Re: Streaming. Cannot get socketTextStream to receive anything.
You will have to define your own stream-to-iterator function and use the socketStream. The function should return custom delimited object as bytes are continuously coming in. When data is insufficient, the function should block. TD On Jul 23, 2014 6:52 PM, kytay kaiyang@gmail.com wrote: Hi TD You are right, I did not include \n to delimit the string flushed. That's the reason. Is there a way for me to define the delimiter? Like SOH or ETX instead of \n Regards kytay -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Solved-Streaming-Cannot-get-socketTextStream-to-receive-anything-tp9382p10558.html Sent from the Apache Spark User List mailing list archive at Nabble.com.
Re: Streaming. Cannot get socketTextStream to receive anything.
Hi TD You are right, I did not include \n to delimit the string flushed. That's the reason. Is there a way for me to define the delimiter? Like SOH or ETX instead of \n Regards kytay -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Solved-Streaming-Cannot-get-socketTextStream-to-receive-anything-tp9382p10558.html Sent from the Apache Spark User List mailing list archive at Nabble.com.
Re: Streaming. Cannot get socketTextStream to receive anything.
When you are sending data using simple socket code to send messages, are those messages \n delimited? If its not, then the receiver of socketTextSTream, wont identify them as separate events, and keep buffering them. TD On Sun, Jul 13, 2014 at 10:49 PM, kytay kaiyang@gmail.com wrote: Hi Tobias I have been using local[4] to test. My problem is likely caused by the tcp host server that I am trying the emulate. I was trying to emulate the tcp host to send out messages. (although I am not sure at the moment :D) First way I tried was to use a tcp tool called, Hercules. Second way was to write a simple socket code to send message at interval. Like the one shown in #2 of my first post. I suspect the reason why it don't work is due the messages are not flush so no message was received on Spark Streaming. I think I will need to do more testing to understand the behavior. I am currently not sure why nc -lk is working, and not the other tools or codes I am testing with. Regards. -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Solved-Streaming-Cannot-get-socketTextStream-to-receive-anything-tp9382p9588.html Sent from the Apache Spark User List mailing list archive at Nabble.com.
Re: Streaming. Cannot get socketTextStream to receive anything.
Hi Akhil Das Thanks. I tried the codes. and it works. There's a problem with my socket codes that is not flushing the content out, and for the test tool, Hercules, I have to close the socket connection to flush the content out. I am going to troubleshoot why nc works, and the codes and test tool don't. -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Streaming-Cannot-get-socketTextStream-to-receive-anything-tp9382p9576.html Sent from the Apache Spark User List mailing list archive at Nabble.com.
Re: Streaming. Cannot get socketTextStream to receive anything.
Hi, I experienced exactly the same problems when using SparkContext with local[1] master specification, because in that case one thread is used for receiving data, the others for processing. As there is only one thread running, no processing will take place. Once you shut down the connection, the receiver thread will be used for processing. Any chance you run into the same issue? Tobias On Mon, Jul 14, 2014 at 11:45 AM, kytay kaiyang@gmail.com wrote: Hi Akhil Das Thanks. I tried the codes. and it works. There's a problem with my socket codes that is not flushing the content out, and for the test tool, Hercules, I have to close the socket connection to flush the content out. I am going to troubleshoot why nc works, and the codes and test tool don't. -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Streaming-Cannot-get-socketTextStream-to-receive-anything-tp9382p9576.html Sent from the Apache Spark User List mailing list archive at Nabble.com.
Re: Streaming. Cannot get socketTextStream to receive anything.
Hi Tobias I have been using local[4] to test. My problem is likely caused by the tcp host server that I am trying the emulate. I was trying to emulate the tcp host to send out messages. (although I am not sure at the moment :D) First way I tried was to use a tcp tool called, Hercules. Second way was to write a simple socket code to send message at interval. Like the one shown in #2 of my first post. I suspect the reason why it don't work is due the messages are not flush so no message was received on Spark Streaming. I think I will need to do more testing to understand the behavior. I am currently not sure why nc -lk is working, and not the other tools or codes I am testing with. Regards. -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Solved-Streaming-Cannot-get-socketTextStream-to-receive-anything-tp9382p9588.html Sent from the Apache Spark User List mailing list archive at Nabble.com.
Re: Streaming. Cannot get socketTextStream to receive anything.
You simply use the *nc* command to do this. like:
nc -p 12345
will open the 12345 port and from the terminal you can provide whatever
input you require for your StreamingCode.
