Monthly Archives: December 2015

Phoenix and HBase

HBase HBase is a distributed column-oriented database built on top of HDFS. One of the most popular NoSQL databases Hadoop application to use when you require real-time read/write random access to very large datasets. It is built from the ground … Continue reading

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Hands on Flume

Intro Flume can be used to transport massive quantities of event data. A Flume event is defined as a unit of data flow. A Flume agent is a (JVM) process that hosts the components through which events flow from an … Continue reading

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Customize email alerts in ambari

Add the xml file – alert-templates-custom.xml ¬†under¬† /var/lib/ambari-server/resources/ Edit ambari.properties file under /etc/ambari-server/conf/ and add the following property alerts.template.file=/var/lib/ambari-server/resources/alert-templates-custom.xml. Restart the ambari-server. alert-templates-custom.xml :   <?xml version=”1.0″ encoding=”UTF-8″?> <alert-templates> <alert-template type=”EMAIL”> <subject> <![CDATA[Alert Summary: OK[$summary.getOkCount()], Warning[$summary.getWarningCount()], Critical[$summary.getCriticalCount()], Unknown[$summary.getUnknownCount()]]]> </subject> <body> … Continue reading

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