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Scala Overview Scala is object-oriented Scala is a pure object-oriented language in the sense that every value is an object. Types and behavior of obj 阅读全文
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Parquet Parquet is a columnar storage format for Hadoop. Parquet is designed to make the advantages of compressed, efficient colunmar data representat 阅读全文
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Overview Apache Impala (incubating) is the open source, native analytic database for apache Hadoop. Features Do BI-style Queries on Hadoop: low latenc 阅读全文
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Why Dr.Elephant? Most of Hadoop optimization tools out there, but they are focused on simplifying the deploy and managment of Hadoop clusters. Very fe 阅读全文
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Overview Background: I start a thread [call thread A below]in Spark driver to handle opening files in codis, in which I start six thread [call sub thr 阅读全文