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Under what two conditions does stochastic gradient descent outperform 2nd-order optimization techniques such as iteratively reweighted least squares?

A. When the volume of input data is so large and diverse that a 2nd-order optimization technique can be fit to a sample of the data

B. When the model's estimates must be updated in real-time in order to account for new observations.

C. When the input data can easily fit into memory on a single machine, but we want to calculate confidence intervals for all of the parameters in the model.

D. When we are required to find the parameters that return the optimal value of the objective function.

What is the result of the following command (the database username is foo and password is bar)?

$ sqoop list-tables - - connect jdbc : mysql : / / localhost/databasename - - table - - username foo - - password bar

A. sqoop lists only those tables in the specified MySql database that have not already been imported into FDFS

B. sqoop returns an error

C. sqoop lists the available tables from the database

D. sqoop imports all the tables from SQL HDFS

In what format are web server log files usually generated and how must you transform them in order to make them usable for analysis in Hadoop?

A. XML files that you need to convert to JSON

B. Text files that require parsing into useful fields

C. CSV files that require parsing into useful fields

D. HTML files that you need to convert to plain text or CSV

E. Binary files that may require decompression and conversion using AVRO

You have acquired a new data source of millions of customer records, and you've this data into HDFS. Prior to analysis, you want to change all customer registration to the same date format, make all addresses uppercase, and remove all customer names (for anonymization). Which process will accomplish all three objectives?

A. Adapt the data cleansing module in Mahout to your data, and invoke the Mahout library when you run your analysis

B. Pull this data into an RDBMS using sqoop and scrub records using stored procedures

C. Write a script that receives records on stdin, corrects them, and then writes them to stdout. Then, invoke this script in a map-only Hadoop Streaming Job

D. Write a MapReduce job with a mapper to change words to uppercase and to reduce different forms of dates to a single form

You want to understand more about how users browse your public website. For example, you war know which pages they visit prior to placing an order. You have a server farm of 200 web server hosting your website. Which is the most efficient process to gather these web servers access logs into your Hadoop cluster for analysis?

A. Sample the web server logs web servers and copy them into HDFS using curl

B. Channel these click streams into Hadoop using Hadoop Streaming

C. Write a MapReduce job with the web servers for mappers and the Hadoop cluster nodes for reducers

D. Import all user clicks from your OLTP databases Into Hadoop using Sqoop

E. Ingest the server web logs into HDFS using Flume