Sunday, 7 December 2014

Joining Two Files Using MultipleInput In Hadoop MapReduce - MapSide Join

There are cases where we need to get 2 files as input and join them based on id or something like that.
Two different large data can be joined in map reduce programming also. Joins in Map phase refers as Map side join, while join at reduce side called as reduce side join.  
MapSide can be achieved using MultipleInputFormat in Hadoop.

Say I have 2 files ,One file with EmployeeID,Name,Designation and another file with EmployeeID,Salary,Department.

File1.txt
1 Anne,Admin
2 Gokul,Admin
3 Janet,Sales
4 Hari,Admin

AND

File2.txt
1 50000,A
2 50000,B
3 60000,A
4 50000,C

We will try to join these files into one based on EmployeeID
The result we aim at is 

1 Anne,Admin,50000,A
2 Gokul,Admin,50000,B
3 Janet,Sales,60000,A
4 Hari,Admin,50000,C

Here in both file File1.txt,File2.txt we can see that we need to join the records based on id.  So the employeeId's are common.
We will write 2 map jobs to process these files.

Processing File1.txt
public void map(LongWritable k, Text value, Context context) throws IOException, InterruptedException
{
 String line=value.toString();
 String[] words=line.split("\t");
 keyEmit.set(words[0]);
 valEmit.set(words[1]);
 context.write(keyEmit, valEmit);
}

The above map job process File1.txt
String[] words=line.split("\t");
splits each line with \t space so words[0] will be the employeeId which we pass it as key and the rest as value.

eg: 1 Anne,Admin
words[0] = 1
words[1] = Anne,Admin

Or else you can also use KeyValueTextInputFormat.class as InputFormat. This class gives key as employeeId and the rest as value.
You dont need to split it.

Processing File2.txt
public void map(LongWritable k, Text v, Context context) throws IOException, InterruptedException
{
 String line=v.toString();
 String[] words=line.split(" ");
 keyEmit.set(words[0]);
 valEmit.set(words[1]);
 context.write(keyEmit, valEmit);
}

The above map job process File2.txt

eg: 1 50000,A
words[0] = 1
words[1] = 50000,A

If the files are of same delimiter and ID comes first you can resuse the same map job

Lets write a commomn Reducer task to join the data using key.
String merge = "";
public void reduce(Text key, Iterable<Text> values, Context context)
{
 int i =0;
 for(Text value:values)
 {
  if(i == 0){
   merge = value.toString()+",";
  }
  else{
   merge += value.toString();
  }
  i++;
 }
 valEmit.set(merge);
 context.write(key, valEmit);
}

Here we will be caching 1 data from a mapper and appends it to string "merge".
And emit employeeId as key and merge as value.

Now we need to furnish our Driver class to take 2 inputs and use MultipleInputFormat as InputFormat


public int run(String[] args) throws Exception {
 Configuration c=new Configuration();
 String[] files=new GenericOptionsParser(c,args).getRemainingArgs();
 Path p1=new Path(files[0]);
 Path p2=new Path(files[1]);
 Path p3=new Path(files[2]);
 FileSystem fs = FileSystem.get(c);
 if(fs.exists(p3)){
  fs.delete(p3, true);
  }
 Job job = new Job(c,"Multiple Job");
 job.setJarByClass(MultipleFiles.class);
 MultipleInputs.addInputPath(job, p1, TextInputFormat.class, MultipleMap1.class);
 MultipleInputs.addInputPath(job,p2, TextInputFormat.class, MultipleMap2.class);
 job.setReducerClass(MultipleReducer.class);
 .
 .
}

MultipleInputs.addInputPath(job, p1, TextInputFormat.class, MultipleMap1.class);
MultipleInputs.addInputPath(job,p2, TextInputFormat.class, MultipleMap2.class);
p1,p2 are the Path variable holding 2 input files.
You can find the code in Github

There is one more case where we can make our output in a sequential manner.
Say if we need to get the output as below
1 Anne,Admin,50000,A
2 Gokul,Admin,50000,B
3 Janet,Sales,60000,A
4 Hari,Admin,50000,C
Inorder to achieve the same we can make use of TextPair Writable concepts in Hadoop.
You can find the working code in github . Thanks to one of  my blog reader Ravi Kumar who sorted out the sequence in order.

