Trending questions in Big Data Hadoop

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How will you choose various file formats for storing and processing data using Apache Hadoop ?

The decision to choose a particular file ...READ MORE

Sep 27, 2018 in Big Data Hadoop by zombie
 • 3,790 points • 1,567 views
0 votes
1 answer

Understanding Hadoop Master Node, Slave Node and Data Node.

The NameNode and the JobTracker are single ...READ MORE

Sep 6, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,483 views
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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 • 969 views
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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
 • 69,210 points • 931 views
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1 answer

How to run Map Reduce program using Ubuntu terminal?

 I used the following steps to execute it ...READ MORE

Aug 7, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 3,657 views
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1 answer

How to find Hadoop version in CDH?

The simplest way to check Hadoop version ...READ MORE

Apr 19, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 8,399 views
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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 • 521 views
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2 answers

Hadoop query regarding setJarByClass method of Job class

http://www.bigdataspeak.com/2014/06/what-is-need-to-use-jobsetjarbycla ...READ MORE

Feb 7, 2019 in Big Data Hadoop by siri
 • 2,047 views
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1 answer

Integration of Hadoop with Mongo DB concept

MongoDB isn't built to work on top ...READ MORE

Sep 25, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,491 views
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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 • 455 views
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1 answer

How to create smaller table from big table in HIVE?

You could probably best use Hive's built-in sampling ...READ MORE

Sep 24, 2018 in Big Data Hadoop by digger
 • 26,740 points • 1,483 views
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1 answer

How to format the output being written by MapReduce in Hadoop?

Here is a simple code demonstrate the ...READ MORE

Sep 5, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,289 views
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1 answer

Is there a way to copy data from one one Hadoop distributed file system(HDFS) to another HDFS?

The distributed copy command, distcp, is a ...READ MORE

Mar 22, 2018 in Big Data Hadoop by Ashish
 • 2,650 points • 9,503 views
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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 • 784 views
+5 votes
2 answers

Hive to HDFS transfer

Hive does not store data. Hive is ...READ MORE

Sep 20, 2018 in Big Data Hadoop by SM
 • 3,665 views
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How to discover missing or corrupt HDFS data?

HDFS supports fsck command to check for ...READ MORE

Sep 19, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 1,609 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 • 444 views
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1 answer

What is Modeling data in Hadoop and how to do it?

I suggest spending some time with Apache ...READ MORE

Sep 19, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,577 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 • 613 views
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1 answer

When I try to connect to Hadoop, I get a error as -"Connecting to Resource Manager failed".

Make sure you've started Yarn. Use this ...READ MORE

Sep 28, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,162 views
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1 answer

What is Hadoop Speculative task execution?

One problem with the Hadoop system is ...READ MORE

Oct 3, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 890 views
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1 answer

How to pass large records to map/reduce tasks?

Hadoop is not designed for records about ...READ MORE

Sep 25, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,225 views
+3 votes
1 answer

Getting Connection Error while loading data into table using cloudera hive

Hey Nafeesa, Itseems that Hive is not able ...READ MORE

Oct 4, 2018 in Big Data Hadoop by Vardhan
 • 13,190 points • 730 views
0 votes
1 answer

Getting error in Hadoop: Output file already exist

When you executed your code earlier, you ...READ MORE

Apr 19, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 8,073 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
 • 69,210 points • 509 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
 • 69,210 points • 520 views
0 votes
1 answer

What is Custom partitioner in Hadoop? How to write partition function ?

Don't think that in Hadoop the same ...READ MORE

Sep 18, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,380 views
0 votes
1 answer

GROUP and COGROUP in PIG

Both GROUP and COGROUP operators are identical ...READ MORE

Jul 25, 2018 in Big Data Hadoop by shams
 • 3,670 points • 3,732 views
0 votes
1 answer

Which is the most preferable language for Hadooop Map-Reduce programs?

MapReduce is a programming model to perform ...READ MORE

Aug 4, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 3,309 views
0 votes
1 answer

What should be the choice of database and what type of data format is suitable for Spark/hadoop?

