Troubleshooting Microservice’s OutOfMemoryError: Metaspace

Recently we confronted an interesting ‘java.lang.OutOfMemoryError: Metaspace’ problem in a Microservice application. This Microservice application will run smoothly for initial few hours, later it will start to throw java.lang.OutOfMemoryError: Metaspace. In this post let me share the steps we pursued to troubleshoot this problem.

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Is today’s microservice more bloated than yesterday’s monolith?

I am slightly hesitant to write this post, as it might attract some criticism. Nevertheless, I told myself there is nothing wrong with sharing my point of view (even though it might not be well accepted). I would like to share my personal experience regarding yesterday’s Monolithic and today’s Microservice architecture in this post.

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HOW MUCH MEMORY IS MY APPLICATION WASTING?

In early 1970s 1 MB was costing 1 million $. Now 1 mb is costing fraction of that cost. There is no comparison. This is one of the reasons why engineers and enterprises don’t worry about memory any more. 1 million $ in 1970s might be equivalent of several millions of dollars’ worth today. Thus, back in the day’s memory was treated so preciously. This preciousness has been vividly described in the book ‘Idea Man’ – autobiography of Paul Allen (Microsoft Co-founder). Paul Allen talks about the challenge he and Bill Gates faced in writing BASIC programming language (Microsoft’s very first product) under 4 KB.

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