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  1. hadoop - Populate data from one column to another column on condition in hive

    http://stackoverflow.com/questions/25993571/populate-data-from-one-column-to-another-column-on-condition-in-hive
    up vote 0 down vote favorite WE have :- TABLE_1 having column (A_COL,NUM ) and TABLE_2 having column ( B_COL ,C_COL , NUM) Q condition If A_COL is NULL in the T
  2. mapreduce - How does Hadoop Reducer Work?

    http://stackoverflow.com/questions/32243853/how-does-hadoop-reducer-work
    up vote 0 down vote favorite I was facing a issue with respect to how hadoop invokes its reducer method. Does it create a new instance of the reducer class for
  3. mapreduce - What do we do with the processed data (output) from Hadoop DB?

    http://stackoverflow.com/questions/34426852/what-do-we-do-with-the-processed-data-output-from-hadoop-db
    up vote 0 down vote favorite i am a newbie to Hadoop, hence my apologize if my question is too immature. I understand Hadoop is used for analyzing data on Large
  4. mapreduce - Why Raid is not in the Hadoop 2.x?

    http://stackoverflow.com/questions/20951740/why-raid-is-not-in-the-hadoop-2-x
    up vote 1 down vote favorite 1 In the 0.22.0 version we can find the raid contrib, but it seems that the 2nd generation Hadoop (version 2.x) do not support hdfs
  5. hadoop - Performance issue in hive version 0.13.1

    http://stackoverflow.com/questions/27900760/performance-issue-in-hive-version-0-13-1
    up vote 6 down vote favorite 2 I use AWS-EMR to run my Hive queries and I have a performance issue while running hive version 0.13.1. The newer version of hive
  6. command usage:when to use hadoop fs and hdfs dfs

    http://stackoverflow.com/questions/24386875/command-usagewhen-to-use-hadoop-fs-and-hdfs-dfs
    up vote 1 down vote favorite As the title says, I'm confused when to use commands begining with 'hdfs dfs' and 'hadoop fs' FYI, I'm hadoop newbie using cloudera
  7. mapreduce - Is there any hadoop implement of Louvain method?

    http://stackoverflow.com/questions/12398868/is-there-any-hadoop-implement-of-louvain-method
    up vote 3 down vote favorite 1 This is louvain method to find community in social graph. https://sites.google.com/site/findcommunities/ I want to run it on a bi
  8. mapreduce - How complex can a Hadoop Map Reduce program be?

    http://stackoverflow.com/questions/17778099/how-complex-can-a-hadoop-map-reduce-program-be
    up vote -1 down vote favorite Two basic general questions, I hope you can clarify: Does every program executed via Hadoop has to be written in the Map/Reduce fo
  9. java - execution of Hadoop code without HDFS

    http://stackoverflow.com/questions/23754001/execution-of-hadoop-code-without-hdfs
    up vote 0 down vote favorite I am having an issue running a code accessing hdfs without the command : hadoop jar Here is the code I try to run : package com.in
  10. Hadoop 学习笔记五 ---Hadoop系统通信协议介绍

    http://www.cnblogs.com/geekszhong/p/4483351.html
    2015年05月06日 - 本文约定:  DN: DataNode  TT: TaskTracker  NN: NameNode  SNN: Secondry NameNode  JT: JobTracker  本文介绍Hadoop各节点和Client之间通信协议。  Hadoop的通信是建立在RPC的基础上,关于RPC的详解介绍大家可以参照 "