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https://phoenix.apache.org/transactions.html
Transactions (beta) Above and beyond the row-level transactional semantics of HBase, Phoenix adds cross row and cross table transaction support with full ACID semantics by integrating with Tephra, now an Apache incubator project. Tephra provides snapshot isolation of concurrent transactions by implementing multi-versioned concurrency control.
https://www.quora.com/How-does-HBase-support-transactions
Sep 20, 2018 · HBase provides atomicity of mutations (puts/writes) on a per row basis, even if the put operation spans across multiple column families. However, no transactional guarantee is provided for mutations across rows. In HBase, although the data is stored on a deep storage like HDFS, the writes always go through a set of servers called region servers.
https://hbase.apache.org/acid-semantics.html
[2] In the context of Apache HBase, "durably on disk" implies an hflush() call on the transaction log. This does not actually imply an fsync() to magnetic media, but rather just that the data has been written to the OS cache on all replicas of the log.
https://www.slideshare.net/alexbaranau/transactions-over-hbase
Apr 09, 2014 · Learn how to add transactions support for Apache HBase Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website.
https://hadoop-hbase.blogspot.com/2012/03/acid-in-hbase.html
Mar 21, 2012 · HBase supports ACID in limited ways, namely Puts to the same row provide all ACID guarantees. (HBASE-3584 adds multi op transactions and HBASE-5229 adds multi row transactions, but the principle remains the same) So how does ACID work in HBase? HBase employs a kind of MVCC. And HBase has no mixed read/write transactions.Author: Lars Hofhansl
https://www.quora.com/What-is-Apache-HBase-1
Jun 03, 2014 · HBase is designed to support high table-update rates and to scale out horizontally in distributed compute clusters. Its focus on scale enables it to support very large database tables. It has an extremely fault-tolerant way of storing data and is extremely good for storing sparse data.
https://www.slideshare.net/alexbaranau/intro-to-hbase
Jul 09, 2012 · Intro to HBase 1. Intro to HBase Alex Baranau, Sematext International, 2012Monday, July 9, 12 ... Row updates are atomic Updates across multiple rows are NOT atomic, no transaction support out of the box HBase stores N versions of a cell (default 3) Tables are usually “sparse”, not all columns populated in a rowMonday, July 9, 12 ...
https://stackoverflow.com/questions/2212230/transactions-in-nosql
The old example of using a database transaction to wrap the transfer of money from one bank account to another is total bull. The correct solution is to store a list of ledger events (transfers between accounts) and show the current balance as a sum of the ledger.
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