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[SPARK-8378][Streaming]Add the Python API for Flume #6830
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# | ||
# Licensed to the Apache Software Foundation (ASF) under one or more | ||
# contributor license agreements. See the NOTICE file distributed with | ||
# this work for additional information regarding copyright ownership. | ||
# The ASF licenses this file to You under the Apache License, Version 2.0 | ||
# (the "License"); you may not use this file except in compliance with | ||
# the License. You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
# | ||
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""" | ||
Counts words in UTF8 encoded, '\n' delimited text received from the network every second. | ||
Usage: flume_wordcount.py <hostname> <port> | ||
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To run this on your local machine, you need to setup Flume first, see | ||
https://flume.apache.org/documentation.html | ||
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and then run the example | ||
`$ bin/spark-submit --jars external/flume-assembly/target/scala-*/\ | ||
spark-streaming-flume-assembly-*.jar examples/src/main/python/streaming/flume_wordcount.py \ | ||
localhost 12345 | ||
""" | ||
from __future__ import print_function | ||
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import sys | ||
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from pyspark import SparkContext | ||
from pyspark.streaming import StreamingContext | ||
from pyspark.streaming.flume import FlumeUtils | ||
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if __name__ == "__main__": | ||
if len(sys.argv) != 3: | ||
print("Usage: flume_wordcount.py <hostname> <port>", file=sys.stderr) | ||
exit(-1) | ||
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sc = SparkContext(appName="PythonStreamingFlumeWordCount") | ||
ssc = StreamingContext(sc, 1) | ||
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hostname, port = sys.argv[1:] | ||
kvs = FlumeUtils.createStream(ssc, hostname, int(port)) | ||
lines = kvs.map(lambda x: x[1]) | ||
counts = lines.flatMap(lambda line: line.split(" ")) \ | ||
.map(lambda word: (word, 1)) \ | ||
.reduceByKey(lambda a, b: a+b) | ||
counts.pprint() | ||
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ssc.start() | ||
ssc.awaitTermination() |
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<?xml version="1.0" encoding="UTF-8"?> | ||
<!-- | ||
~ Licensed to the Apache Software Foundation (ASF) under one or more | ||
~ contributor license agreements. See the NOTICE file distributed with | ||
~ this work for additional information regarding copyright ownership. | ||
~ The ASF licenses this file to You under the Apache License, Version 2.0 | ||
~ (the "License"); you may not use this file except in compliance with | ||
~ the License. You may obtain a copy of the License at | ||
~ | ||
~ http://www.apache.org/licenses/LICENSE-2.0 | ||
~ | ||
~ Unless required by applicable law or agreed to in writing, software | ||
~ distributed under the License is distributed on an "AS IS" BASIS, | ||
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
~ See the License for the specific language governing permissions and | ||
~ limitations under the License. | ||
--> | ||
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | ||
<modelVersion>4.0.0</modelVersion> | ||
<parent> | ||
<groupId>org.apache.spark</groupId> | ||
<artifactId>spark-parent_2.10</artifactId> | ||
<version>1.5.0-SNAPSHOT</version> | ||
<relativePath>../../pom.xml</relativePath> | ||
</parent> | ||
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<groupId>org.apache.spark</groupId> | ||
<artifactId>spark-streaming-flume-assembly_2.10</artifactId> | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Hi guys, Sorry I'm late to the party, but why is this new assembly necessary? It creates an 80MB jar file that repackages a bunch of things already present in the Spark assembly (e.g. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Nope, none of the fume stuff is present in the spark-assembly. That is On Mon, Jul 6, 2015 at 2:02 PM, Marcelo Vanzin notifications@github.com
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Well, two things:
So any way you look at it, there is still something to be fixed here. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more.
