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Learning Apache Apex

You're reading from   Learning Apache Apex Real-time streaming applications with Apex

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Product type Paperback
Published in Nov 2017
Publisher
ISBN-13 9781788296403
Length 290 pages
Edition 1st Edition
Languages
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Authors (5):
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Munagala V. Ramanath Munagala V. Ramanath
Author Profile Icon Munagala V. Ramanath
Munagala V. Ramanath
David Yan David Yan
Author Profile Icon David Yan
David Yan
Ananth Gundabattula Ananth Gundabattula
Author Profile Icon Ananth Gundabattula
Ananth Gundabattula
Thomas Weise Thomas Weise
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Thomas Weise
Kenneth Knowles Kenneth Knowles
Author Profile Icon Kenneth Knowles
Kenneth Knowles
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Toc

Table of Contents (11) Chapters Close

Preface 1. Introduction to Apex FREE CHAPTER 2. Getting Started with Application Development 3. The Apex Library 4. Scalability, Low Latency, and Performance 5. Fault Tolerance and Reliability 6. Example Project – Real-Time Aggregation and Visualization 7. Example Project – Real-Time Ride Service Data Processing 8. Example Project – ETL Using SQL 9. Introduction to Apache Beam 10. The Future of Stream Processing

Understanding application logs


When the test is run, it generates a copious amount of log messages. Understanding this output is invaluable for debugging and troubleshooting purposes, we will discuss some important elements of these messages next. This section is, unavoidably, rather dense since it delves into the content of log files generated by the application, but it will be invaluable for developers since they will need to understand these log files for troubleshooting and optimization.

Early in the message output you will see ZooKeeper starting up:

2017-10-29 07:49:40,878 [main] INFO  server.ZooKeeperServer <init> - Created server with tickTime 500 minSessionTimeout 1000 maxSessionTimeout 10000 datadir /tmp/zookeeper-snapshot2513970348898676323/version-2 snapdir /tmp/zookeeper-logs2532702519793579042/version-22017-10-29 07:49:40,951 [main] INFO  server.NIOServerCnxnFactory configure - binding to port localhost/127.0.0.1:39429

This will be followed by a long list of Kafka configuration...

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