AvroDStreamMagnet

Magnet for operations on a DStream containing Avro records.

This is motivated by the fact that Avro records (ironically) don't implement the java.io.Serializable interface, which means that the only safe operations are those which cannot result in Spark trying to serialize the records.

For convenience, we provide two operations:

Extract a set of fields, specified by name. These are extracted to a scala.Seq[Option[AnyRef]] collection. 2. Convert to a io.divolte.spark.avro.Record.

K: the type of the decoded Kafka keys for each message.
V: the type of the deserialized Avro record.

Linear Supertypes

AnyRef, Any

Value Members

final def !=(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def !=(arg0: Any): Boolean

Definition Classes
Any
final def ##(): Int

Definition Classes
AnyRef → Any
final def ==(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def ==(arg0: Any): Boolean

Definition Classes
Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def fields(fieldNames: String*): DStream[(K, Seq[Option[Serializable]])]

Extract specific fields from an RDD of Avro records.
Extract specific fields from an RDD of Avro records.
This operation extracts specific fields from an RDD of Avro records. Field values are wrapped in an Option.
fieldNames
the names of the fields to extract
returns
a DStream of sequences containing the field values requested.
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
def mapValues[U <: Serializable](f: (V) ⇒ U)(implicit arg0: ClassTag[U]): DStream[(K, U)]

Extract serializable values from a DStream of Avro records.
Extract serializable values from a DStream of Avro records.
U
The (serializable) type of the value extracted from a record.
f
A function to extract the serializable values from a record.
returns
A DStream containing the extracted values.
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
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final def notifyAll(): Unit

Definition Classes
AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toRecords: DStream[(K, Record)]

View the DStream of Avro records as io.divolte.spark.avro.Record instances.
View the DStream of Avro records as io.divolte.spark.avro.Record instances.
This operation must perform a deep copy of the Avro record with conversions to ensure that everything can be serialized. If you only wish to access a small subset of the Avro record, it can be more efficient to extract the fields you need using AvroRDDMagnet#fields.
returns
a DStream of io.divolte.spark.avro.Record instances built from the Avro records.
def toString(): String

Definition Classes
AnyRef → Any
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
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Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
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Annotations
@throws( ... )

class AvroDStreamMagnet[K, +V >: Null <: IndexedRecord] extends AnyRef

Value Members

final def !=(arg0: AnyRef): Boolean

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: AnyRef): Boolean

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def fields(fieldNames: String*): DStream[(K, Seq[Option[Serializable]])]

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

def mapValues[U <: Serializable](f: (V) ⇒ U)(implicit arg0: ClassTag[U]): DStream[(K, U)]

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toRecords: DStream[(K, Record)]

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from AnyRef

Inherited from Any

Ungrouped