Most answered questions in Big Data Hadoop

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Where can I find logs in Spark on YARN?

You can access logs through the command yarn ...READ MORE

Nov 8, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 873 views
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1 answer

Hadoop: “Unhealthy Node local-dirs and log-dirs are bad”

You can increase the threshold in yarn-site.xml <property> ...READ MORE

Nov 8, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 3,875 views
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1 answer

What does a Hadoop tester do?

Hadoop tester, like any other tester, has ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 396 views
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1 answer

Is Linux Skills mandatory to become Hadoop developer?

Hello. Knowing basics of Linux is mandatory ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 884 views
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Hadoop: java.io.IOException: File could only be replicated to 0 nodes instead of minReplication (=1)

Try this, first stop all the daemons, ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 3,246 views
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1 answer

Hadoop Hive: How to split string in Hive?

You can use the split function along ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 11,374 views
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1 answer

How to save Spark dataframe as dynamic partitioned table in Hive?

Hey, you can try something like this: df.write.partitionBy('year', ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 8,236 views
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1 answer

Hadoop: localhost: Error: JAVA_HOME is not set.

Seems like PATH problem in hadoop-env.sh file. Try ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 4,797 views
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1 answer

Hadoop: What is the difference between `hadoop dfs` and `hadoop fs`?

You can find the definition here: $HADOOP_HOME/bin/hadoop ... elif [ ...READ MORE

Nov 6, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,592 views
+1 vote
1 answer

Hive: How to use insert query like SQL

It is now possible to insert like ...READ MORE

Nov 5, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 627 views
0 votes
1 answer

Hadoop: Datanode not starting correctly

You can do the following method, copy to ...READ MORE

Nov 5, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 2,362 views
0 votes
1 answer

What is Streaming data and Hadoop?

The hack you describe is more or ...READ MORE

Nov 2, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,598 views
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What does AM in “AM Container” mean in Hadoop

Here's another link from Hadoop which may ...READ MORE

Nov 2, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,203 views
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1 answer

Hadoop: How to keep duplicates in Hive using collect_set()?

SELECT hash_id, COLLECT_LIST(num_of_cats) AS ...READ MORE

Nov 2, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 2,107 views
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Hadoop: `.' no such file or directory while installing

Try hadoop fs -mkdir -p /user/[Username] and then run ...READ MORE

Nov 2, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,368 views
+2 votes
1 answer

Hadoop Jersey 1.x injection which is now not supported by Weblogic 12C

Add these lines to your weblogic-application.xml file ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,155 views
0 votes
1 answer

How to convert a string to timestamp with milliseconds in Hive?

 concatenation of substrings using the following code: select ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 18,829 views
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1 answer

Job and Task Scheduling In Hadoop

I  n case of fair scheduler, when there is ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 1,658 views
0 votes
1 answer

Hadoop: How to Group mongodb - mapReduce output?

db.order.mapReduce(function() { emit (this.customer,{count:1,orderDate:this.orderDate.interval_start}) }, function(key,values){ var category; ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 704 views
+1 vote
1 answer

What is the technique to know the Default scheduler in hadoop?

Default scheduler in hadoop is JobQueueTaskScheduler, which is ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,446 views
+1 vote
1 answer

What is difference between Hadoop Namenode HA and HDFS federation?

The main difference between HDFS High Availability ...READ MORE

Oct 31, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,096 views
0 votes
1 answer

Hadoop Mapreduce: Error: Could not find or load main class com.sun.tools.javac.Main

You have to add HADOOP_CLASSPATH environment parameter: expor ...READ MORE

Oct 30, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 3,313 views
0 votes
1 answer

How to delete hdfs folder from java app?

Try this: Configuration conf = new Configuration(); ...READ MORE

Oct 30, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,919 views
0 votes
1 answer

Hadoop Mapreduce: Class Not Found Exception

Try adding this Job job = new Job(conf, ...READ MORE

Oct 29, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 3,605 views
0 votes
1 answer

Opening a HDFS file in browser

In HDFS 8020 is IPC port, you ...READ MORE

Oct 29, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 9,394 views
0 votes
1 answer

How to uninstall all versions of hadoop completely from the system?

