While running Oozie workflow job, I got failed as following:
But I cannot find the error log.
After searching information, I got solution.
For more detailed output, check application tracking page with following url:
Then you can choose or search any job you want to check and detailed information will occur!
Lateral View syntax
lateralView: LATERAL VIEW udtf(expression) tableAlias AS columnAlias (',' columnAlias)* fromClause: FROM baseTable (lateralView)*
Continue reading “Hive Lateral view Introduction”
log4j:WARN No appenders could be found for logger
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
log4j need a configure file to tell it how to work.
Continue reading “Hadoop error: log4j:WARN No appenders could be found for logger”
Currently, I did some practise about Hadoop and met some erorrs. Like this, I can run the Hadoop application with terminal on HDFS, but I cannot run it locally with eclipse for following errors:
Continue reading “Hadoop Error: java.lang.ClassNotFoundException:org.codehaus.jackson.map.JsonMappingException”
What is MapReduce
- Programming paradigm
- Designed to solve one problem
- Created by Google
- Two parts: Map and Reduce
Continue reading “Hadoop Note 4: MapReduce”
Java Virtual Machines
- Haddop processes run in separate JVMs
- JVMs do not share state- different Hadoop processes run in separate JVMs.
- JVM processes differ between Hadoop 1.0 and 2.0
Continue reading “Hadoop Note 3: Core”
What is Hadoop
Two components plus projects
- Open-source data storage: HDFS(Hadoop File System)
- Precessing API: MapReduce
- Other projects/libraries: HBase, Hive, Pig, etc.
Continue reading “Hadoop Note 2: Introducing Hadoop”
Understanding RDBMS Limits
- Sophisticated processing
Continue reading “Hadoop Note 1: Database Choices”
While using django-haystack to connect solr as search engine, there happens an error Continue reading “An error while running django-haystack”
title: Introduction Stock Search App on Android
description: for my own project
— Continue reading “Introduction Stock Search App on Android”