accumulo-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From els...@apache.org
Subject [5/8] git commit: ACCUMULO-1783 Add a brief example on how to use some flight data with accumulostorage
Date Wed, 13 Nov 2013 04:25:08 GMT
ACCUMULO-1783 Add a brief example on how to use some flight data with accumulostorage


Project: http://git-wip-us.apache.org/repos/asf/accumulo-pig/repo
Commit: http://git-wip-us.apache.org/repos/asf/accumulo-pig/commit/7158ff31
Tree: http://git-wip-us.apache.org/repos/asf/accumulo-pig/tree/7158ff31
Diff: http://git-wip-us.apache.org/repos/asf/accumulo-pig/diff/7158ff31

Branch: refs/heads/ACCUMULO-1783
Commit: 7158ff311b675e1bead3cacbb099c9b75aa1f7bf
Parents: 55bfcfb
Author: Josh Elser <elserj@apache.org>
Authored: Tue Nov 12 19:11:01 2013 -0800
Committer: Josh Elser <elserj@apache.org>
Committed: Tue Nov 12 19:11:01 2013 -0800

----------------------------------------------------------------------
 site/docs/flight-example.md | 93 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/accumulo-pig/blob/7158ff31/site/docs/flight-example.md
----------------------------------------------------------------------
diff --git a/site/docs/flight-example.md b/site/docs/flight-example.md
new file mode 100644
index 0000000..9887df2
--- /dev/null
+++ b/site/docs/flight-example.md
@@ -0,0 +1,93 @@
+---
+layout: docs
+title: Air Flight Example
+permalink: /docs/flight-example/
+---
+
+We can use some airplane flight information as a example to show some basic functionality
that we can provide with this
+Accumulo and Pig support. The [American Statistical Association](www.amstat.org) has a nice
collection of [data sets
+regarding flights](http://stat-computing.org/dataexpo/2009/the-data.html) from 1987 through
2008. We can use the data
+set of flights and the [data set about airports](http://stat-computing.org/dataexpo/2009/supplemental-data.html)
to
+easily join some records in a few lines of Pig.
+
+## Writing the data
+
+Download at least one year of the flight data, decompress it and place it into HDFS. From
this point, we can write a few
+lines of Pig to read the file using PigStorage, create a unique row key and configure _AccumuloStorage_
to use the given
+column names to write the data into Accumulo. We need to make sure we include the accumulo-pig
jar which has the
+_AccumuloStorage_ implementation we're leveraging, in addition to the Accumulo, Thrift and
ZooKeeper dependencies.
+
+<pre class="code">
+register /path/to/accumulo-pig-1.4.4-SNAPSHOT.jar;
+register /usr/local/lib/accumulo/lib/accumulo-core-1.4.4.jar;
+register /usr/local/lib/accumulo/lib/libthrift-0.6.1.jar;
+register /usr/local/lib/zookeeper/zookeeper-3.4.5.jar;
+register /usr/local/lib/accumulo/lib/cloudtrace-1.4.4.jar;
+
+DEFINE FORMAT org.apache.accumulo.pig.FORMAT();
+
+flight_data = LOAD '/flights.csv' using PigStorage(',') as (year:int, month:int, dayofmonth:int,
dayofweek:int, departure_time:int, scheduled_departure_time:int, 
+        arrival_time:int, scheduled_arrival_time:int, carrier:chararray, flight_number:int,
tail_number:chararray, actual_elapsed_time:int, 
+        scheduled_elapsed_time:int, air_time:int, arrival_delay:int, departure_delay:int,
origin:chararray, destination:chararray, 
+        distance:int, taxi_in:int, taxi_out:int, cancelled:int, cancellation_code:chararray,
diverted:int, carrier_delay:chararray, 
+        weather_delay:chararray, nas_delay:chararray, security_delay:chararray, late_aircraft_delay:chararray);
+
+flight_data = FOREACH flight_data GENERATE CONCAT(FORMAT('%04d-%02d-%02d', year, month, dayofmonth),
CONCAT('_', CONCAT(carrier, CONCAT('_', (chararray)flight_number)))) as rowkey,
+        departure_time, scheduled_departure_time, arrival_time, scheduled_arrival_time, carrier,
flight_number, tail_number, actual_elapsed_time, scheduled_elapsed_time, air_time,
+        arrival_delay, departure_delay, origin, destination, distance, taxi_in, taxi_out,
cancelled, cancellation_code, diverted, carrier_delay, weather_delay, nas_delay,
+        security_delay, late_aircraft_delay;
+
+STORE flight_data into 'accumulo://flights?instance=accumulo&amp;user=root&amp;password=secret&amp;zookeepers=localhost'
using 
+        org.apache.accumulo.pig.AccumuloStorage('departure_time,scheduled_departure_time,arrival_time,scheduled_arrival_time,carrier,flight_number,tail_number,actual_elapsed_time,scheduled_elapsed_time,air_time,arrival_delay,departure_delay,origin,destination,distance,taxi_in,taxi_out,cancelled,cancellation_code,diverted,carrier_delay,weather_delay,nas_delay,security_delay,late_aircraft_delay');
+</pre>
+
+This will load a years worth of data into Accumulo with a rowkey that is the concatenation
of the year, month and day of
+the flight, the carrier code, and the flight number, which should give us good distribution
and parallelism inside of
+Accumulo.
+
