amazon-dynamodb

问题 In my Spring Batch application I have written a CustomItemWriter which internally writes item to DynamoDB using DynamoDBAsyncClient, this client returns Future object. I have a input file with millions of record. Since CustomItemWriter returns future object immediately my batch job exiting within 5 sec with status as COMPLETED, but in actual it is taking 3-4 minutes to write all item to the DB, I want that batch job finishes only after all item written to DataBase. How can i do that? job is

问题 I am pulling data from an API in batches and sending it to an SQS Queue. Where I am having an issue is processing the message in order to send the data to DynamoDB. There is supposed to be 147,689 records in the dataset. However, when running the code, sometimes less than 147,689 records will be put to DynamoDB, sometimes more than 147,689 records will be put to DynamoDB, and sometimes 147,689 records will be put to DynamoDB. It is not consistently putting 147,689 records into the database. I

问题 #if($inputRoot.objectType == 'Test'), "TableName": "StudentTests", #else,"TableName": "UserActions", #end if use if condition i got an error in postman link ## "__type": "com.amazon.coral.service#SerializationException" ## 回答1: The way I understand your question I would do : #if($inputRoot.objectType == "Test") #set($tableName = "StudentTests" #else #set($tableName = "UserActions" #end { "TableName": "$tableName", "Key": ... } 来源： https://stackoverflow.com/questions/55546882/how-to-use-if

问题 I am trying to filter list of maps from a dynamodb table which is of the following format. { id: "Number", users: { { userEmail: abc@gmail.com, age:"23" }, { userEmail: de@gmail.com, age:"41" } } } I need to get the data of the user with userEmail as "abc@gmail.com". Currently I am doing it using the following dynamodb query. Is there any another efficient way to solve this issue ? var params = { TableName: 'users', Key:{ 'id': id } }; var docClient = new AWS.DynamoDB.DocumentClient();

问题 I am using AWS-lambda handler to write a dynamoDB stream to mongoDB. I want to define the db connection outside of the handler so that the requests reuse the same connections, based on our expected throughput volume. The problem with the lambda containers will expire without disposing of the connections properly. Does anybody know of any good solutions for this problem? Essentially boils down to "I want to use connection pools without maxing out the connection limit" 回答1: When I faced with

问题 How can I get sum and average of packSOC and totalKw? I am using dynamoDB as database but in my understanding dynamoDB does not support aggregate. How can I get average and sum of packSOC and totalKw.[Not possible to use for loop on result because result has so many data in it]. 回答1: At this time DynamoDB doesn't support this aggregation features. If you want to collect these values you either have to keep track of them elsewhere or do the very inefficient collection scan and calculate it.

问题 I'm trying to write a DAO for DynamoDB using Java 8 and there seems to be several ways. Classes are primarily defined under the following two packages: com.amazonaws.services.dynamodbv2 software.amazon.awssdk.services.dynamodb Both of them appear to be doing what I'd like - but since I'm starting fresh, I'd rather choose the latest one I've looked at these two links: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GettingStarted.Java.03.html https://docs.aws.amazon.com/sdk

问题 I am new to DynamoDB and wanted to know how can we query on a table in DynamoDB with IN clause using Java. I have a table named items. It`s schema is 1. Product (Partition Key of type String) 2. ID (Sort Key of type int) 3. Date ( attribute of type String) I want to query similar to SELECT ID FROM items WHERE Product IN ("apple","orange"). or SELECT Product FROM items WHERE ID IN (100,200). 回答1: As the requirement is to get the products without the partition key, there are two options

问题 I am new to DynamoDB and wanted to know how can we query on a table in DynamoDB with IN clause using Java. I have a table named items. It`s schema is 1. Product (Partition Key of type String) 2. ID (Sort Key of type int) 3. Date ( attribute of type String) I want to query similar to SELECT ID FROM items WHERE Product IN ("apple","orange"). or SELECT Product FROM items WHERE ID IN (100,200). 回答1: As the requirement is to get the products without the partition key, there are two options

问题 I am new to DynamoDB and wanted to know how can we query on a table in DynamoDB with IN clause using Java. I have a table named items. It`s schema is 1. Product (Partition Key of type String) 2. ID (Sort Key of type int) 3. Date ( attribute of type String) I want to query similar to SELECT ID FROM items WHERE Product IN ("apple","orange"). or SELECT Product FROM items WHERE ID IN (100,200). 回答1: As the requirement is to get the products without the partition key, there are two options