Thanks
Best Regards
On Fri, Jul 11, 2014 at 2:41 AM, kytay kaiyang@gmail.com wrote:
Hi
I am learning spark streaming, and is trying out the JavaNetworkCount
example.
#1 - This is the code I wrote
JavaStreamingContext sctx = new JavaStreamingContext(local, appName, new
Duration(5000));
JavaReceiverInputDStreamString lines = sctx.socketTextStream(127.0.0.1,
);
JavaDStreamString words =lines.flatMap(
new FlatMapFunctionString, String() {
@Override
public IterableString call(String arg0) throws
Exception {
System.out.println(Print text: + arg0);
return Arrays.asList(arg0.split( ));
}
});
#2 - This is the socketCode I am using
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class TestTcpServer {
public static void main(String argv[]) throws Exception
{
String clientSentence;
String capitalizedSentence;
ServerSocket welcomeSocket = new ServerSocket();
int i = 0;
while(true)
{
Socket connectionSocket = welcomeSocket.accept();
BufferedReader inFromClient = new BufferedReader(
new
InputStreamReader(connectionSocket.getInputStream())
);
DataOutputStream outToClient = new
DataOutputStream(connectionSocket.getOutputStream());
while(true)
{
String sendingStr = Sending... data...
+ i;
outToClient.writeBytes(sendingStr);
System.out.println(sendingStr);
i++;
Thread.sleep(3000);
}
}
}
}
What I am trying to do is to get the JavaNetworkCount in #1 to start
printing all the text I am receiving. But so far I failed to achieve that.
I have been using Hercules Setup
http://www.hw-group.com/products/hercules/details_en.html to simulate
as
a TCP server, as well as a simple serversocket code in #2...
But I am not seeing any text being printed on the console.
Is public IterableString call(String arg0) throws Exception being called
every 5 secs?
The console log is in http://pastebin.com/THzdzGhg
http://pastebin.com/THzdzGhg
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Re: Streaming. Cannot get socketTextStream to receive anything.
Sorry, the command is
nc -lk 12345
Thanks
Best Regards
On Fri, Jul 11, 2014 at 6:46 AM, Akhil Das ak...@sigmoidanalytics.com
wrote:
You simply use the *nc* command to do this. like:
nc -p 12345
will open the 12345 port and from the terminal you can provide whatever
input you require for your StreamingCode.
Thanks
Best Regards
On Fri, Jul 11, 2014 at 2:41 AM, kytay kaiyang@gmail.com wrote:
Hi
I am learning spark streaming, and is trying out the JavaNetworkCount
example.
#1 - This is the code I wrote
JavaStreamingContext sctx = new JavaStreamingContext(local, appName, new
Duration(5000));
JavaReceiverInputDStreamString lines =
sctx.socketTextStream(127.0.0.1,
);
JavaDStreamString words =lines.flatMap(
new FlatMapFunctionString, String() {
@Override
public IterableString call(String arg0) throws
Exception {
System.out.println(Print text: + arg0);
return Arrays.asList(arg0.split( ));
}
});
#2 - This is the socketCode I am using
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class TestTcpServer {
public static void main(String argv[]) throws Exception
{
String clientSentence;
String capitalizedSentence;
ServerSocket welcomeSocket = new ServerSocket();
int i = 0;
while(true)
{
Socket connectionSocket = welcomeSocket.accept();
BufferedReader inFromClient = new BufferedReader(
new
InputStreamReader(connectionSocket.getInputStream())
);
DataOutputStream outToClient = new
DataOutputStream(connectionSocket.getOutputStream());
while(true)
{
String sendingStr = Sending... data...
+ i;
outToClient.writeBytes(sendingStr);
System.out.println(sendingStr);
i++;
Thread.sleep(3000);
}
}
}
}
What I am trying to do is to get the JavaNetworkCount in #1 to start
printing all the text I am receiving. But so far I failed to achieve that.
I have been using Hercules Setup
http://www.hw-group.com/products/hercules/details_en.html to
simulate as
a TCP server, as well as a simple serversocket code in #2...
But I am not seeing any text being printed on the console.
Is public IterableString call(String arg0) throws Exception being called
every 5 secs?
The console log is in http://pastebin.com/THzdzGhg
http://pastebin.com/THzdzGhg
--
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Re: Streaming. Cannot get socketTextStream to receive anything.
Hi Akhil Das
I have tried the
nc -lk
command too.
I was hoping the System.out.println(Print text: + arg0); is printed when
a stream is processed when lines.flatMap(...) is called.
