Re: KafkaIO Example

[Madhire, Naveen]

I changed the code to see where the problem is with incompatible parameters.

I get the below error, is there an issue with withoutMetadata() method since 
KV<K, V> doesn’t implements POutput ?

java: incompatible types: org.apache.beam.sdk.values.POutput cannot be 
converted to 
org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<java.lang.String,java.lang.String>>

PCollection <KV<String, String>> kafkaRead = p.apply(KafkaIO.read()
        .withTopics(ImmutableList.of("Topic"))
        .withKeyCoder(StringUtf8Coder.of())
        .withValueCoder(StringUtf8Coder.of())
        .updateConsumerProperties((Map) Maps.fromProperties(properties))
        .withoutMetadata());


        kafkaRead
        .apply("Transform ", MapElements.via(new SimpleFunction<KV<String, 
String>, String>() {
            @Override
            public String apply(KV<String, String> input) {
                return input.getKey() + "  " + input.getValue();
            }
        }))
        .apply(TextIO.Write.to("Location"));



Thanks,
Naveen

From: "Madhire, Naveen" <naveen.madh...@capitalone.com>
Reply-To: "user@beam.apache.org" <user@beam.apache.org>
Date: Thursday, January 12, 2017 at 11:55 AM
To: "user@beam.apache.org" <user@beam.apache.org>
Subject: Re: KafkaIO Example

Yes, I’ve verified the kafka connectivity outside of Beam. I wanted to see how 
it works if I read kafka data using Beam.

I am changed the code to use the default direct runner and getting a 
compilation error now,


java: cannot find symbol
  symbol:   method 
apply(java.lang.String,org.apache.beam.sdk.transforms.MapElements<org.apache.beam.sdk.values.KV<java.lang.String,java.lang.String>,java.lang.String>)
  location: interface org.apache.beam.sdk.values.POutput

Am I missing any other dependency in Pom? Please let me know.

Code:

PipelineOptions options = PipelineOptionsFactory.create();

Pipeline p = Pipeline.create(options);

//Read from Kafka Topic
try {
    InputStream props = Resources.getResource("client.properties").openStream();
    Properties properties = new Properties();
    properties.load(props);


    p.apply(KafkaIO.read()
        .withTopics(ImmutableList.of("Topic"))
        .withKeyCoder(StringUtf8Coder.of())
        .withValueCoder(StringUtf8Coder.of())
        .updateConsumerProperties((Map) Maps.fromProperties(properties))
        .withoutMetadata())
        .apply("Transform ", MapElements.via(new SimpleFunction<KV<String, 
String>, String>() {
            @Override
            public String apply(KV<String, String> input) {
                return input.getKey() + "  " + input.getValue();
            }
        }))
        .apply(TextIO.Write.to("Location"));
}

I’ve the below dependencies included in my pom,



<!-- Apache Beam Dependencies -->
<dependency>
    <groupId>org.apache.beam</groupId>
    <artifactId>beam-sdks-java-io-kafka</artifactId>
    <version>0.4.0</version>
</dependency>
<dependency>
    <groupId>org.apache.beam</groupId>
    <artifactId>beam-sdks-java-core</artifactId>
    <version>0.4.0</version>
</dependency>
<dependency>
    <groupId>org.apache.beam</groupId>
    <artifactId>beam-runners-direct-java</artifactId>
    <version>0.4.0</version>
</dependency>
<dependency>
    <groupId>org.apache.beam</groupId>
    <artifactId>beam-runners-core-java</artifactId>
    <version>0.4.0</version>
</dependency>
<!—Business logic -->
<dependency>
    <groupId>org.drools</groupId>
    <artifactId>drools-core</artifactId>
    <version>6.2.0.Final</version>
</dependency>

Thanks,
Naveen

From: Lukasz Cwik <lc...@google.com>
Reply-To: "user@beam.apache.org" <user@beam.apache.org>
Date: Thursday, January 12, 2017 at 10:58 AM
To: "user@beam.apache.org" <user@beam.apache.org>
Subject: Re: KafkaIO Example

I'm assuming you mean DirectRunner and not DataflowDirectRunner.

On Wed, Jan 11, 2017 at 4:23 PM, Raghu Angadi 
<rang...@google.com<mailto:rang...@google.com>> wrote:

On Wed, Jan 11, 2017 at 1:56 PM, Madhire, Naveen 
<naveen.madh...@capitalone.com<mailto:naveen.madh...@capitalone.com>> wrote:
I can confirm the authorization and authentication to Kafka is behaving 
correctly,

Did you confirm this within Beam/KafkIO context or outside? When I last checked 
Kafka requires the the credentials file to be available on local filesystem 
where the KafkaConsumer runs. All the workers need to have this file. Shipping 
these files to workers depends on the runner/execution environment.

Can you try with DataflowDirectRunner? That would be simpler to debug.

Raghu.



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Capital One and/or its affiliates and may only be used solely in performance of 
work or services for Capital One. The information transmitted herewith is 
intended only for use by the individual or entity to which it is addressed. If 
the reader of this message is not the intended recipient, you are hereby 
notified that any review, retransmission, dissemination, distribution, copying 
or other use of, or taking of any action in reliance upon this information is 
strictly prohibited. If you have received this communication in error, please 
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