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About Deletes and Tombstones in Cassandra
Deleting distributed and replicated data from a system such as Apache Cassandra is far trickier than in a relational database. The process of deletion becomes more interesting when we consider that Cassandra stores its data in immutable files on disk. In such a system, to record the fact that a delete happened, a special value called a “tombstone†needs to be written as an indicator that previous
Amazon S3 Update – Strong Read-After-Write Consistency | Amazon Web Services
AWS News Blog Amazon S3 Update – Strong Read-After-Write Consistency When we launched S3 back in 2006, I discussed its virtually unlimited capacity (“…easily store any number of blocks…â€), the fact that it was designed to provide 99.99% availability, and that it offered durable storage, with data transparently stored in multiple locations. Since that launch, our customers have used S3 in an amazin
Point Software AG - LINUX FILESYSTEMS, PART 4 – EXT4 VS. EXT3 AND WHY DELAYED ALLOCATION IS BAD
It covers the main differences between ext3 and ext4 with a focus on filesystem consistency. This article was the initial motivation of this blog series, because many engineers are unaware that the standard option of ext4 (delalloc) is dangerous for their data! 4.1 Main differences Ext3 was available since 2001 with Linux Kernel 2.4.15 and extended ext2 with journalling to avoid filesystem corrupt
That massive filesystem thread - LWN.net
Long, highly-technical, and animated discussion threads are certainly not unheard of on the linux-kernel mailing list. Even by linux-kernel standards, though, the thread that followed the 2.6.29 announcement was impressive. Over the course of hundreds of messages, kernel developers argued about several aspects of how filesystems and block I/O work on contemporary Linux systems. In the end (your ed
ext4 and data loss [LWN.net]
The ext4 filesystem offers a number of useful features. It has been stabilizing quickly, but that does not mean that it will work perfectly for everybody. Consider this example: Ubuntu's bug tracker contains an entry titled "ext4 data loss", wherein a luckless ext4 user reports: Today, I was experimenting with some BIOS settings that made the system crash right after loading the desktop. After a c
Microsoft PowerPoint - 11a-cons-tx [Compatibility Mode]
Consistency in Distributed Systems Recall the fundamental DS properties – DS may be large in scale and widely distributed 1. concurrent execution of components 2. independent failure modes 3 t i i d l 3. transmission delay 4. no global time Consistency is an issue for both: li d bj • replicated objects • transactions involving related updates to different objects (recall ACID properties) We first
Eventual Consistencyã¾ã§ã®ä¸€è²«æ€§å›³è§£å¤§å…¨ - Qiita
Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article? TL;DR; Eventual Consistencyã¨ã‹è¨€ã„ãªãŒã‚‰ã©ã†ã›ã‚‚ã£ã¨ã¾ã¨ã‚‚ãªä¸€è²«æ€§å®Ÿè£…ã—ã¦ã‚‹ã“ã¨ã¯ã‚ˆãã‚ã‚‹ã‚“ã ã‹ã‚‰ã¿ã‚“ãªé©åˆ‡ãªåå‰ã‚’使ãŠã†ãœã€‚ ãªãœã“ã®è¨˜äº‹ã‚’書ãã®ã‹ NoSQLã®æ–‡è„ˆã«ãŠã„ã¦ã‚¹ã‚±ãƒ¼ãƒ©ãƒ“リティã¨ã®ãƒˆãƒ¬ãƒ¼ãƒ‰ã‚ªãƒ•ã§Eventual Consistencyã¨ã„ã†ç”¨èªžã¯çµæ§‹ãªé »åº¦ã§å‡ºã¦ãる。 ACIDã«å¯¾æŠ—ã—ã¦BASE(Basicaly Avalilable, Soft state, Eventual consistency)ãªã‚“ã¦è¨€è‘‰ãŒå‡ºã¦ããŸã‚Šã€CAP定ç†ã®ä¸ã®Aã¨Pã ã¨è¨€ã£ã¦ã¿ãŸã‚Šã€åˆ†æ•£ã‚·ã‚¹ãƒ†ãƒ ã®ã‚¹ã‚±ãƒ¼ãƒ©ãƒ“リテ
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ext4 and data consistency [LWN.net]
http://arxiv.org/pdf/1707.08514
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