org.apache.spark.storage

BlockObjectWriter

abstract class BlockObjectWriter extends AnyRef

An interface for writing JVM objects to some underlying storage. This interface allows appending data to an existing block, and can guarantee atomicity in the case of faults as it allows the caller to revert partial writes.

This interface does not support concurrent writes.

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  1. BlockObjectWriter
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Instance Constructors

  1. new BlockObjectWriter(blockId: BlockId)

Abstract Value Members

  1. abstract def close(): Unit

  2. abstract def commit(): Long

    Flush the partial writes and commit them as a single atomic block.

    Flush the partial writes and commit them as a single atomic block. Return the number of bytes written for this commit.

  3. abstract def fileSegment(): FileSegment

    Returns the file segment of committed data that this Writer has written.

  4. abstract def isOpen: Boolean

  5. abstract def open(): BlockObjectWriter

  6. abstract def revertPartialWrites(): Unit

    Reverts writes that haven't been flushed yet.

    Reverts writes that haven't been flushed yet. Callers should invoke this function when there are runtime exceptions.

  7. abstract def timeWriting(): Long

    Cumulative time spent performing blocking writes, in ns.

  8. abstract def write(value: Any): Unit

    Writes an object.

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

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  3. final def ##(): Int

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  6. final def asInstanceOf[T0]: T0

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  7. val blockId: BlockId

  8. def clone(): AnyRef

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