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https://issues.apache.org/jira/browse/HADOOP-15207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Aaron Fabbri resolved HADOOP-15207.
-----------------------------------
Resolution: Invalid
Can someone please ban this user? Similar SEO spam has been pasted on other
sites I can see. We should remove the link and/or delete the Jira too.
> Hadoop performance Issues
> -------------------------
>
> Key: HADOOP-15207
> URL: https://issues.apache.org/jira/browse/HADOOP-15207
> Project: Hadoop Common
> Issue Type: Bug
> Components: common
> Affects Versions: HADOOP-13345
> Reporter: nicole wells
> Priority: Minor
>
> I am doing a hadoop project where I am working with 100MB, 500MB, 1GB files.
> A multinode hadoop cluster with 4 nodes is implemented for the purpose. The
> time taken for running the mapreduce program in multinode cluster is much
> larger than the time taken in running single node cluster setup. Also, it is
> shocking to observe that the basic Java program(without [Hadoop
> BigData|https://mindmajix.com/hadoop-training]) finishes the operation faster
> than both the single and multi node clusters. Here is the code for the mapper
> class:
>
> {code:java}
> public class myMapperClass extends MapReduceBase implements
> Mapper<LongWritable, Text, Text, IntWritable>
> {
> private final static IntWritable one = new IntWritable(1);
> private final static IntWritable two = new IntWritable(2);
> private final static IntWritable three = new IntWritable(3);
> private final static IntWritable four = new IntWritable(4);
> private final static IntWritable five = new IntWritable(5);
> private final static IntWritable six = new IntWritable(6);
> private final static IntWritable seven = new IntWritable(7);
> private final static IntWritable eight = new IntWritable(8);
> private final static IntWritable nine= new IntWritable(9);
> private Text srcIP,srcIPN;
> private Text dstIP,dstIPN;
> private Text srcPort,srcPortN;
> private Text dstPort,dstPortN;
> private Text counter1,counter2,counter3,counter4,counter5 ;
> //private Text total_records;
> int ddos_line = 0;
> //map method that performs the tokenizer job and framing the initial key
> value pairs
> @Override
> public void map(LongWritable key, Text value, OutputCollector<Text,
> IntWritable> output, Reporter reporter) throws IOException
> {
> String line1 = value.toString();
> ddos_line++;
> int pos1=0;
> int lineno=0;
> int[] count = {100000, 100000, 100000, 100000, 100000};
> int[] lineIndex = {0, 0, 0, 0, 0};
> for(int i=0;i<9;i++)
> {
> pos1 = line1.indexOf("|",pos1+1);
> }
> srcIP = new Text( line1.substring(0,line1.indexOf("|")) );
> String srcIPP = srcIP.toString();
> dstIP = new Text(line1.substring(
> srcIPP.length()+1,line1.indexOf("|",srcIPP.length()+1)) ) ;
> srcPort = new Text( line1.substring(pos1+1,line1.indexOf("|",pos1+1))
> );
> pos1 = line1.indexOf("|",pos1+1);
> dstPort = new Text( line1.substring(pos1+1,line1.indexOf("|",pos1+1))
> );
> //BufferedReader br = new BufferedReader(new
> FileReader("/home/yogi/Desktop/normal_small"));
> FileSystem fs = FileSystem.get(new Configuration());
> FileStatus[] status = fs.listStatus(new
> Path("hdfs://master:54310/usr/local/hadoop/input/normal_small"));
> BufferedReader br=new BufferedReader(new
> InputStreamReader(fs.open(status[0].getPath())));
> String line=br.readLine();
> lineno++;
> boolean bool = true;
> while (bool) {
> for(int i=0; i<5;i++)
> {
> if(bool==false)
> break;
> int pos=0;
> int temp;
> for(int j=0;j<9;j++)
> {
> pos = line.indexOf("|",pos+1);
> }
> srcIPN = new Text( line.substring(0,line.indexOf("|")) );
> String srcIPP2 = srcIPN.toString();
> dstIPN = new Text(line.substring(
> srcIPP2.length()+1,line.indexOf("|",srcIPP2.length()+1)) ) ;
> srcPortN = new Text(
> line.substring(pos+1,line.indexOf("|",pos+1)) );
> pos = line.indexOf("|",pos+1);
> dstPortN = new Text(
> line.substring(pos+1,line.indexOf("|",pos+1)) );
> if(srcIP.equals(srcIPN) && dstIP.equals(dstIPN))
> {
> int tmp, tmp2;
> tmp = Integer.parseInt(srcPort.toString()) -
> Integer.parseInt(srcPortN.toString());
> if(tmp<0)
> tmp*=-1;
> tmp2 = Integer.parseInt(dstPort.toString()) -
> Integer.parseInt(dstPortN.toString());
> if(tmp2<0)
> tmp2*=-1;
> temp=tmp+tmp2;
> if(count[4] > temp)
> {
> count[4] = temp;
> lineIndex[4]=lineno;
> }
> for(int k=0;k<5;k++)
> {
> for(int j=0;j<4;j++)
> {
> if(count[j] > count[j+1])
> {
> int temp2 = count[j+1];
> count[j+1] = count[j];
> count[j] = temp2;
> int temp3 = lineIndex[j+1];
> lineIndex[j+1] = lineIndex[j];
> lineIndex[j] = temp3;
> }
> }
> }
> }
> if ((line = br.readLine()) != null )
> {
> lineno++;
> continue;
> }
> else
> bool = false;
> }
> }
> br.close();
> counter1 = new Text(count[0]+" "+lineIndex[0]+":"+ddos_line);
> counter2 = new Text(count[1]+" "+lineIndex[1]+":"+ddos_line);
> counter3 = new Text(count[2]+" "+lineIndex[2]+":"+ddos_line);
> counter4 = new Text(count[3]+" "+lineIndex[3]+":"+ddos_line);
> counter5 = new Text(count[4]+" "+lineIndex[4]+":"+ddos_line);
> output.collect(srcIP, one);
> output.collect(dstIP, two);
> output.collect(srcPort, three);
> output.collect(dstPort, four);
> output.collect(counter1, five);
> output.collect(counter2, six);
> output.collect(counter3, seven);
> output.collect(counter4, eight);
> output.collect(counter5, nine);
> // output.collect(total_records, total);
> //iterating through all the words available in that line and forming
> the key value pair
> }
> {code}
> Kindly mention as to what is the reason behind this anomaly.
> P.S There are no issues with the configuration of the multinode hadoop
> cluster.
> Edit: I would like to explain what I am doing in this mapper class. I am
> having a 100KB file of normal flow record data which contains 1000 flows.
> There is another flow record of 100MB which contains 1,000,000 flows in it.
> For every flow from the 100MB file, I am checking(comparing the src IP's,
> port no.s and the Dst IP's and port no.s) with all of the flows from the
> 100KB file(to select the closest five flows from the 100KB file for every
> flow from the 100MB file). Thus, I am performing a total of 1000*1,000,000
> similarity check operations. I would like to further stress that both of
> these files are stored in HDFS and not local system. Kindly suggest as to
> what is wrong with the code.
> Thanks
> Nicolewells
>
>
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