Author: ravimagham
Date: Sat Dec 27 23:30:11 2014
New Revision: 1648128
URL: http://svn.apache.org/r1648128
Log:
phoenix_mr_1.changes
Added:
phoenix/site/publish/phoenix_mr.html
Added: phoenix/site/publish/phoenix_mr.html
URL:
http://svn.apache.org/viewvc/phoenix/site/publish/phoenix_mr.html?rev=1648128&view=auto
==============================================================================
--- phoenix/site/publish/phoenix_mr.html (added)
+++ phoenix/site/publish/phoenix_mr.html Sat Dec 27 23:30:11 2014
@@ -0,0 +1,487 @@
+
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+ <div class="page-header">
+ <h2 id="Phoenix_Map_Reduce">Phoenix Map Reduce</h2>
+ </div>
+ <p>Phoenix provides support for retrieving and writing to Phoenix tables from
within MapReduce jobs. The framework now provides custom <a
class="externalLink"
href="http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/InputFormat.html";>InputFormat</a>
and <a class="externalLink"
href="http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/OutputFormat.html";>OutputFormat</a>
classes <a class="externalLink"
href="https://github.com/apache/phoenix/blob/f84e5da33c21a728e73924c07506dd63e4621872/phoenix-core/src/main/java/org/apache/phoenix/mapreduce/PhoenixInputFormat.java";>PhoenixInputFormat</a>
, <a class="externalLink"
href="https://github.com/apache/phoenix/blob/f84e5da33c21a728e73924c07506dd63e4621872/phoenix-core/src/main/java/org/apache/phoenix/mapreduce/PhoenixOutputFormat.java";>PhoenixOutputFormat</a>.
</p>
+ <p><a class="externalLink"
href="https://github.com/apache/phoenix/blob/f84e5da33c21a728e73924c07506dd63e4621872/phoenix-core/src/main/java/org/apache/phoenix/mapreduce/util/PhoenixMapReduceUtil.java";
title="PhoenixMapReduceUtil">PhoenixMapReduceUtil</a> provides several utility
methods to set the input and output configuration parameters to the job.</p>
+ <p>When a Phoenix table is the source for the Map Reduce job, we can provide
a SELECT query or pass a table name and specific columns to import data . To
retrieve data from the table within the mapper class, we need to have a class
that implements <a class="externalLink"
href="http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapred/lib/db/DBWritable.html";
title="DBWritable">DBWritable</a> and pass it as an argument to
PhoenixMapReduceUtil.<b>setInput</b> method. The custom DBWritable class
provides implementation for <a class="externalLink"
href="http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/lib/db/DBWritable.html#readFields%28java.sql.ResultSet%29";
title="readFields">readFields(ResultSet rs)</a> that allows us to retrieve
columns for each row. This custom DBWritable class will form the input value to
the mapper class. </p>
+ <blockquote>
+ <p>Note: The SELECT query must not perform any aggregation or use DISTINCT
as these are not supported by our map-reduce integration.</p>
+ </blockquote>
+ <p>Similarly, when writing to a Phoenix table, we use the
PhoenixMapReduceUtil.<b>setOutput</b> method to set the output table and the
columns. </p>
+ <blockquote>
+ <p>Note: Phoenix internally builds the UPSERT query for you . </p>
+ </blockquote>
+ <p>The output key and value class for the job should always be NullWritable
and the custom DBWritable class that implements the <a class="externalLink"
href="http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/lib/db/DBWritable.html#write%28java.sql.PreparedStatement%29";
title="write">write</a> method . </p>
+ <p>Letâs dive into an example where we have a table, <b>STOCK</b> , that
holds the master data of quarterly recordings in a double array for each year
and we would like to find out the max price of each stock across all years.
