Examples of org.apache.hadoop.hbase.regionserver.CompoundConfiguration

Package org.apache.hadoop.hbase.regionserver

Examples of org.apache.hadoop.hbase.regionserver.CompoundConfiguration

org.apache.hadoop.hbase.regionserver.CompoundConfiguration
Do a shallow merge of multiple KV configuration pools. This is a very useful utility class to easily add per-object configurations in addition to wider scope settings. This is different from Configuration.addResource() functionality, which performs a deep merge and mutates the common data structure.
For clarity: the shallow merge allows the user to mutate either of the configuration objects and have changes reflected everywhere. In contrast to a deep merge, that requires you to explicitly know all applicable copies to propagate changes.
This class is package private because we expect significant refactoring here on the HBase side when certain HDFS changes are added & ubiquitous. Will revisit expanding access at that point. WARNING: The values set in the CompoundConfiguration are do not handle Property variable substitution. However, if they are set in the underlying configuration substitutions are done.

    baseConf.set("C", "3");
  }


  @Test
  public void testBasicFunctionality() throws ClassNotFoundException {
    CompoundConfiguration compoundConf = new CompoundConfiguration()
        .add(baseConf);
    assertEquals("1", compoundConf.get("A"));
    assertEquals(2, compoundConf.getInt("B", 0));
    assertEquals(3, compoundConf.getInt("C", 0));
    assertEquals(0, compoundConf.getInt("D", 0));


    assertEquals(CompoundConfiguration.class, compoundConf
        .getClassByName(CompoundConfiguration.class.getName()));
    try {
      compoundConf.getClassByName("bad_class_name");
      fail("Trying to load bad_class_name should throw an exception");
    } catch (ClassNotFoundException e) {
      // win!
    }
  }

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    Configuration conf = new Configuration();
    conf.set("B", "2b");
    conf.set("C", "33");
    conf.set("D", "4");


    CompoundConfiguration compoundConf = new CompoundConfiguration()
        .add(baseConf)
        .add(conf);
    assertEquals("1", compoundConf.get("A"));
    assertEquals("2b", compoundConf.get("B"));
    assertEquals(33, compoundConf.getInt("C", 0));
    assertEquals("4", compoundConf.get("D"));
    assertEquals(4, compoundConf.getInt("D", 0));
    assertNull(compoundConf.get("E"));
    assertEquals(6, compoundConf.getInt("F", 6));
  }

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    map.put(strToIbw("C"), strToIbw("33"));
    map.put(strToIbw("D"), strToIbw("4"));
    // unlike config, note that IBW Maps can accept null values
    map.put(strToIbw("G"), null);


    CompoundConfiguration compoundConf = new CompoundConfiguration()
      .add(baseConf)
      .add(map);
    assertEquals("1", compoundConf.get("A"));
    assertEquals("2b", compoundConf.get("B"));
    assertEquals(33, compoundConf.getInt("C", 0));
    assertEquals("4", compoundConf.get("D"));
    assertEquals(4, compoundConf.getInt("D", 0));
    assertNull(compoundConf.get("E"));
    assertEquals(6, compoundConf.getInt("F", 6));
    assertNull(compoundConf.get("G"));
  }

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Related Classes of org.apache.hadoop.hbase.regionserver.CompoundConfiguration

org.apache.hadoop.conf.Configuration

org.apache.hadoop.hbase.io.ImmutableBytesWritable

org.apache.hadoop.hbase.regionserver.TestCompoundConfiguration

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