Apache Hadoop is a framework that allows for the distributed processing of large data sets across clusters of computers. It is designed to scale up from single servers to thousands of machines. The library itself is designed to detect and handle failures at the application layer, so delivering a ...

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Options for copying data out of continuously updating tables

I work with a pretty large (O(10^1) TB) DB2 (LUW, v. 9.7) database. It's got data coming in on a continuous basis via Golden Gate replication from another DB2 database. It's used for business ...
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16 views

Can we swap out SQL Server with HBase on our .Net application?

In a current application we use SQL Server. The data flow consists of using TVPs for better-than-bulk-insert performance by passing in DataTables. As part of the data addition process, old records ...
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1answer
15 views

Postgres or MapReduce to Match Reciprocal Needle Pairs from a Stack of Needles?

I have a Postgres (latest version) table with about a million lines (a_lat, a_lon, b_lat, b_lon) that each have about a dozen criteria. These lines go together in reciprocal pairs (A - B, B - A), ...
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32 views

Exporting an HBase table which is larger than the available HDFS space?

I have a 1TB hbase table which I need to export. Unfortunately I only have 600GB free in HDFS, so I was hoping to export it to a mounted file share. I've learned that the hbase export can only export ...
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1answer
50 views

What is the difference between hadoop, mongoDB, Big data? [closed]

What is the difference between Hadoop, MongoDB, Big data ?
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62 views

Can we query Accumulo data from Apache Drill

Accumulo uses HDFS where as HBase also works on top of HDFS. We can query HBase data through Drill. So can we query Accumulo data also from Apache Drill ?
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100 views

Alternatives for storing 365TB of info

I need to upload daily CSV dumps to a blackbox of my choice, and it should be possible to run queries or create filters over the uploaded data. Daily dumps weight around 1TB and are basically id, ...
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22 views

Should I install hadoop on a single node

I just bought a desktop computer with 16GB RAM and 1TB drive, i7-quad core. I will be partitioning off 800GB for Ubuntu so I can do some data science type tasks. Is there any advantage to installing ...
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1answer
2k views

Small startup: Cassandra + Hadoop or ElasticSearch

To give some context, I am from a small start up (4 team members) and we work in the education space. We've developed an e-learning platform that several schools are already using. We currently have ...
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1answer
749 views

Problem while connecting to teradata with sqoop

I am trying to connect to Teradat using Sqoop with following command: sqoop import -libjars /usr/lib/sqoop/lib/tdgssconfig.jar,/usr/lib/sqoop/lib/terajdbc4.jar -driver com.teradata.jdbc.TeraDriver ...
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1answer
505 views

MySQL Rows to Columns to HBase (using Sqoop)

I have a table that looks like this in MySQL: id | date | num | avg I have found that I can use this for rows to columns and it works so far: SELECT CONCAT(id, '-', date), MAX(IF(`num` = ...
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1answer
109 views

Cassandra with Hadoop

Cassandra uses Cassandra File System (CFS) and Hadoop uses Hadoop Distributed File System (HDFS) I'm already using Pig over HDFS and i would like to install Cassandra. Having additional servers for ...
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1answer
299 views

How often does the Impala StateStore refresh?

I am using Hive and Impala on the same cluster. I find that when I create new tables, the Impala StateStore does not refresh automatically even after a few hours. I know that I can accomplish this by ...
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351 views

Enabling JMX For Hadoop HDFS & Also MapReduce

I'm having a hard time figuring out how to enable JMX to submit metrics for HDFS and MapReduce jobs in Hadoop (CDH4). I've seen several links and read through 'The Definitive Guide' and 'Hadoop ...
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1answer
271 views

Storing 5TB web server access log vs OLAP DB

We have over 5TB compressed web server log in a HDFS and we often analyse using Hadoop. It is painful to run map reduce on 5TB of data and most importantly, not many developer are familiar with it. ...
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1answer
248 views

MapReduce performance on a single PC [closed]

I have heard that Hadoop has better performance than MySQL. Until now, I have used relational databases so this is really new technology for me. I have a 6 core PC. Suppose I have a table with 20 ...