142 comments:

  1. There are lots of information about hadoop have spread around the web, but this is a unique one according to me. The strategy you have updated here will make me to get to the next level in big data. Thanks for sharing this.


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  2. At hadoop online training center we came to know about more other technologies like netezza, redshift, ETL and ELT with in depth insights. Similarly this website helped me a lot for the supplementary knowledge on those topics. Thanks for the info...

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  3. Hi Thank you for the valuable inputs, I tried running the driver and I am getting output as below

    1 50000,A,Anne,Admin
    2 Gokul,Admin,50000,B
    3 60000,A,Janet,Sales
    4 Hari,Admin,50000,C

    but I need the sequential output i.e

    1 Anne,Admin,50000,A
    2 Gokul,Admin,50000,B
    3 Janet,Sales,60000,A
    4 Hari,Admin,50000,C

    could you please help me with this

    ReplyDelete
    Replies
    1. Hi Shaila
      Thanks for reading and trying out.
      Inorder to acheive the order you can make use of Text Pair concepts in Hadoop.

      Blog post is updated with working code.

      Delete
    2. could you specify about Text Pair please?

      Delete
    3. This comment has been removed by the author.

      Delete
    4. I solved this problem by some dummy method... just add the table number before the output value in the Mapper class, like
      in your 1st mapper class:
      outValue.set("1" + othCol.toString());
      context.write(primaryKey,outValue);

      in your 2nd mapper class:
      outValue.set("2" + othCol.toString());
      context.write(primaryKey,outValue);

      in your reducer class:
      StringBuilder stb1 = new StringBuilder();
      StringBuilder stb2 = new StringBuilder();
      for(Text t:valueIt){
      if (t.toString().substring(0, 1).equals("1")){
      stb1.append(t.toString().substring(1,t.getLength()));
      }
      else if(t.toString().substring(0, 1).equals("2")){
      stb2.append(t.toString().substring(1,t.getLength()));
      }
      }

      Delete
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  11. Hi brother i have large 2 dataset all line (0,tcp,http,SF,335,10440,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,6,7,0.00,0.00,0.00,0.00,1.00,0.00,0.29,27,255,1.00,0.00,0.04,0.08,0.00,0.00,0.00,0.00,normal) should i create 42 keyemit to combine those 2 dataset?

    ReplyDelete
    Replies
    1. Yes,You will experience performance delay. You can try joining files using hive aswell

      Delete
    2. thanks for replay, i keep your project and i just change in MultipleMap1 and MultipleMap2 number of keyemit (in my case should i create 42 keyemit) and it will join the 2 datasets?

      Delete
  12. Array Out of Bond when i try to run your example with large dataset, any solution please?

    ReplyDelete
    Replies
    1. Are you using array to store values in Reducer?

      Delete
    2. No i'm not using array i just used your code and i tried to run it with my dataset i got this error array out ofbond

      Delete
  13. May I ask you for next task. File1.txt
    --------------
    Admin,Anne
    Admin,Gokul
    Sales,Janet
    --------------
    File1.txt
    --------------
    Anne,100
    Gokul,200
    Janet,300
    --------------
    In third file we should aggregate per each Position their summary salary. In our case:
    --------------
    Admin,300
    Sales,300
    --------------
    What is workflow in this case? To use MapReduce twise?(

    ReplyDelete
  14. hey bigboss...put tabspace in u r input files ...instead of directly copypasting the file. like below
    1 Anne,Admin
    2 Gokul,Admin
    3 Janet,Sales
    4 Hari,Admin

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  17. Hi Unmesha,
    I have similar problem to be solved, but slightly more complicated.
    I have several file1s and file2s coming from different servers in productions.
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    file2.1.txt, file2.2.txt, file2.3.txt
    I have structured data in file1 and file 2 with few common columns in file1 and file2s.
    My questions are
    1) How will you define your Driver class? (can u use regular expression or something?).
    2) What happens, if on a given Hadoop instance/node, you have data as follows
    file1.txt
    1 sri,kon
    2 sai,kon

    file2.txt
    2 'kg'
    3 'pg'

    How will the map reduce prohram work? The file2 data for a corresponding key value in file1, may be on a different node? Vice versa.

    Thanks
    Sri

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