public void copyFilesToLocal(int i) throws InterruptedException {
Process p;
BufferedReader brb;
String s;
try {
p =
Runtime.getRuntime()
.exec(
"hadoop fs -copyToLocal /user/cloudera/Index_"
+ i
+ "/indexFile"
+ i
+ " /home/cloudera/Desktop/datasets/IndexFiles");
brb = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((s = brb.readLine()) != null) {
System.out.println(s);
p.waitFor();
// System.out.println("exit: "+p.exitValue());
// p.destroy();
}
p.destroy();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(i + " File Copied to local indexFile folder from HDFS..");
}
public void mergeFiles(int noOfIndices) throws IOException, InterruptedException {
System.out.println("Index file merge program...");
Process p;
String s;
BufferedReader br;
String dir = "/home/cloudera/Desktop/datasets/IndexFiles";
System.out.println("Deleting all the exisitng file from local indexFile directory..");
deleteLocalIndexFiles(dir);
for (int i = 1; i <= noOfIndices; i++) {
p =
Runtime.getRuntime()
.exec(
"hadoop fs -mv /user/cloudera/Index_"
+ i
+ "/part* /user/cloudera/Index_"
+ i
+ "/indexFile"
+ i);
br = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((s = br.readLine()) != null) {
System.out.println(s);
p.waitFor();
}
p.destroy();
copyFilesToLocal(i);
}
mergeFilesOnLocal(dir, noOfIndices);
MainIndexTableInput mti = new MainIndexTableInput();
mti.createMainIndexFile("/home/cloudera/Desktop/datasets/IndexFiles/MergedOne");
}
public void mergeFilesOnLocal(String dir, int noOfIndices) throws InterruptedException {
ArrayList<String> ls = new ArrayList();
ls.add("cat");
for (int i = 1; i <= noOfIndices; i++) {
ls.add(dir + "/indexFile" + i + "");
}
try {
ProcessBuilder builder = new ProcessBuilder(ls);
File combineFile = new File("/home/cloudera/Desktop/datasets/IndexFiles/MergedOne");
builder.redirectOutput(combineFile);
builder.redirectError(combineFile);
Process p = builder.start();
p.waitFor();
} catch (IOException e) {
System.out.println(e.getMessage());
}
System.out.println("Newly copied index files are Merged as one index file...");
}