Metadata in generic refers to data about data and which is kernel of the data processing & storing. With regards to Hadoop ecosystem it could be many things as listed below, Ref: Hadoop Application Architectures – Mark Grover, Ted Malaska, Jonathan Seidman & Gwen Shapira. Thanks much to all Analytics & Big Data community.
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Apache Flink Apache Hadoop Apache Hive Apache Spark Bigdata big data Big Data Analytics Big Data Architecture Big Data Cloud big data project big data rules Bot Chatbots Cloud Cloud Computing Cloudera Cognitive Computing compression Container Container Orchestration datalake data lake Data Streaming DevOps Google Cloud Platform hadoop HDFS Hive Internet of Things IoT Kafka Lambda Architecture mapreduce metadata pig queryengine RDD Scala Secondary Sort spark Spark RDD Splunk SQL Visualization YARN