Letâs store the output to a <b>STOCK_STATS</b> table which is another Phoenix
table. </p>
+ <blockquote>
+ <p>Note , you can definitely have a job configured to read from hdfs and
load into a phoenix table. </p>
+ </blockquote>
+ <p>a) <i>stock</i> </p>
+ <div class="source">
+ <pre> CREATE TABLE IF NOT EXISTS STOCK (STOCK_NAME VARCHAR NOT NULL
,RECORDING_YEAR INTEGER NOT NULL, RECORDINGS_QUARTER DOUBLE array[] CONSTRAINT
pk PRIMARY KEY (STOCK_NAME , RECORDING_YEAR));
+</pre>
+ </div>
+ <p>b) <i>stock_stats</i> </p>
+ <div class="source">
+ <pre>CREATE TABLE IF NOT EXISTS STOCK_STATS (STOCK_NAME VARCHAR NOT NULL ,
MAX_RECORDING DOUBLE CONSTRAINT pk PRIMARY KEY (STOCK_NAME));
+</pre>
+ </div>
+ <p><i>Sample Data</i></p>
+ <div class="source">
+ <pre> UPSERT into STOCK values ('AAPL',2009,ARRAY[85.88,91.04,88.5,90.3]);
+ UPSERT into STOCK values ('AAPL',2008,ARRAY[199.27,200.26,192.55,194.84]);
+ UPSERT into STOCK values ('AAPL',2007,ARRAY[86.29,86.58,81.90,83.80]);
+ UPSERT into STOCK values ('CSCO',2009,ARRAY[16.41,17.00,16.25,16.96]);
+ UPSERT into STOCK values ('CSCO',2008,ARRAY[27.00,27.30,26.21,26.54]);
+ UPSERT into STOCK values ('CSCO',2007,ARRAY[27.46,27.98,27.33,27.73]);
+ UPSERT into STOCK values ('CSCO',2006,ARRAY[17.21,17.49,17.18,17.45]);
+ UPSERT into STOCK values ('GOOG',2009,ARRAY[308.60,321.82,305.50,321.32]);
+ UPSERT into STOCK values ('GOOG',2008,ARRAY[692.87,697.37,677.73,685.19]);
+ UPSERT into STOCK values ('GOOG',2007,ARRAY[466.00,476.66,461.11,467.59]);
+ UPSERT into STOCK values ('GOOG',2006,ARRAY[422.52,435.67,418.22,435.23]);
+ UPSERT into STOCK values ('MSFT',2009,ARRAY[19.53,20.40,19.37,20.33]);
+ UPSERT into STOCK values ('MSFT',2008,ARRAY[35.79,35.96,35.00,35.22]);
+ UPSERT into STOCK values ('MSFT',2007,ARRAY[29.91,30.25,29.40,29.86]);
+ UPSERT into STOCK values ('MSFT',2006,ARRAY[26.25,27.00,26.10,26.84]);
+ UPSERT into STOCK values ('YHOO',2009,ARRAY[12.17,12.85,12.12,12.85]);
+ UPSERT into STOCK values ('YHOO',2008,ARRAY[23.80,24.15,23.60,23.72]);
+ UPSERT into STOCK values ('YHOO',2007,ARRAY[25.85,26.26,25.26,25.61]);
+ UPSERT into STOCK values ('YHOO',2006,ARRAY[39.69,41.22,38.79,40.91]);
+</pre>
+ </div>
+ <div class="section">
+ <h3 id="Below_is_a_simple_job_configuration">Below is a simple job
configuration</h3>
+ <p><b><i>Job Configuration</i></b></p>
+ <div class="source">
+ <pre> final Configuration configuration = HBaseConfiguration.create();
+
+ final Job job = Job.getInstance(configuration, "phoenix-mr-job");
+
+ // We can either specify a selectQuery or ignore it when we would like to
retrieve all columns from the table.
+ final String selectQuery = "SELECT
STOCK_NAME,RECORDING_YEAR,RECORDINGS_QUARTER FROM STOCK ";
+
+ // StockWritable is the DBWritable class that enables us to process the
Result of the above query.
