The industry has seen cutting-edge Application Performance Monitoring tools and infrastructure monitoring tools. These monitoring tools are great at answering the question: 'What is the problem?'' but not, Why does the problem happen? yCrash attempts to answer this question. It captures 360-degree artifacts from your technology stack such as Garbage collection logs, thread dumps, heap dumps,... Continue Reading →
yCrash app is a non-intrusive, secure, instant root cause analysis tool. It captures thread dump, heap dump, GC log, netstat, vmstat, top, and several more artifacts, right when the problem is happening in the production. It instantly analyzes all the artifacts & generates a root cause analysis report in the dashboard. Watch this below video... Continue Reading →
In this series of simulating and troubleshooting performance problems in Kotlin articles, let’s discuss how to simulate CPU consumption to spike up to 100% on a host (or container). CPU consumption will spike up whenever a thread goes on an infinite loop. Kotlin CPU Spike Program Here is a sample kotlin program, which generates the... Continue Reading →
Recently we encountered a production in an application. This application was connecting to multiple systems of records (SOR). Oracle RAC cluster is one of the primary systems of record. This Oracle RAC cluster was slowing down due to resource constraints. This slowdown in the Oracle RAC cluster degraded the entire application's response time. In this... Continue Reading →
Apache PDFBox is a popular open-source library that facilitates java applications to work with PDF documents. Recently we encountered a Deadlock that surfaced in this library. In this post we have shared how we troubleshooted and identified the root cause of the problem. What is Deadlock? First let's try to understand what 'Deadlock' means. Several... Continue Reading →
All multi-threaded applications are prone to deadlock. Modern Kotlin platform is no exception to it. In this post let’s discuss how to simulate a deadlock in Kotlin and how you can troubleshoot it. What is Deadlock? First let's try to understand what 'Deadlock' means. Several technical definitions aren’t clear. ‘Deadlock’ is one among them ;-).... Continue Reading →
JVM memory has following regions: Fig: JVM memory regions a. Young Generation b. Old Generation c. Metaspace d. Others region When you encounter 'java.lang.OutOfMemoryError: Metaspace' it indicates that the Metaspace region in the JVM memory is getting saturated. Metaspace is the region where metadata details that are required to execute your application are stored. In... Continue Reading →
java.lang.String#intern() is an interesting function in Java. When used at the right place, it has potential to reduce overall memory consumption of your application by eliminating duplicate strings in your application. To learn how intern() function works, you may refer to this blog. In this post let's discuss the performance impact of using java.lang.String#intern() function... Continue Reading →
intern() is an interesting function in java.lang.String object. intern() function eliminates duplicate string objects from the application and has potential to reduce overall memory consumption of your application. To understand how string intern() function works you may refer to this interesting blog. Intern strings are stored in a string pool in the JVM memory. JVM... Continue Reading →
intern() is an interesting function in java.lang.String object. intern() function eliminates duplicate string objects from the application and has potential to reduce overall memory consumption of your application. In this post, let's learn more about this intern() function. 1. How does the String intern() function work? In Java heap memory, a pool of string objects... Continue Reading →
JVM Memory has following regions: a. Young Generation b. Old Generation c. Metaspace d. Others region Fig: JVM memory regions To see what objects are stored in what region, you may refer to this video clip. Sometimes your application might run into 'java.lang.OutOfMemoryError: Metaspace' as discussed in this post. In such circumstances you might want... Continue Reading →
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. Different types of OutOfMemoryError JVM memory has following regions: a. Young... Continue Reading →
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