Use Parquet. I'm not sure about CSV ...READ MORE

Sep 28, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 783 views
+1 vote
2 answers

Execute Pig Script from Grunt Shell

From your current directory run  pig -x local Then ...READ MORE

Oct 25, 2018 in Big Data Hadoop by Kunal
 • 5,719 views
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1 answer

What is the command to check the number of cores in Spark?

Go to your Spark Web UI & ...READ MORE

May 17, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 6,518 views
0 votes
1 answer

How do I print hadoop properties in command line?

You can dump Hadoop config by running: $ ...READ MORE

Aug 23, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 2,261 views
0 votes
1 answer

What is Dumbo MapReduce in Hadoop?

Doc on Hadoop Streaming : http://hadoop.apache.org/docs/r1.2.1/streaming.html Hadoop streaming is ...READ MORE

Sep 23, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 838 views
0 votes
1 answer

Is Hadoop a good open-source project to join?

Yes, Hadoop has a whole ecosystem of ...READ MORE

Sep 27, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 664 views
0 votes
1 answer

Does map/reduce merge output files after reduce phase?

Hey there, instead of doing the file ...READ MORE

Sep 25, 2018 in Big Data Hadoop by digger
 • 26,740 points • 701 views
+1 vote
1 answer

Where to set hadoop.tmp.dir? core-site.xml or hdfs-site.xml?

hadoop.tmp.dir (A base for other temporary directories) is ...READ MORE

Mar 26, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 8,536 views
0 votes
1 answer

Will hadoop(sqoop) load oracle faster than SQL loader?

down vote Had a similar task of exporting ...READ MORE

Sep 4, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,579 views
0 votes
1 answer

Using Hadoop for Data Analytics.

Yes, your approach is correct - you ...READ MORE

Sep 28, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 528 views
0 votes
1 answer

Kafka vs Flume

Even though both are used for real-time ...READ MORE

Sep 24, 2018 in Big Data Hadoop by Data_Nerd
 • 2,390 points • 691 views
0 votes
1 answer

How to avoid a “split-brain” scenario with NameNodes?

Okay, so let me tell you that ...READ MORE

Jul 11, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 3,940 views
0 votes
1 answer

What is the difference between Hadoop MapReduce and built-in MapReduce?

Differences are as follows: Hadoop's MR can be ...READ MORE

Sep 11, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 1,227 views
0 votes
1 answer

can't find start-all.sh in hadoop installation

Actually, you are not mentioning the path for ...READ MORE

Apr 17, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 7,558 views
0 votes
1 answer

How to install Sqoop with Hadoop 2.2.0?

You can refer the below link to ...READ MORE

Sep 18, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 872 views
0 votes
1 answer

Where can I find older versions of Hadoop?

You can check here. From the archives. In particular, ...READ MORE

Sep 27, 2018 in Big Data Hadoop by Frankie
 • 9,830 points • 498 views
0 votes
1 answer

How hadoop command works with javac?

Javac is used for compiling your java ...READ MORE

Aug 17, 2018 in Big Data Hadoop by Neha
 • 6,300 points • 2,227 views
0 votes
1 answer

After installing Hadoop on Windows7, NameNode failed to start

You need to install Hadoop winutils to ...READ MORE

May 3, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 6,747 views
0 votes
1 answer

What additional capability does Ganglia provide to monitor Hadoop?

Ganglia is an open-source, scalable and distributed ...READ MORE

Sep 18, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 764 views
0 votes
1 answer

How does the HDFS architecture provide redundancy?

Hadoop provides redundancy by storing multiple replicas ...READ MORE

Sep 19, 2018 in Big Data Hadoop by nitinrawat895
 • 11,380 points • 720 views
0 votes
1 answer

Hadoop absolute path - pwd ?

"hdfs dfs -pwd" does not exist because ...READ MORE

Mar 27, 2018 in Big Data Hadoop by kurt_cobain
 • 9,390 points • 8,309 views
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