+</pre>
+ </div>
+ <p> PhoenixMapReduceUtil.setInput(job, StockWritable.class, âSTOCKâ,
selectQuery); </p>
+ <p> // Set the target Phoenix table and the columns.
PhoenixMapReduceUtil.setOutput(job, âSTOCK_STATSâ,
âSTOCK_NAME,MAX_RECORDINGâ);</p>
+ <p> // The input key should always be NullWritable and the value is the
custom DBWritable class . job.setMapperClass(StockMapper.class);
job.setReducerClass(StockReducer.class);
job.setOutputFormatClass(PhoenixOutputFormat.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(DoubleWritable.class);
job.setOutputKeyClass(NullWritable.class);
job.setOutputValueClass(StockWritable.class); </p>
+ <p> TableMapReduceUtil.addDependencyJars(job);
job.waitForCompletion(true);</p>
+ <p><b><i>StockWritable</i></b></p>
+ <div class="source">
+ <pre>public class StockWritable implements DBWritable,Writable {
+
+ private String stockName;
+
+ private int year;
+
+ private double[] recordings;
+
+ private double maxPrice;
+
+ @Override
+ public void readFields(DataInput input) throws IOException {
+
+ }
+
+ @Override
+ public void write(DataOutput output) throws IOException {
+
+ }
+
+ @Override
+ public void readFields(ResultSet rs) throws SQLException {
+ stockName = rs.getString("STOCK_NAME");
+ year = rs.getInt("RECORDING_YEAR");
+ final Array recordingsArray =
rs.getArray("RECORDINGS_QUARTER");
+ recordings = (double[])recordingsArray.getArray();
+ }
+
+ @Override
+ public void write(PreparedStatement pstmt) throws SQLException {
+ pstmt.setString(1, stockName);
+ pstmt.setDouble(2, maxPrice);
+ }
+
+ // getters / setters for the fields
+ ...
+ ...
+</pre>
+ </div>
+ <p><b><i>Stock Mapper</i></b></p>
+ <div class="source">
+ <pre> public static class StockMapper extends Mapper<NullWritable,
StockWritable, Text , DoubleWritable> {
+
+ private Text stock = new Text();
+ private DoubleWritable price = new DoubleWritable ();
+
+ @Override
+ protected void map(NullWritable key, StockWritable stockWritable, Context
context) throws IOException, InterruptedException {
+ double[] recordings = stockWritable.getRecordings();
+ final String stockName = stockWritable.getStockName();
+ double maxPrice = Double.MIN_VALUE;
+</pre>
+ </div>
+ <p> for(double recording : recordings) { if(maxPrice < recording) {
maxPrice = recording; } } stock.set(stockName); price.set(maxPrice);
context.write(stock,price); }</p>
+ <div class="source">
+ <pre>}
+</pre>
+ </div>
+ <p><b><i>Stock Reducer</i></b></p>
+ <div class="source">
+ <pre> public static class StockReducer extends Reducer<Text,
DoubleWritable, NullWritable , StockWritable> {
+
+ @Override
+ protected void reduce(Text key, Iterable<DoubleWritable> recordings,
Context context) throws IOException, InterruptedException {
+ double maxPrice = Double.MIN_VALUE;
+ for(DoubleWritable recording : recordings) {
+ if(maxPrice < recording.get()) {
+ maxPrice = recording.get();
+ }
+ }
+ final StockWritable stock = new StockWritable();
+ stock.setStockName(key.toString());
+ stock.setMaxPrice(maxPrice);
+ context.write(NullWritable.get(),stock);
+ }
+
+}
+</pre>
+ </div>
+ <p><b><i>Packaging & Running</i></b></p>
+ <ol style="list-style-type: decimal">
+ <li>Ensure phoenix-[version]-client.jar is in the classpath of your Map
Reduce job jar.</li>
+ <li>To run the job, use the <b>hadoop jar</b> command with the necessary
arguments.</li>
+ </ol>
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