I am learning Sequential Consistency in Distributed Systems but just could not understand the terms explained. I would appreciate if someone can shed some light in layman's term on why (a) and (c) below are sequentially consistent and (b) is not. Thanks.
Related Questions in SEQUENTIAL
- Elasticsearch schema for multiple versions of the same text
- Elasticsearch nested filter query
- Elasticsearch data model
- search with filter by token count
- Usage of - operator in elasticsearch
- Running multiprocessing on two different functions in Python 2.7
- How to get an Elasticsearch aggregation with multiple fields
- How to implement custom sort in elasticsearch?
- Custom Analyzer not working Elasticsearch
- How to implement full text search using Elasticsearch in Rails?
Related Questions in DISTRIBUTED-SYSTEM
- Elasticsearch schema for multiple versions of the same text
- Elasticsearch nested filter query
- Elasticsearch data model
- search with filter by token count
- Usage of - operator in elasticsearch
- Running multiprocessing on two different functions in Python 2.7
- How to get an Elasticsearch aggregation with multiple fields
- How to implement custom sort in elasticsearch?
- Custom Analyzer not working Elasticsearch
- How to implement full text search using Elasticsearch in Rails?
Related Questions in CONSISTENCY
- Elasticsearch schema for multiple versions of the same text
- Elasticsearch nested filter query
- Elasticsearch data model
- search with filter by token count
- Usage of - operator in elasticsearch
- Running multiprocessing on two different functions in Python 2.7
- How to get an Elasticsearch aggregation with multiple fields
- How to implement custom sort in elasticsearch?
- Custom Analyzer not working Elasticsearch
- How to implement full text search using Elasticsearch in Rails?
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
Popular Tags
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
An execution
e
of operations is sequentially consistent if and only if it can be permutated into a sequences
of these operations such that:the sequence
s
respects the program order of each process. That is, for any two operationso1
ando2
which are of the same process and ifo1
precedeso2
ine
, theno1
should be placed beforeo2
ins
;in the sequence
s
, each read operation returns the value of the last preceding write operation over the same variable.For (a),
s
can be:W(x)b [P2], R(x)b [P3], R(x)b [P4], W(x)a [P1], R(x)a [P3], R(x)a [P4]
For (c),
s
can be:W(x)a [P1], R(x)a [P2], R(x)a [P3], R(x)a [P4], W(x)b [P3], R(x)b [P1], R(x)b [P2], R(x)b [P4]
However, for (b):
the operations
R(x)b, R(x)a
fromP3
require thatW(x)b
come beforeW(x)a
the operations
R(x)a, R(x)b
fromP4
require thatW(x)a
come beforeW(x)b
It is impossible to construct such a sequence
s
.