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Performance Engineering Series – Tuning for Performance - Case Study – 5

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  JDK Nuances JDK upgrades is one of the most discussed topics as it is something that just cannot be changed without looking in to the code. This problem becomes more evident for large enterprise class applications. Despite the advances in JDK releases providing various optimizations / newer features, JDK8 we can still find JDK8 in being widely used.   This can perhaps be related to the development effort needed to upgrade the underlying code.   Even after taking the step of upgrading   / recompiling the code on newer JDK’s like JDK11, there still come some issues which arise due to the enhancements and we will look at one such instance today in this brief blog post.   To give a brief background this application is used for Indexing / Searching and uses Lucene to perform this task as I have described in the previous blog posts.    But one change from the previous posts was that the JDK was upgrade to JDK11 from JDK8 after which this particular problem started to surface. I h
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Performance Engineering Series – Tuning for Performance - Case Study - 1

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Introduction This series of articles will introduce the reader to explore more about Performance Engineering, specifically how to deal with actual issues of the product in a production deployment scenario.   This is the most discussed area and most of the people I have interacted with look forward to getting in to this role and deal with actual issues and make their contribution.   This work requires knowledge and understanding from a multitude of aspects like –        The product design         Usage profile of the product         CPU and Memory and Disk configuration of the platform         Software configuration – Memory settings         Connected software components and their impact The reader is expected to look at the problem holistically to make the best use of the resources being deployed and then tune the application to obtain the required performance.   As this spans a multitude of areas, extensive knowledge of all the areas is necessary and this comes mostly by experie
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Performance Engineering Series – Tuning for Performance - Case Study – 4

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 ActiveMQ Crash Introduction In this article let us look at an interesting case of ActiveMQ crashing and the symptoms it showed up and how it was resolved.   ActiveMQ is a widely used message broker that talks via a wide range of sources.   In the current context, its used for the purpose of sending email notifications where the test application places a message on the queue for it to be consumed by other interfacing applications for email notification delivery.   The ActiveMQ runs in redundant mode with active standby.   If a node goes down for any reason, the other node immediately picks up the processing and continues until it goes down.   ActiveMQ is initiated using a wrapper which was designed off a community release version and not the regular commercial deployment version.   The limitation of this would be explained later in the article.   Problem It was observed that the ActiveMQ queue fills up due to pending messages (or) the messages that cannot be delivered and end u
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