead in the era of the NVMe drive? — Jack Vanlightly

Summary
Apache Kafka and BookKeeper use different approaches to achieve sequential IO. While BookKeeper writes to the WAL and long-term storage on different disks, Kafka maps one partition to one active segment file using asynchronous disk writing. However, even with high-performance SSDs, the access pattern can still affect performance due to required housekeeping such as wear leveling and garbage collection.

Facts

💾 BookKeeper writes to WAL and long-term storage on separate disks.

💾 Kafka maps one partition to one active segment file using asynchronous disk writing.

💾 High-performance SSDs are not agnostic to access patterns and require wear leveling and garbage collection.

💾 Wear leveling prevents NAND blocks from being worn out by relocating hot data to less worn out blocks.

💾 Garbage collection rewrites blocks of data when fragmentation causes a lack of free blocks.

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