On Mon, Jul 6, 2015 at 2:19 PM, Marcelo Vanzin notifications@github.com
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<packaging>jar</packaging> | ||
<name>Spark Project External Flume Assembly</name> | ||
<url>http://spark.apache.org/</url> | ||
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<properties> | ||
<sbt.project.name>streaming-flume-assembly</sbt.project.name> | ||
</properties> | ||
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<dependencies> | ||
<dependency> | ||
<groupId>org.apache.spark</groupId> | ||
<artifactId>spark-streaming-flume_${scala.binary.version}</artifactId> | ||
<version>${project.version}</version> | ||
</dependency> | ||
<dependency> | ||
<groupId>org.apache.spark</groupId> | ||
<artifactId>spark-streaming_${scala.binary.version}</artifactId> | ||
<version>${project.version}</version> | ||
<scope>provided</scope> | ||
</dependency> | ||
<dependency> | ||
<groupId>org.apache.avro</groupId> | ||
<artifactId>avro</artifactId> | ||
<version>${avro.version}</version> | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. The dependencies of
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This seems like an avro bug. Can you file a jira for Avro? Avro should be compatible within the same minor version - 1.7.x There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Do you know where the other version of avro is coming up ? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more.
I think
Actually "mvn dependency:tree" shows both |
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</dependency> | ||
<dependency> | ||
<groupId>org.apache.avro</groupId> | ||
<artifactId>avro-ipc</artifactId> | ||
<version>${avro.version}</version> | ||
<exclusions> | ||
<exclusion> | ||
<groupId>io.netty</groupId> | ||
<artifactId>netty</artifactId> | ||
</exclusion> | ||
<exclusion> | ||
<groupId>org.mortbay.jetty</groupId> | ||
<artifactId>jetty</artifactId> | ||
</exclusion> | ||
<exclusion> | ||
<groupId>org.mortbay.jetty</groupId> | ||
<artifactId>jetty-util</artifactId> | ||
</exclusion> | ||
<exclusion> | ||
<groupId>org.mortbay.jetty</groupId> | ||
<artifactId>servlet-api</artifactId> | ||
</exclusion> | ||
<exclusion> | ||
<groupId>org.apache.velocity</groupId> | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Why do you need to pull all these in? Doesn't the spark-streaming-flume artifact pull these in anyway? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. These are exclusions.. not pulling in. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. ah, guess I need more coffee |
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<artifactId>velocity</artifactId> | ||
</exclusion> | ||
</exclusions> | ||
</dependency> | ||
</dependencies> | ||
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<build> | ||
<outputDirectory>target/scala-${scala.binary.version}/classes</outputDirectory> | ||
<testOutputDirectory>target/scala-${scala.binary.version}/test-classes</testOutputDirectory> | ||
<plugins> | ||
<plugin> | ||
<groupId>org.apache.maven.plugins</groupId> | ||
<artifactId>maven-shade-plugin</artifactId> | ||
<configuration> | ||
<shadedArtifactAttached>false</shadedArtifactAttached> | ||
<outputFile>${project.build.directory}/scala-${scala.binary.version}/spark-streaming-flume-assembly-${project.version}.jar</outputFile> | ||
<artifactSet> | ||
<includes> | ||
<include>*:*</include> | ||
</includes> | ||
</artifactSet> | ||
<filters> | ||
<filter> | ||
<artifact>*:*</artifact> | ||
<excludes> | ||
<exclude>META-INF/*.SF</exclude> | ||
<exclude>META-INF/*.DSA</exclude> | ||
<exclude>META-INF/*.RSA</exclude> | ||
</excludes> | ||
</filter> | ||
</filters> | ||
</configuration> | ||
<executions> | ||
<execution> | ||
<phase>package</phase> | ||
<goals> | ||
<goal>shade</goal> | ||
</goals> | ||
<configuration> | ||
<transformers> | ||
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/> | ||
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"> | ||
<resource>reference.conf</resource> | ||
</transformer> | ||
<transformer implementation="org.apache.maven.plugins.shade.resource.DontIncludeResourceTransformer"> | ||
<resource>log4j.properties</resource> | ||
</transformer> | ||
<transformer implementation="org.apache.maven.plugins.shade.resource.ApacheLicenseResourceTransformer"/> | ||
<transformer implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer"/> | ||
</transformers> | ||
</configuration> | ||
</execution> | ||
</executions> | ||
</plugin> | ||
</plugins> | ||
</build> | ||
</project> | ||
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Is the decoding logic the same here too? UTF-8 encoded string, or custom decoding function? If yes, we should move that snippet explaining this outside of both approaches and specify that it is applicable to both.
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I updated the doc. Because there is no a Python example for
FlumeUtils.createPollingStream
(it requires the user installing the Spark sink jar to Flume, so we cannot write an out-of-the-box example), I just copied the description of the encoding function to here.