This sample demonstrates the use of the TIBCO StreamBase® CSV File Reader for Apache HDFS.
The provided StreamBase module reads store sales data from CSV input files and computes total sales for storeID-productID
combinations. The HDFS CSV File Reader adapter instance named
ReadFile1 reads from
file1.csv, which contains sales data for storeA, while
ReadFile2 reads from
file2.csv containing sales data for storeX.
Both files contain records with missing
ReadFile1 is configured to process such records, inserting null values for the unspecified
productID fields. By contrast,
ReadFile2 is configured to discard those records.
When you run the sample, look for output that shows the current total sales for each row read. Since
ReadFile2 is configured to discard incomplete records, no output is emitted for storeX with null
The two files used in this sample,
file2.csv, need to be placed on your HDFS file system before this sample will be able to run.
You must also open the
csvreader-sample.sbapp and select the
Parameters tab and edit the
HDFS_USER values to represent your HDFS setup to be able to access the required files.
In the Package Explorer view, double-click to open the
csvreader-sample.sbappapplication. Make sure the application is the currently active tab in the EventFlow Editor.
Click the Run button. This opens the SB Test/Debug perspective and starts the application.
The two CSV reader adapters start reading from their input files and sending tuples downstream. Look for total sales computed values in the Application Output view, and watch for line rejection warnings from
ReadFile2in the Console view.
When done, press F9 or click the Stop Running Application button.
This section describes how to run the sample in UNIX terminal windows or Windows command prompt windows. On Windows, be sure to use the StreamBase Command Prompt from the Start menu as described in the Test/Debug Guide, not the default command prompt.
Open two terminal windows on UNIX, or two StreamBase Command Prompts on Windows. In each window, navigate to your workspace copy of the sample.
In window 1, start a dequeuer in advance, using the
-woption to specify waiting 10 seconds before attempting its dequeue connection:
sbc -w 10000 deq
In window 2, launch StreamBase Server running
In window 1, observe total sales output tuples computed from the two input files. In window 2, look for line rejection warnings from
To stop the sample, enter Ctrl+C in Window 1 to exit the dequeuer, then enter
In StreamBase Studio, import this sample with the following steps:
From the top menu, select→ .
In the search field, type
csv fileto narrow the list of samples.
Select CSV file input adapter from the StreamBase Standard Adapters category.
StreamBase Studio creates a single project containing the sample files.
When you load the sample into StreamBase Studio, Studio copies the sample project's files to your Studio workspace, which is normally part of your home directory, with full access rights.
Load this sample in StreamBase Studio, and thereafter use the Studio workspace copy of the sample to run and test it, even when running from the command prompt.
Using the workspace copy of the sample avoids permission problems. The default workspace location for this sample is:
See Default Installation Directories for the location of
studio-workspace on your system.
In the default TIBCO StreamBase installation, this sample's files are initially installed in:
See Default Installation Directories for the default location of
studio-workspace on your system.