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Questions tagged [hadoop]

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 highly-availabile service on top of a cluster of computers, each of which may be prone to failures.

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33 views

how to access hadoop slaves which have the same IP address but different port numbers

My question is, I'm wondering if it's possible Hadoop can do ssh access with a different port number(not 22) for slaves when it makes a Hadoop cluster. Detail) I tried to make Hadoop cluster with two ...
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7 views

SolR data location after HDFS indexing

I have a requirement to evaluate a Big Data solution based on SolR but I have some questions unanswered after my search. The solution need to provide access and search capabilities to structural data ...
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34 views

mongo-hadoop connector makes duplicate data by numbers of Mongo Sharding

I'm using mongo-hadoop connector which makes that Hadoop can get data from MongoDB and save into MongoDB. I found MongoDB data is duplicated after Hadoop Map-Reduce job with MongoDB data. environment:...
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184 views

Does HBase support spatial functionality?

I see mention for spatial functional in HBase. For example "HBaseSpatial: A Scalable Spatial Data Storage Based on HBase". What spatial functionality does HBase support and where is this documented?
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1answer
149 views

Directly go to Hadoop or use SQLite/Postgres as a stepping stone towards Hadoop/Spark? [closed]

In our organization, some people are working on setting up Hadoop with a lot of security restrictions etc. By the rate of progress, this seems complex, especially considering security restrictions, ...
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390 views

Apache Phoenix Upsert not working while trying to update null/empty columns

Step 1: Update a column with null value. Upsert into abc.tablename (Rowkeycombo1, Rowkeycombo2, columnname) values (123,to_date('1988-08-06'),null); This works fine and the column then appears to ...
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2answers
1k views

Why is my UTF-8 document raising UTF-8 encoding errors in Azure Data Lake Analytics?

I have a document that was compressed in gunzip from a unknown source system. It was downloaded and decompressed using a 7zip console application. The document is a CSV file that appears to be encoded ...
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1answer
105 views

Suggestions for type of DB to use (Elasticsearch vs MongoDB vs Hadoop)

I am hoping some of you highly skilled DBAs can provide some insight as to the best DB to use for this dataset. This is a relatively simple dataset with no relationship needed between the entries. ...
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2k views

“ZooKeeper exists failed after 4 attempts” when launching Hbase

When launching Hbase I have the following error mike@mike-thinks:~/hbase-1.2.6/bin$ ./hbase shell 2017-11-30 17:26:42,137 WARN [main] util.NativeCodeLoader: Unable to load native-hadoop library for ...
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0answers
107 views

How to installation spark standalone mode in ubuntu

I am trying to install spark standalone but show error. How i can solve this problem. Java version :- 1.8.0_131 Spark:- 2.2.0 Hadoop: 2.7.4 bashrc file setting Hadoop file location in local System: /...
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1answer
62 views

User specific default database in Hive

I am running a Oracle Big Data Appliance platform that has Cloudera EDH 5.9.x running under the hood. My users are mainly using beeswax, which is the Hive query editor app within Hue. When a user ...
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1answer
79 views

Hive metrastore Database in Postgresql External [closed]

We recently migrated hive metastore database from embedded postgresql(coming with cloudera hadoop) to external postgresql(standalone in vm server). After that we notified that there is increase of 5 ...
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1answer
198 views

Apache Phoenix: Using MINUS throws an error

I'm using Apache Phoenix to query Hbase. I tried to use a simple MINUS operator like we do in good old SQL but it produces an error that I couldn't wrap my head around. Here's the query: select * ...
2
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1answer
126 views

Binary storage in Cassandra, HBase

I am looking at some implementations of Cassandra and HBase for medium-sized data sets (~1M resources) to be exposed to clients as graphs (via e.g. Tinkerpop). I would also like to store binaries in ...
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1answer
104 views

Polybase with Cloudera 5.9

We are working on a Proof Of Concept using Polybase with Cloudera. In the polybase documentation it says we can connect to Cloudera 5.5: https://msdn.microsoft.com/en-us/library/mt143174.aspx We ...
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1answer
550 views

How does PolyBase collect statistics from external tables?

Books online has this to say about query optimisation in PolyBase: The query optimizer makes a cost-based decision to push computation to Hadoop when doing so will improve query performance. It ...
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1answer
1k views

PostgreSQL to HDFS to Spark, or PostgreSQL directly to Spark SQL?

If the end goal is to perform computations with Spark, what are the reasons one would first transfer Postgres data to an HDFS (with Sqoop) vs. just using Spark SQL with Postgres directly (with the ...
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1answer
446 views

Can SQL Server 2016 R Services be used to connect to Hadoop data?

I've only been experimenting with SQL Server 2016 recently. So, please correct me if my assumptions are incorrect: From some research on SQL Server R Services, I see that RxHDFSConnect and ...
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1answer
515 views

Slow select from one billion rows GreenPlum DB

I've created the following table on GreenPlum: CREATE TABLE data."CDR" ( mcc text, mnc text, lac text, cell text, from_number text, to_number text, cdr_time timestamp ...
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1answer
46 views

Tools for working with xtrabackup files?

I have database backups in xtrabackup format. I would like to load them into hive without restoring to a mysql instance and use sqoop to then do the transfer. If there are libraries to work with the ...
3
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1answer
857 views

select two tables and print the columns side by side with matching key in hive

I have the below tables: table_1 name_1 id_1 value_1 avi 1 21 adi 2 X table_2 name_2 id_2 value_2 avi 1 21 adi 2 22 metadata_info: can be read from ...
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1answer
122 views

Is it possible to have a SQL Server cluster with Hadoop?

I know how Hadoop works. Is there any possible way to have SQL Server run under Hadoop to build a cluster based on SQL Server and not Drill or Hive. Just a wild question. Any good tutorial/...
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1answer
143 views

How to add complex calculations to Elastic Search

I'm using elastic search to index large amounts of sensor data for analytics purposes. The table has 4 million + rows and growing fast - expecting 40 million within the next year. This makes Elastic ...
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1answer
191 views

Fastest way to sync (or keep import) 3.5TB data from hadoop to sharded mongodb cluster

There are 3.5TB data in our hadoop cluster(yes on hdfs). And we have newly built a sharded mongodb cluster(the latest 3.x) with 3 mongos, 3 configdb and 3 shards(each shard has 1 primary and 2 ...
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138 views

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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1answer
403 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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209 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
444 views

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

What is the difference between Hadoop, MongoDB, Big data ?
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319 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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229 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, ...
2
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1answer
4k 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
3k 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
845 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
247 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
2k 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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614 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
356 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
339 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 ...
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1answer
633 views

Books to start with big data [closed]

I would like to start learning about the big data technologies. I work in this area in the future. Does anyone know good books to start learning about it? Hadoop, HBase. Beginner - intermediate - ...