Do a: sudo dpkg -l | grep hadoop to ...READ MORE

Oct 29, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 10,185 views
0 votes
1 answer

Understanding LongWritable

Hadoop needs to be able to serialise ...READ MORE

Oct 29, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,209 views
0 votes
1 answer

How do I compile my java program on Ubuntu such that it will refer to hadoop-2.2.0 libraries?

The simplest solution for Linux machines would ...READ MORE

Oct 29, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 928 views
0 votes
1 answer

Hadoop: No Such Method Exception

Mapper and reducer classes need to be ...READ MORE

Oct 26, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 1,671 views
0 votes
1 answer

How to fix corrupt HDFS FIles?

You can use hdfs fsck / to ...READ MORE

Oct 25, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,898 views
0 votes
1 answer

Where is hadoop-test.jar in Hadoop2?

In Hadoop 1, testmapredsort is launched from AllTestDriver.java, which was ...READ MORE

Oct 24, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 917 views
0 votes
1 answer

What is Hadoop Performance Tuning?

Is it consistent or one-off reading? Is ...READ MORE

Oct 24, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 779 views
0 votes
1 answer

Google Hadoop Filesystem Encryption

If you're asking if customer-supplied encryption keys ...READ MORE

Oct 18, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 531 views
0 votes
1 answer

Is Java alone Sufficient for Hadoop?

In my day job, I've just spent ...READ MORE

Oct 18, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 460 views
0 votes
1 answer

What is -cp command in hadoop? How it works?

/user/cloudera/data1 is not a directory, it is ...READ MORE

Oct 17, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 3,885 views
0 votes
1 answer

What is a data serialization system?

So when Hadoop was being written by ...READ MORE

Oct 17, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,061 views
0 votes
1 answer

What is the best way to integrate SAS with Hadoop without losing the parallel processing capacity of Hadoop

One of the major pushes at SAS ...READ MORE

Oct 16, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,996 views
0 votes
1 answer

How to configure Yarn from command line?

It's a bit non-intuitive, but it turns ...READ MORE

Oct 16, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,683 views
0 votes
1 answer

Does Hadoop and Spark support iPv6 now?

It does not. As of today HADOOP-11890, which ...READ MORE

Oct 15, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,787 views
0 votes
1 answer

Hadoop Cluster Node Setup.

Yes, at least in small clusters those ...READ MORE

Oct 15, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 460 views
+1 vote
1 answer

How to count number of rows in alias in PIG?

COUNT is part of pig LOGS= LOAD 'log'; LOGS_GROUP= ...READ MORE

Oct 15, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 2,467 views
0 votes
1 answer

What are the prerequisites to learn Hadoop in java perspective?

In my day job, I've just spent ...READ MORE

Oct 11, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 631 views
0 votes
1 answer

POC for Hadoop in real time scenario

I'd like to point a few things. If ...READ MORE

Oct 11, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,476 views
0 votes
1 answer

PIG - Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected

Yes, it is a compatibility issue. in Hadoop ...READ MORE

Oct 10, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 945 views
0 votes
1 answer

Setting textinputformat.record.delimiter in spark

I got this working with plain uncompressed ...READ MORE

Oct 10, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 2,189 views
0 votes
1 answer

Is it possible to integrate Kdb+ and hadoop?

kdb is a column oriented database plus ...READ MORE

Oct 10, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 798 views
0 votes
1 answer

Is MapR a substitute for MapReduce?

MapR is a commercial distribution of Apache ...READ MORE

Oct 10, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,008 views
0 votes
1 answer

Is it possible to start a zookeeper server instance in process?

To start ZooKeeper you have to execute ZooKeeperServerMain class. You can use ...READ MORE

Oct 9, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 527 views
0 votes
1 answer

How to Access Hive via Python?

The easiest way is to use PyHive. To ...READ MORE

Oct 9, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 16,614 views
0 votes
1 answer

Hadoop on OSX “Unable to load realm info from SCDynamicStore”

Add the following to your hadoop-env.sh file: export ...READ MORE

Oct 8, 2018 in Big Data Hadoop by Omkar
 • 69,230 points • 537 views
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