Top "Hadoop2" questions

How does Hadoop Namenode failover process works?

Hadoop defintive guide says - Each Namenode runs a lightweight failover controller process whose job it is to monitor its …

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What is the replacement of NULLIF in Hive?

I would like to know what is the replacement of NULLIF in Hive? I am using COALESCE but its not …

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org.apache.spark.rpc.RpcTimeoutException: Futures timed out after [120 seconds]. This timeout is controlled by spark.rpc.lookupTimeout

Getting the below error with respect to the container while submitting an spark application to YARN. The HADOOP(2.7.3)/SPARK (2.1) environment …

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What is --direct mode in sqoop?

As per my understanding sqoop is used to import or export table/data from the Database to HDFS or Hive …

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How to fix Hadoop WARNING: An illegal reflective access operation has occurred error on Ubuntu

I have installed Java openjdk version "10.0.2"and Hadoop 2.9.0 successfully. All processes are running well hadoopusr@amalendu:~$ jps 19888 NameNode 20388 DataNode 20898 NodeManager 20343 …

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Number of reducers in hadoop

I was learning hadoop, I found number of reducers very confusing : 1) Number of reducers is same as number of partitions. 2) …

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Hadoop namenode : Single point of failure

The Namenode in the Hadoop architecture is a single point of failure. How do people who have large Hadoop clusters …

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pom.xml for Hadoop 2.6.0

I am trying to implement an app => find maximum temperature from weather data (exepmle from Tom White’s book …

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How to start hiveserver2 as service

Hi all I have setup multi node cluster (i.e 5 node) in my network which working fine. now I wanted …

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copyFromLocal: unexpected URISyntaxException

I am trying to copy some files from my hard drive to HDFS , I am using this command hadoop fs …

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