Today we continue discussing the AWS papers on software architecture which suggests five pillars:
- Operational Excellence for running and monitoring business critical systems.
- Security to protect information, systems, and assets with risk assessments and mitigation strategies.
- Reliability to recover from infrastructure or service disruptions
- Performance Efficiency to ensure efficiency in the usage of resources
- Cost Optimization to help eliminate unneeded cost and keeps the system trimmed and lean.
The guidelines to achieve the above pillars include:
1. Infrastructure capacity should be estimated not guessed
2. Systems should be tested on production scale to eliminate surprises
3. Architectural experimentation should be made easier with automation
4. There should be flexibility to evolve architectures
5. Changes to the architecture should be driven by data
6. Plan for peak days and test at these loads to observe areas of improvement
It should be noted that Amazon's take on architecture is that there is no need for centralized decisions as described by TOGAF or the Zachman Framework. TOGAF is a framework that pools in requirements from technology vision, business demands, deployment and operations, implementations, migrations and upgrades to form central recommendations The Zachman framework provides a table with columns such as why, how, what, who, when, and rows as layers of organization so that nothing is left out of the considerations from architecture point of view. There are definitely risks associated with the distributed recommendations where internal teams may not adhere to strict standards. This is mitigated in two ways - there are mechanisms that carry out automated checks to ensure standards are being met and second - a culture that work backwards from the customer focused innovation.
#codingexercise
We were discussing finding the largest sum submatrix in a matrix of integers.
As we evaluated the growing range from column to column, we iterated inwards to outwards but the reverse is more efficient.
The advantage here is that the outer bounds of the entire matrix has the largest possible array to apply Kadane's algorithm which we discussed earlier as the one used for finding the max subarray.
Since we find the maximum subarray (i1,i2) along the rows and (j1,j2) along the columns at the first and last row and column of the matrix, the submatrix with the largest sum will lie within (i1,j1) and (i2,j2). We merely refine it with every iteration that shrinks the matrix.
Note that we can use the min common (i-topleft,j-topleft) and (i-bottom-right,j-bottom-right) from the first and last row and column subarray determinations.
- Operational Excellence for running and monitoring business critical systems.
- Security to protect information, systems, and assets with risk assessments and mitigation strategies.
- Reliability to recover from infrastructure or service disruptions
- Performance Efficiency to ensure efficiency in the usage of resources
- Cost Optimization to help eliminate unneeded cost and keeps the system trimmed and lean.
The guidelines to achieve the above pillars include:
1. Infrastructure capacity should be estimated not guessed
2. Systems should be tested on production scale to eliminate surprises
3. Architectural experimentation should be made easier with automation
4. There should be flexibility to evolve architectures
5. Changes to the architecture should be driven by data
6. Plan for peak days and test at these loads to observe areas of improvement
It should be noted that Amazon's take on architecture is that there is no need for centralized decisions as described by TOGAF or the Zachman Framework. TOGAF is a framework that pools in requirements from technology vision, business demands, deployment and operations, implementations, migrations and upgrades to form central recommendations The Zachman framework provides a table with columns such as why, how, what, who, when, and rows as layers of organization so that nothing is left out of the considerations from architecture point of view. There are definitely risks associated with the distributed recommendations where internal teams may not adhere to strict standards. This is mitigated in two ways - there are mechanisms that carry out automated checks to ensure standards are being met and second - a culture that work backwards from the customer focused innovation.
#codingexercise
We were discussing finding the largest sum submatrix in a matrix of integers.
As we evaluated the growing range from column to column, we iterated inwards to outwards but the reverse is more efficient.
The advantage here is that the outer bounds of the entire matrix has the largest possible array to apply Kadane's algorithm which we discussed earlier as the one used for finding the max subarray.
Since we find the maximum subarray (i1,i2) along the rows and (j1,j2) along the columns at the first and last row and column of the matrix, the submatrix with the largest sum will lie within (i1,j1) and (i2,j2). We merely refine it with every iteration that shrinks the matrix.
Note that we can use the min common (i-topleft,j-topleft) and (i-bottom-right,j-bottom-right) from the first and last row and column subarray determinations.
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