+Next, we want to do the same for the airport information:
+
+<pre class="code">
+register /path/to/accumulo-pig-1.4.4-SNAPSHOT.jar;
+register /usr/local/lib/accumulo/lib/accumulo-core-1.4.4.jar;
+register /usr/local/lib/accumulo/lib/libthrift-0.6.1.jar;
+register /usr/local/lib/zookeeper/zookeeper-3.4.5.jar;
+register /usr/local/lib/accumulo/lib/cloudtrace-1.4.4.jar;
+
+airports = LOAD '/airports.csv' using PigStorage(',') as (code:chararray, name:chararray,
city:chararray, state:chararray, country:chararray, latitude:double, longitude:double);
+
+airports = FOREACH airports GENERATE REPLACE(code, '"', '') as code, REPLACE(name, '"', '')
as name, REPLACE(city, '"', '') as city, 
+        REPLACE(state, '"', '') as state, REPLACE(country, '"', '') as country, latitude,
longitude;
+
+airports = FOREACH airports GENERATE code as rowkey, code, name, city, state, country, latitude,
longitude;
+
+STORE airports into 'accumulo://airports?instance=accumulo&amp;user=root&amp;password=secret&amp;zookeepers=localhost'
using 
+        org.apache.accumulo.pig.AccumuloStorage('code,name,city,state,country,latitude,longitude');
+</pre>
+
+At this point, we now have flight information in the 'flight_data' Accumulo table and airport
information in the
+'airports' Accumulo table. We can join information about the origin airport code with the
actual airport information.
+
+<pre class="code">
+<span class="comment">-- Read a reduced set of our flight data</span>
+<span class="variable">flight_data</span> = <span class="keyword">LOAD</span>
<span class="constants">'accumulo://flights?instance=accumulo&amp;user=pig&amp;password=password&amp;zookeepers=localhost&amp;fetch_columns=destination,departure_time,scheduled_departure_time,flight_number,taxi_in,taxi_out,origin'</span>
+<span class="keyword">USING</span> org.apache.accumulo.pig.AccumuloStorage()
<span class="keyword">AS</span> (rowkey:<span class="type">chararray</span>,
data:<span class="type">map[]</span>);
+
+<span class="comment">-- Also read airport information</span>
+<span class="variable">airports</span> = <span class="keyword">LOAD</span>
<span class="constants">'accumulo://airports?instance=accumulo&amp;user=pig&amp;password=password&amp;zookeepers=localhost'</span>
<span class="keyword">USING</span>
+org.apache.accumulo.pig.AccumuloStorage() <span class="keyword">AS</span> (rowkey:<span
class="type">chararray</span>, data:<span class="type">map[]</span>);
+
+<span class="comment">-- Permute the map</span>
+<span class="variable">flight_data</span> = <span class="keyword">FOREACH</span>
<span class="variable">flight_data</span> <span class="keyword">GENERATE</span>
rowkey, data#<span class="constants">'origin'</span> <span class="keyword">AS</span>
origin, data#<span class="constants">'destination'</span> <span class="keyword">AS</span>
destination, data#<span class="constants">'departure_time'</span> <span class="keyword">AS</span>
departure_time,
+data#<span class="constants">'scheduled_departure_time'</span> <span class="keyword">AS</span>
scheduled_departure_time, data#<span class="constants">'flight_number'</span>
<span class="keyword">AS</span> flight_number, data#<span class="constants">'taxi_in'</span>
<span class="keyword">AS</span> taxi_in, data#<span class="constants">'taxi_out'</span>
<span class="keyword">AS</span> taxi_out;
+
+<span class="comment">-- Permute the map</span>
+<span class="variable">airports</span> = <span class="keyword">FOREACH</span>
<span class="variable">airports</span> <span class="keyword">GENERATE</span>
data#<span class="constants">'name'</span> <span class="keyword">AS</span>
name, data#<span class="constants">'state'</span> <span class="keyword">AS</span>
state, data#<span class="constants">'code'</span> <span class="keyword">AS</span>
code, data#<span class="constants">'country'</span> <span class="keyword">AS</span>
country, data#<span class="constants">'city'</span> <span class="keyword">AS</span>
city;
+
+<span class="comment">-- Add airport information about the origin of the flight</span>
+<span class="variable">flights_with_origin</span> = <span class="keyword">JOIN</span>
<span class="variable">flight_data</span> <span class="keyword">BY</span>
origin, <span class="variable">airports</span> <span class="keyword">BY</span>
code;
+
+<span class="comment">-- Store this information back into Accumulo in a new table</span>
+<span class="keyword">STORE</span> <span class="variable">flights_with_origin</span>
<span class="keyword">INTO</span> <span class="constants">'accumulo://flights_with_airports?instance=accumulo1.4&amp;user=root&amp;password=secret&amp;zookeepers=localhost'</span>
\
+<span class="keyword">USING</span> org.apache.accumulo.pig.AccumuloStorage(<span
class="constants">'origin,destination,departure_time,scheduled_departure_time,flight_number,taxi_in,taxi_out,name,state,code,country,city'</span>);
+</pre>


Mime
View raw message