shark.memstore2

OffHeapStorageClient

abstract class OffHeapStorageClient extends AnyRef

Provides an API for writing to an off-heap storage service, such as Tachyon.

To ease the distinction between partitioned and non-partitioned tables, we consider a non-partitioned table as a special case of partitioned tables with the single hivePartitionKey of value None. See TachyonStorageClient.DEFAULT_PARTITION for example usage.

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TachyonStorageClient
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Instance Constructors

  1. new OffHeapStorageClient()

Abstract Value Members

  1. abstract def createTablePartition(tableKey: String, hivePartitionKeyOpt: Option[String]): Boolean

  2. abstract def createTablePartitionWriter(tableKey: String, hivePartitionKeyOpt: Option[String], numColumns: Int): OffHeapTableWriter

  3. abstract def dropTable(tableKey: String): Boolean

  4. abstract def dropTablePartition(tableKey: String, hivePartitionKey: Option[String]): Boolean

  5. abstract def readTablePartition(tableKey: String, hivePartitionKeyOpt: Option[String], columnsUsed: BitSet, pruningFn: (RDD[TablePartition], Map[Int, TablePartitionStats]) ⇒ RDD[_]): RDD[_]

    Reads a partition into an RDD, projecting columns and pruning rows to reduce total amount of data transferred out of the off-heap storage.

    Reads a partition into an RDD, projecting columns and pruning rows to reduce total amount of data transferred out of the off-heap storage. In order to facilitate the column projection, the RDD may return a TablePartition with null column ByteBuffers, which the row-pruning function will safely ignore.

  6. abstract def renameTable(oldTableKey: String, newTableKey: String): Boolean

  7. abstract def tableExists(tableKey: String): Boolean

  8. abstract def tablePartitionExists(tableKey: String, hivePartitionKey: Option[String]): Boolean

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