public class Partitioner_2 implements Partitioner<Text,Text>{
@Override
public int getPartition(Text key, Text value, int numPartitions) {
int hashValue=0;
for(char c: key.toString().split("\\|\\|")[0].toCharArray()){
hashValue+=(int)c;
}
return Math.abs(hashValue * 127) % numPartitions;
}
}
That is my partitioner code and the key is in the form:
"str1||str2" , I would like to send all keys that have the same value for str1 to the same reducer.
My GroupComparator and KeyComparator are as follows:
public static class GroupComparator_2 extends WritableComparator {
protected GroupComparator_2() {
super(Text.class, true);
}
@Override
public int compare(WritableComparable w1, WritableComparable w2) {
Text kw1 = (Text) w1;
Text kw2 = (Text) w2;
String k1=kw1.toString().split("||")[0].trim();
String k2=kw2.toString().split("||")[0].trim();
return k1.compareTo(k2);
}
}
public static class KeyComparator_2 extends WritableComparator {
protected KeyComparator_2() {
super(Text.class, true);
}
@Override
public int compare(WritableComparable w1, WritableComparable w2) {
Text key1 = (Text) w1;
Text key2 = (Text) w2;
String kw1_key1=key1.toString().split("||")[0];
String kw1_key2=key2.toString().split("||")[0];
int cmp=kw1_key1.compareTo(kw1_key2);
if(cmp==0){
String kw2_key1=key1.toString().split("||")[1].trim();
String kw2_key2=key2.toString().split("||")[1].trim();
cmp=kw2_key1.compareTo(kw2_key2);
}
return cmp;
}
}
The error I am currently receiving is :
KeywordKeywordCoOccurrence_2.java:92: interface expected here
public class Partitioner_2 implements Partitioner<Text,Text>{
^
KeywordKeywordCoOccurrence_2.java:94: method does not override or implement a method from a supertype
@Override
^
KeywordKeywordCoOccurrence_2.java:147: setPartitionerClass(java.lang.Class<? extends org.apache.hadoop.mapreduce.Partitioner>) in org.apache.hadoop.mapreduce.Job cannot be applied to (java.lang.Class<KeywordKeywordCoOccurrence_2.Partitioner_2>)
job.setPartitionerClass(Partitioner_2.class);
But as far as I can tell I have overridden the getPartition() method which is the only method in the Partitioner interface? Any help in identifying what I am doing wrong and how to fix it would be much appreciated.
Thanks in advance!
