I am passionate about technological details and how things work under the hood. Recently I didn’t get confirmative answers from AWS. I spent a half day to re-read the famous paper. and the new one Amazon DynamoDB: A Scalable, Predictably Performant, and Fully Managed NoSQL Database Service. I think the following several concepts can be helpful to under its predictable performance. Consistent Hashing and zero hop DHT Storage node and 10G partition Typical flow of putItem I also put all of the three pictures into a slides and put refereneres at the last slides.

I always thought SaaS are based shardig, load balance and multiple-tenant. In the past several days, I re-read Dynamo and DynamoDB papers to figure out some key info to share with my colleages to find a common ground about DynamoDB. One thing is mentioned many times in DynamoDB is token-bucket. Suddenly a thought popped out my mind when I walked back after lunch with my colleague that token-bucket algorithm should be a component of SaaS and multiple-tenant.

Best practice or "aws configure" will put ~/.aws/config and ~/.aws/credentials in the 600 mode. however if you follow Developing using a Docker image, you will get several errors e.g. cant' find region, reach endpoints, or no access to resources. I run docker command as a normal user, docker daemon run as root user. The below scripts will run a docker image which default user is glue_user (10000). the mounted volume ~/.

Microsoft FHIR Server serialize searchindices this way in cosmosdb. How to model it in AWS DynamoDB? { "id": "9240cda7-bbb7-4ad4-aa9f-971750a3dc71", "searchIndices": [ { "p": "_id", "c": "9240cda7-bbb7-4ad4-aa9f-971750a3dc71" }, { "p": "_lastUpdated", "st": "2018-08-22T23:37:56.1289012+00:00", "et": "2018-08-22T23:37:56.1289012+00:00" }, { "p": "patient", "r": "Patient/example" }, { "p": "performer", "r": "Practitioner/example" }, { "p": "related", "r_0": "Observation/example-genetics-1", "s_1": "http://hl7.org/fhir/observation-relationshiptypes", "c_1": "derived-from" }, { "p": "related-target", "r": "Observation/example-genetics-1" }, { "p": "related-type", "s": "http://hl7.org/fhir/observation-relationshiptypes", "c": "derived-from" }, { "p": "status", "s": "http://hl7.