The consensus algorithm solves the process of agreeing on a proposal (proposal). PBFT (Byzantine fault-tolerant) algorithm-fabric 0.6 adopts
Five stages: request, pre-preparation (Pre-prepare), preparation (prepare), and confirmation (commit), reply
Steps:1. From the full network node to elect a master node (Leader), the new area block by the main node responsible for generation2.pre-prepare: Each node sends the transaction from the client to the who
Block data synchronization is divided into passive synchronization and active synchronous passive synchronization refers to the local node receives some messages from other nodes, and then requests the chunk information. Like Newblockhashesmsg.
Active synchronization refers to the node actively requesting chunk data from other nodes, such as the syning at the start of Geth, as well as the runtime timing and synchronization of neighboring nodes.
Passiv
1. RAC global wait Event Description
In the RAC environment, the most common wait events related to global cache adjustment are global cache Cr request, global cache busy, and equeue.
When a process needs to access one or more blocks, Oracle first checks whether the block exists in its cache, the shared access permission is granted to these blocks through global cache before access. If we find that these blocks are already in the cache of another ins
type Test constructor, and the int parameter constructor calls the constructor of the string type.So print 2 first, then return to the constructor of type int to print 3, and finally return to the empty argument constructor to print 1. Printed results: 2 3 1Instance Block:The initialization code, executed at the time of the new object, is executed earlier than the construction.Can be written in a number of executions, executed in order, in front of the first execution, after the subsequent exec
The author of 16 began to focus on block chain technology, block chain of typical representatives, is also the most familiar is the bitcoin, bitcoin from the beginning no one knew the hot world, China's national mining, the ZF ban trading, to now abroad or wind, bitcoin from the beginning of trading to now should be the longest-growing "futures" bar, Many programmers feel that they missed out on a chance to
Reproduced from: http://blog.csdn.net/qq_35624642/article/details/78175907
A complete entry finishing posts, so everywhere to collect some feel pretty good to come, directly linked to the link should not be tort barIntroduction and Principle:One, bit currency 1. Bitcoin White Paper This is the beginning of everything 2. Proficient in the bit currency of a very detailed book, read the basic understanding of Bitcoin. 3. Introduction to Theproof-of-work Concept POW mechanism theory, English 4. The
Mobile Internet has grown to this year, app has become the mainstream trend. Block chain bully Screen now, app will become the protagonist. According to the relevant data organization APPBI released the Block chain app report in the US-China App Store. Data show that China and the United States in the application market and block chain related to the 2,993 of the
When we use Firbug to browse other people's websites, we find that designers use inline-block in many places. We all know that inline is a declaration div is an inline object, block is a declaration of the object, then what the Inline-block meaning, that is, inline and block. Next, let's take a test to understand the d
The Display:block block element will have a single row, and multiple block elements will have their own new row. By default, the block element width automatically fills the width of its parent element.The block element can set the Width,height property. Block-level elements,
Oracle Database EXP Export DMP file corrupt existence bad block/corruption skip DMP bad block by CPFL tool importIn some cases, it is known that data can be recovered from a table of damaged DMP files through Dul, but there are many problems with this method, especially for many data types, such as Lob,long raw type, etc., and the possibility of recovering large amounts of data loss, I through the analysis
One, synchronized synchronous statement block:
Before introducing the synchronization statement block, do an experiment to verify that the order in which multiple threads call the same synchronization method is random.
Example one:
1) Mylist.java
2) Test:
It is visible that the code in the synchronization method is printed synchronously, but thread A and thread B are executed asynchronously, which may cau
maintainability Comparison
The maintainability of block chain mainly examines five aspects, such as imprinting management, System management, strategy management, intelligent contract, and ease of deployment.
(i) Emergency Management: commercial block chain a emergency management system, commercial block chain B and fabric without emergency management system
Emer
What is a smart contractAn intelligent contract is a set of commitments in digital form (promises), including agreements in which contract participants can implement these commitments. A contract consists of a set of code (a function of the contract) and data (the state of the contract) and runs on the etheric square virtual machine.
The Ethernet square virtual machine (EVM), which uses a 256-bit-length machine code, is a stack based virtual machine for the implementation of the etheric Square I
The development of the block chain is actually the history of the development of data records, today we will talk about the history of data recording development, a glimpse of this spiraling trend
Data is a symbolic representation of an objective thing, an unprocessed raw material used to represent an objective thing, such as graphic symbols, numbers, letters, and so on. Or, data is the fact and concept of physical observation, a description of place
According to the three-party circulation platform forecast, by 2022, the global block chain market size will reach 13.96 billion U.S. dollars. In 2017-2022, the market grew at an annual compound rate of 42.8%.
The report argues that in the financial sector, the application of block chain technology is expanding, mainly including financial transactions and cross-border payments.
At the same time, the int
As the connection foundation between reality and Virtual world, IoT has been paid close attention to. Whether it is artificial intelligence revolution or block chain technology, the Internet of things will be the underlying architecture, providing valuable, available digital resources, but up to now, the internet of things still faces too many problems to be solved.
The first is the problem of fragmentation. From the day the Internet of things was bo
Inline conversion to block: Display: block or float: left/right
Bulk conversion to inline: Display: inline;
However, you must note that the width and height cannot be set for inline elements. It is necessary to forcibly convert inline elements into block-level elements.
A block-level element such as Div automatically
Label: style http io color ar use sp for strongDisplay: block indicates that an element is displayed as a block-level element.The block element has the following features:Always starts on a new line;Height, row height, and top and bottom margins can be controlled;The default width is 100% of its container, unless a width is set.Display: inline is to display the e
Display:block is the display of elements as block-level elements.The block element is characterized by:Always start on a new line;Height, row height and top and bottom margin can be controlled;The width defaults to 100% of its container unless a width is setDisplay:inline is to display elements as inline elements.The features of the inline element are:And the other elements are on one line;Height, row heigh
Display:block is the display of elements as block-level elements.The block element is characterized by:Always start on a new line;Height, row height and top and bottom margin can be controlled;The width defaults to 100% of its container unless a width is setDisplay:inline is to display elements as inline elements.The features of the inline element are:And the other elements are on one line;Height, row heigh
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