What is the reason of using the queue?
"job.getConfiguration().set("mapred.job.queue.name", "exp_dsa");"
Is your mapper or reducer even been called?
Try adding the override annotation to the map/reduce methods as below:
@Override
public void map(Object key, Text value, Context context) throws
IOException, InterruptedException {
Regards,
Shahab
On Tue, Mar 31, 2015 at 3:26 AM, bradford li <[email protected]> wrote:
> I'm not sure why my Mapper and Reducer have no output. The logic behind my
> code is, given a file of UUIDs (new line separated), I want to use
> `globStatus` to display all the paths to all potential files that the UUID
> might be in. Open and read the file. Each file contains 1-n lines of JSON.
> The UUID is in `event_header.event_id` in the JSON.
>
> Right now the MapReduce job runs without errors. However, something is
> wrong because I dont have any output. I'm not sure how to debug MapReduce
> jobs as well. If someone could provide me a source that would be awesome!
> The expected output from this program should be
>
> UUID_1 1
> UUID_2 1
> UUID_3 1
> UUID_4 1
> ...
> ...
> UUID_n 1
>
> In my logic, the output file should be the UUIDs with a 1 next to them
> because upon found, 1 is written, if not found 0 is written. They should be
> all 1's because I pulled the UUIDs from the source.
>
> My Reducer currently does not do anything except I just wanted to see if I
> could get some simple logic working. There are most likely bugs in my code
> as I dont know have a easy way to debug MapReduce jobs
>
> Driver:
>
> public class SearchUUID {
>
> public static void main(String[] args) throws Exception {
> Configuration conf = new Configuration();
> Job job = Job.getInstance(conf, "UUID Search");
> job.getConfiguration().set("mapred.job.queue.name",
> "exp_dsa");
> job.setJarByClass(SearchUUID.class);
> job.setMapperClass(UUIDMapper.class);
> job.setReducerClass(UUIDReducer.class);
> job.setOutputKeyClass(Text.class);
> job.setOutputValueClass(Text.class);
> FileInputFormat.addInputPath(job, new Path(args[0]));
> FileOutputFormat.setOutputPath(job, new Path(args[1]));
> System.exit(job.waitForCompletion(true) ? 0 : 1);
> }
> }
>
>
> UUIDMapper:
>
> public class UUIDMapper extends Mapper<Object, Text, Text, Text> {
> public void map(Object key, Text value, Context context) throws
> IOException, InterruptedException {
>
> try {
> Text one = new Text("1");
> Text zero = new Text("0");
>
> FileSystem fs = FileSystem.get(new Configuration());
> FileStatus[] paths = fs.globStatus(new
> Path("/data/path/to/file/d_20150330-1650"));
> for (FileStatus path : paths) {
> BufferedReader br = new BufferedReader(new
> InputStreamReader(fs.open(path.getPath())));
> String json_string = br.readLine();
> while (json_string != null) {
> JsonElement jelement = new
> JsonParser().parse(json_string);
> JsonObject jsonObject = jelement.getAsJsonObject();
> jsonObject =
> jsonObject.getAsJsonObject("event_header");
> jsonObject =
> jsonObject.getAsJsonObject("event_id");
>
> if
> (value.toString().equals(jsonObject.getAsString())) {
> System.out.println(value.toString() +
> "slkdjfksajflkjsfdkljsadfk;ljasklfjklasjfklsadl;sjdf");
> context.write(value, one);
> } else {
> context.write(value, zero);
> }
>
> json_string = br.readLine();
> }
> }
> } catch (IOException failed) {
> }
> }
> }
>
>
> Reducer:
>
> public class UUIDReducer extends Reducer<Text, Text, Text, Text>{
>
> public void reduce(Text key, Text value, Context context) throws
> IOException, InterruptedException{
> context.write(key, value);
> }
> }
>
>
