@Test
public void test() throws Exception {
final PartitionStrategy p =
new PartitionStrategy.Builder().identity("month", 12).hash("userId", 7).get();
List<FieldPartitioner> fieldPartitioners = p.getFieldPartitioners();
Assert.assertEquals(2, fieldPartitioners.size());
FieldPartitioner fp0 = fieldPartitioners.get(0);
assertEquals("month", fp0.getName());
assertEquals(12, fp0.getCardinality());
FieldPartitioner fp1 = fieldPartitioners.get(1);
assertEquals("userId", fp1.getName());
assertEquals(7, fp1.getCardinality());
Entity e = new Entity();
e.setMonth(2);
e.setUserId(10);
logger.debug("partitionStrategy:{}", p);
assertEquals(12 * 7, p.getCardinality()); // useful for writers
}
/**
* Precondition-style validation that the DatasetDescriptor is compatible.
*
* @param descriptor a {@link DatasetDescriptor}
*/
public static void checkDescriptor(DatasetDescriptor descriptor) {
Preconditions.checkNotNull(descriptor, "Descriptor cannot be null");
Schema schema = descriptor.getSchema();
checkSchema(schema);
if (descriptor.isPartitioned()) {
// marked as [BUG] because this is checked in DatasetDescriptor
Preconditions.checkArgument(
schema.getType() == Schema.Type.RECORD,
"[BUG] Partitioned datasets must have record schemas");
Set<String> names = Sets.newHashSet();
for (Schema.Field field : schema.getFields()) {
names.add(field.name());
}
List<String> incompatible = Lists.newArrayList();
List<String> duplicates = Lists.newArrayList();
for (FieldPartitioner fp : descriptor.getPartitionStrategy().getFieldPartitioners()) {
String name = fp.getName();
if (!isCompatibleName(name)) {
incompatible.add(name);
} else if (names.contains(name)) {
duplicates.add(name);
} else {
names.add(name);
}
}
Preconditions.checkState(
incompatible.isEmpty(),
"Hive incompatible: partition names are not alphanumeric (plus '_'): %s",
Joiner.on(", ").join(incompatible));
Preconditions.checkState(
duplicates.isEmpty(),
"Hive incompatible: partition names duplicate data fields: %s",
Joiner.on(", ").join(duplicates));
}
}