-
This is a cookbook for scala programming. 1. Define a object with main function -- Helloworld. object HelloWorld { def main(args: Array...
-
Hive table contains files in HDFS, if one table or one partition has too many small files, the HiveQL performance may be impacted. Sometime...
-
Hive is trying to embrace CBO(cost based optimizer) in latest versions, and Join is one major part of it. Understanding join best practices ...
-
Many commands can check the memory utilization of JAVA processes, for example, pmap, ps, jmap, jstat. What are the differences? Before we ...
-
This article shows a sample code to load data into Hbase or MapRDB(M7) using Scala on Spark. I will introduce 2 ways, one is normal load us...
-
Goal: How to build and use parquet-tools to read parquet files. Solution: 1. Download and Install maven. Follow below link: http://...
-
Goal: This article explains what is the difference between Spark HiveContext and SQLContext.
-
Goal: This article explains the configuration parameters for Oozie Launcher job.
-
Goal: This article provides the SQL to list table or partition locations from Hive Metastore. Env: Hive metastore 0.13 on MySQL Root ...
-
Goal: How to understand PageRank algorithm in scala on Spark. This article explains each step using sample data.
