Here I will explain the difference between Factory Method & Abstract Factory design patterns. If you want to know about difference between Simple Factory & Factory Method, you can check my previous post. Factory Method: As explained in previous post, Factory Method can be used when same standard process or set of business rules needs … Read more
Here I will explain the difference between Simple Factory & Factory Method design patterns. There are two things: Simple Factory: Simple Factory is not an official design pattern. It is more of a design principle that you should follow as part of Object Oriented design. One should code to interface, not to concrete implementation. That … Read more
Problem: We have a container pod running with a IAM role that has OpenSearch Serverless read/write data access on both collection items & indexes. Java application running within the container tries to access OpenSearch Serverless using standard opensearch-java & AWS Java sdks.But problem is that the Java client call to OpenSearch Serverless is failing with … Read more
I already wrote a post on how to connect to OpenSearch cluster (both AWS-hosted & non-AWS). Recently AWS launched OpenSearch Serverless & it is in GA phase now. So I thought of writing a quick post to show how to connect to serverless version of OpenSearch. It requires a little bit of change in the … Read more
Before we find out size of a Redis key & its value, let me clarify few things. In Redis, we can store data in two places. Redis stores data differently in memory & disk. While storing in RAM, there will be additional overhead for in-memory data structures that Redis use for fast data access. On … Read more
We will convert a Python datetime object to UNIX timestamp. Before coming to the actual solution which worked, I would like to discuss few other solutions I tried which didn’t work. Now you can ask why don’t you go to the actual solution right away? The thing is that other two solutions work in most … Read more
OpenSearch doesn’t support external versioning in Update request as of now. If you use HTTP command similar to below, you will get exception mentioned there. index1/_update/1?version=123&version_type=external { “doc”: {“title”: “updated title”}, } Validation Failed: 1: internal versioning can not be used for optimistic concurrency control. Please use if_seq_no and if_primary_term instead seq_no: Counter which gets … Read more
We will learn how to do upsert operation in OpenSearch. There are couple of ways to do it, one using Index operation & another using Update operation. But how they work is different. So we will have to choose carefully based on our use case. Upsert using Index operation: Index operation by default does upsert. … Read more
Here we will learn how to do common CRUD operations in OpenSearch using Java SDK. Basically we will learn how to create, update, index, get & delete document in OpenSearch from a Java application. By the way, this post is regarding CRUD operations on single document. For doing OpenSearch bulk operations in Java, I have … Read more
Here we will learn the basic code to do bulk operation in OpenSearch using Java SDK. We will need below dependencies in our Gradle project. This is part of build.gradle file. implementation ‘org.opensearch.client:opensearch-rest-client: 2.3.0’ implementation ‘org.opensearch.client:opensearch-java:2.0.0’ For maven projects, we need to add the dependencies in pom.xml file. As we know, OpenSearch provides bulk operation … Read more