Sometimes we may need to override build functionality of lombok builder. It could be helpful to avoid additional call of some functionality after calling build(). Here is the example of usage:

Gatling is another trendy stress-test tool, which can be used for simple scenarios, as well as for complex scenarios. Quick start tutorial can be followed from here

Amazon Athena is an interactive query service that makes it easy to analyze data in Amazon S3 using standard SQL. Athena is a serverless infrastructure that allows us to run SQL on S3 files. Athena helps to analyze unstructure, semi-structured and structured data stored in Amazon S3 (such as CSV, JSON, columnar data formats, Apache Parquet, Apache ORC). Detail references can be read from official aws web-page

I was doing regular scale-up operation by adding two instances with higher CPU than existing two nodes. After adding I was planning to step-by-step remove the old nodes with lower performance. Everything was going smooth, I have added two nodes, did setting for each bucket to have a one replica and pushed rebalance. It took a quite long, I’m not even sure, since it was DEV environment, I just went home. Next day early morning I saw it was finished and balanced. So now I have started removing the old nodes. First I have ordered to old_node_1 to REMOVE and then pushed REBALANCE. It took about 2 hours and it went down. So now I have asked to second old node to be REMOVE and pushed REBALANCE. So another long 2 hour rebalancing process has started I thought. While waiting for that I have decided to remove the old_node_1 which is already out of the cluster. Here the BIG MISTAKE happened. I have logged in to the new_node_2 and stoped the service sudo service couchbase-server stop

Another good example of modifiying classical algorithm in order to reach the goal. In this example we have twisted task where binary-search algorithm should be modified with additional edge case checks. leetcode

There are saying that “if you understand component scan, you understand spring framework”. It is quite true since main advantage of spring framework is lies on dependency injection. To do the dependency injection the packages must be scanned for necessary beans. Obviously when the project is big (mostly multiple projects are used together) there are many beans are necessary for scan. There are two methods for bean scanning in spring:

I have been facing the “Couchbase health check failed” error, which I have never seen so far:

Given an array nums of n integers and an integer target, find three integers in nums such that the sum is closest to target. Return the sum of the three integers. You may assume that each input would have exactly one solution. from leetcode

This is one of the medium level problem regarding to palindromes, where we have to find longest substring palindrome of the given string.leetcode