CODEWITHSUNDEEP
javahadoopworkflowoozie
Chirag
Chirag

Reputation: 351

reading a .properties file stored in hdfs using java code

i need to read .properties file which is available in the hdfs. i am using the below code but it throws a run time error.

FileSystem fs = FileSystem.get(config);

    Properties conf = wc.createConfiguration();
    Properties prop = new Properties();
    String appPath = "hdfs://clusterdb05.com:8020/user/cmahajan/" + version + "/apps/apps/";
    conf.setProperty(OozieClient.APP_PATH,appPath);
    FileInputStream f = new FileInputStream("hdfs://clusterdb05.com:8020/user/cmahajan/app.properties");
    ObjectInputStream f = new ObjectInputStream(fs.open(new Path("/user/cmahajan/app.properties")));

the run time error is :

LaunchJob.java:28: cannot find symbol

symbol  : class ObjectInputStream
location: class LaunchJob
    ObjectInputStream f = new ObjectInputStream(fs.open(new Path("/user/cmahajan/app.properties")));
    ^
LaunchJob.java:28: cannot find symbol
symbol  : class ObjectInputStream
location: class LaunchJob
    ObjectInputStream f = new ObjectInputStream(fs.open(new Path("/user/cmahajan/app.properties")));

Upvotes: 4

Views: 3937

Answers (2)

Mentya
Mentya

Reputation: 201

For loading properties file form hdfs:

  1. make sure ur core-site.xml,hdfs-site xml file path
  2. hdfs port no(it will available in core-site.xml)

  3. replace key in getProperty.

           String CURRENCIES_DIM1 = null;
       String DATES_DIM2 = null; 
       Configuration conf = new Configuration();
        conf.addResource(new Path("/usr/local/hadoop/etc/hadoop/core-site.xml"));
        conf.addResource(new Path("/usr/local/hadoop/etc/hadoop/hdfs-site.xml"));
        String filePath = "hdfs://localhost:54310/user/CurrencyCache.properties";
        Path path = new Path(filePath);
        FileSystem fs = path.getFileSystem(conf);
        try (FSDataInputStream currencyInputStream = fs.open(path)) {
            Properties currencyProp = new Properties();
            currencyProp.load(currencyInputStream);
            CURRENCIES_DIM1= currencyProp.getProperty("key");//getting the 'CURRENCIES_DIM' file path from properties file
            DATES_DIM2= currencyProp.getProperty("key");            //getting the 'DATES_DIM' file path from properties file

        } catch (IOException e) {

            e.printStackTrace();
        }
        fs.close();

Upvotes: 2

Azodious
Azodious

Reputation: 13882

Either use fully qualified name of class:

java.io.ObjectInputStream

OR

import the class using following line:

import java.io.ObjectInputStream;

Upvotes: 0

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