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[SPARK-19003][DOCS] Add Java example in Spark Streaming Guide, section Design Patterns for using foreachRDD #16408

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[SPARK-19003][DOCS] Add Java example in Spark Streaming Guide, section Design Patterns for using foreachRDD #16408

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a229ce8
Added Java example for using connections with streaming.
adesharatushar Dec 26, 2016
ebb5e5d
Made code similar to Scala, corrected formatting.
adesharatushar Dec 28, 2016
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72 changes: 72 additions & 0 deletions docs/streaming-programming-guide.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1246,6 +1246,22 @@ dstream.foreachRDD { rdd =>
}
{% endhighlight %}
</div>
<div data-lang="java" markdown="1">
{% highlight java %}
dstream.foreachRDD(new VoidFunction<JavaRDD<String>>() {
@Override
public void call(JavaRDD<String> rdd) {
final Connection connection = createNewConnection(); // executed at the driver
rdd.foreach(new VoidFunction<String>() {
@Override
public void call(String record) {
connection.send(record); // executed at the worker
}
});
}
});
{% endhighlight %}
</div>
<div data-lang="python" markdown="1">
{% highlight python %}
def sendRecord(rdd):
Expand Down Expand Up @@ -1279,6 +1295,23 @@ dstream.foreachRDD { rdd =>
}
{% endhighlight %}
</div>
<div data-lang="java" markdown="1">
{% highlight java %}
dstream.foreachRDD(new VoidFunction<JavaRDD<String>>() {
@Override
public void call(JavaRDD<String> rdd) {
rdd.foreach(new VoidFunction<String>() {
@Override
public void call(String record) {
Connection connection = createNewConnection();
connection.send(record);
connection.close();
}
});
}
});
{% endhighlight %}
</div>
<div data-lang="python" markdown="1">
{% highlight python %}
def sendRecord(record):
Expand Down Expand Up @@ -1309,6 +1342,25 @@ dstream.foreachRDD { rdd =>
}
{% endhighlight %}
</div>
<div data-lang="java" markdown="1">
{% highlight java %}
dstream.foreachRDD(new VoidFunction<JavaRDD<String>>() {
@Override
public void call(JavaRDD<String> rdd) {
rdd.foreachPartition(new VoidFunction<Iterator<String>>() {
@Override
public void call(Iterator<String> partitionOfRecords) {
Connection connection = createNewConnection();
while (partitionOfRecords.hasNext()) {
connection.send(partitionOfRecords.next());
}
connection.close();
}
});
}
});
{% endhighlight %}
</div>
<div data-lang="python" markdown="1">
{% highlight python %}
def sendPartition(iter):
Expand Down Expand Up @@ -1342,6 +1394,26 @@ dstream.foreachRDD { rdd =>
{% endhighlight %}
</div>

<div data-lang="java" markdown="1">
{% highlight java %}
dstream.foreachRDD(new VoidFunction<JavaRDD<String>>() {
@Override
public void call(JavaRDD<String> rdd) {
rdd.foreachPartition(new VoidFunction<Iterator<String>>() {
@Override
public void call(Iterator<String> partitionOfRecords) {
// ConnectionPool is a static, lazily initialized pool of connections
Connection connection = ConnectionPool.getConnection();
while (partitionOfRecords.hasNext()) {
connection.send(partitionOfRecords.next());
}
ConnectionPool.returnConnection(connection); // return to the pool for future reuse
}
});
}
});
{% endhighlight %}
</div>
<div data-lang="python" markdown="1">
{% highlight python %}
def sendPartition(iter):
Expand Down