But from my test with nc -lk , nothing is printed on the console at
all.
==
To test out whether the nc tool is working, I have also test the nc tool
with the Hercules TCP client test tool, it works fine.
So now the question goes back to why
JavaDStreamString words =lines.flatMap(
new FlatMapFunctionString, String() {
@Override
public IterableString call(String arg0) throws
Exception {
System.out.println(Print text: + arg0);
return Arrays.asList(arg0.split( ));
}
});
is not printing the text I am sending through nc -lk .
===
Is there any other way to test if socketTextStream(...) is working?
Regards.
--
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Re: Streaming. Cannot get socketTextStream to receive anything.
I think I should be seeing any line of text that I have typed in the nc command. -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Streaming-Cannot-get-socketTextStream-to-receive-anything-tp9382p9410.html Sent from the Apache Spark User List mailing list archive at Nabble.com.
Re: Streaming. Cannot get socketTextStream to receive anything.
Can you try this piece of code?
SparkConf sparkConf = new SparkConf().setAppName(JavaNetworkWordCount
);
JavaStreamingContext ssc = new JavaStreamingContext(sparkConf, new
Duration(1000));
JavaReceiverInputDStreamString lines = ssc.socketTextStream(
args[0], Integer.parseInt(args[1]), StorageLevels.
MEMORY_AND_DISK_SER);
JavaDStreamString words = lines.flatMap(new FlatMapFunctionString,
String() {
@Override
public IterableString call(String x) {
return Lists.newArrayList(SPACE.split(x));
}
});
JavaPairDStreamString, Integer wordCounts = words.mapToPair(
new PairFunctionString, String, Integer() {
@Override
public Tuple2String, Integer call(String s) {
return new Tuple2String, Integer(s, 1);
}
}).reduceByKey(new Function2Integer, Integer, Integer() {
@Override
public Integer call(Integer i1, Integer i2) {
return i1 + i2;
}
});
wordCounts.print();
ssc.start();
ssc.awaitTermination();
Taken from
https://github.com/apache/spark/blob/master/examples/src/main/java/org/apache/spark/examples/streaming/JavaNetworkWordCount.java
Thanks
Best Regards
On Fri, Jul 11, 2014 at 9:58 AM, kytay kaiyang@gmail.com wrote:
I think I should be seeing any line of text that I have typed in the nc
command.
--
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Sent from the Apache Spark User List mailing list archive at Nabble.com.
Streaming. Cannot get socketTextStream to receive anything.
Hi
I am learning spark streaming, and is trying out the JavaNetworkCount
example.
#1 - This is the code I wrote
JavaStreamingContext sctx = new JavaStreamingContext(local, appName, new
Duration(5000));
JavaReceiverInputDStreamString lines = sctx.socketTextStream(127.0.0.1,
);
JavaDStreamString words =lines.flatMap(
new FlatMapFunctionString, String() {
@Override
public IterableString call(String arg0) throws
Exception {
System.out.println(Print text: + arg0);
return Arrays.asList(arg0.split( ));
}
});
#2 - This is the socketCode I am using
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class TestTcpServer {
public static void main(String argv[]) throws Exception
{
String clientSentence;
String capitalizedSentence;
ServerSocket welcomeSocket = new ServerSocket();
int i = 0;
while(true)
{
Socket connectionSocket = welcomeSocket.accept();
BufferedReader inFromClient = new BufferedReader(
new
InputStreamReader(connectionSocket.getInputStream())
);
DataOutputStream outToClient = new
DataOutputStream(connectionSocket.getOutputStream());
while(true)
{
String sendingStr = Sending... data... + i;
outToClient.writeBytes(sendingStr);
System.out.println(sendingStr);
i++;
Thread.sleep(3000);
}
}
}
}
What I am trying to do is to get the JavaNetworkCount in #1 to start
printing all the text I am receiving. But so far I failed to achieve that.
I have been using Hercules Setup
http://www.hw-group.com/products/hercules/details_en.html to simulate as
a TCP server, as well as a simple serversocket code in #2...
But I am not seeing any text being printed on the console.
Is public IterableString call(String arg0) throws Exception being called
every 5 secs?
The console log is in http://pastebin.com/THzdzGhg
http://pastebin.com/THzdzGhg
--
View this message in context:
http://apache-spark-user-list.1001560.n3.nabble.com/Streaming-Cannot-get-socketTextStream-to-receive-anything-tp9382.html
Sent from the Apache Spark User List mailing list archive at Nabble.com.
