c

geotrellis.spark.io.accumulo

SocketWriteStrategy

case class SocketWriteStrategy(config: BatchWriterConfig = ..., threads: Int = ...) extends AccumuloWriteStrategy with Product with Serializable

This strategy will create one BatchWriter per partition and attempt to stream the records to the target tablets. In order to gain some parallism this strategy will create a number of splits in the target table equal to the number of tservers in the cluster. This is suitable for smaller ingests, or where HdfsWriteStrategy is otherwise not possible.

This strategy will not create splits before starting to write. If you wish to do that use AccumuloUtils.getSplits first.

There is a problem in Accumulo 1.6 (fixed in 1.7) where the split creation does not wait for the resulting empty tablets to distribute through the cluster before returning. This will create a warm-up period where the pressure the ingest writers on that node will delay tablet re-balancing.

The speed of the ingest can be improved by setting tserver.wal.sync.method=hflush in accumulo shell. Note: this introduces higher chance of data loss due to sudden node failure.

BatchWriter is notified of the tablet migrations and will follow them around the cluster.

config

Configuration for the BatchWriters

Linear Supertypes
Serializable, Serializable, Product, Equals, AccumuloWriteStrategy, AnyRef, Any
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  1. SocketWriteStrategy
  2. Serializable
  3. Serializable
  4. Product
  5. Equals
  6. AccumuloWriteStrategy
  7. AnyRef
  8. Any
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Instance Constructors

  1. new SocketWriteStrategy(config: BatchWriterConfig = ..., threads: Int = ...)

    config

    Configuration for the BatchWriters

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  6. val config: BatchWriterConfig
  7. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  8. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  9. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  10. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  11. val kwConfig: KryoWrapper[BatchWriterConfig]
  12. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  13. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  14. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  15. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  16. val threads: Int
  17. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  18. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  19. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  20. def write(kvPairs: RDD[(Key, Value)], instance: AccumuloInstance, table: String): Unit
    Definition Classes
    SocketWriteStrategy → AccumuloWriteStrategy

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AccumuloWriteStrategy

Inherited from AnyRef

Inherited from Any

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