org.apache.sysds.runtime.controlprogram.context

## Class SparkExecutionContext

- java.lang.Object
- - org.apache.sysds.runtime.controlprogram.context.ExecutionContext
  - - org.apache.sysds.runtime.controlprogram.context.SparkExecutionContext

-     public class SparkExecutionContext
      extends ExecutionContext

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `SparkExecutionContext.SparkClusterConfig` Captures relevant spark cluster configuration properties, e.g., memory budgets and degree of parallelism.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static boolean` | `FAIR_SCHEDULER_MODE`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addLineage(String varParent, String varChild, boolean broadcast)`
    `void` | `addLineageBroadcast(String varParent, String varChild)` Adds a child broadcast object to the lineage of a parent rdd.
    `void` | `addLineageRDD(String varParent, String varChild)` Adds a child rdd object to the lineage of a parent rdd.
    `org.apache.spark.broadcast.Broadcast<CacheBlock>` | `broadcastVariable(CacheableData<CacheBlock> cd)`
    `void` | `cacheMatrixObject(String var)`
    `static void` | `cleanupBroadcastVariable(org.apache.spark.broadcast.Broadcast<?> bvar)` This call destroys a broadcast variable at all executors and the driver.
    `void` | `cleanupCacheableData(CacheableData<?> mo)`
    `static void` | `cleanupRDDVariable(org.apache.spark.api.java.JavaPairRDD<?,?> rvar)` This call removes an rdd variable from executor memory and disk if required.
    `void` | `cleanupThreadLocalSchedulerPool(int pool)`
    `void` | `close()`
    `static org.apache.spark.SparkConf` | `createSystemDSSparkConf()` Sets up a SystemDS-preferred Spark configuration based on the implicit default configuration (as passed via configurations from outside).
    `org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock>` | `getBinaryMatrixBlockRDDHandleForVariable(String varname)` Spark instructions should call this for all matrix inputs except broadcast variables.
    `org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock>` | `getBinaryMatrixBlockRDDHandleForVariable(String varname, int numParts, boolean inclEmpty)`
    `org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock>` | `getBinaryTensorBlockRDDHandleForVariable(String varname)` Spark instructions should call this for all tensor inputs except broadcast variables.
    `org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock>` | `getBinaryTensorBlockRDDHandleForVariable(String varname, int numParts, boolean inclEmpty)`
    `PartitionedBroadcast<FrameBlock>` | `getBroadcastForFrameVariable(String varname)`
    `PartitionedBroadcast<MatrixBlock>` | `getBroadcastForMatrixObject(MatrixObject mo)`
    `PartitionedBroadcast<TensorBlock>` | `getBroadcastForTensorObject(TensorObject to)`
    `PartitionedBroadcast<TensorBlock>` | `getBroadcastForTensorVariable(String varname)`
    `PartitionedBroadcast<MatrixBlock>` | `getBroadcastForVariable(String varname)`
    `static double` | `getBroadcastMemoryBudget()` Obtains the available memory budget for broadcast variables in bytes.
    `static double` | `getDataMemoryBudget(boolean min, boolean refresh)` Obtain the available memory budget for data storage in bytes.
    `static int` | `getDefaultParallelism(boolean refresh)` Obtain the default degree of parallelism (cores in the cluster).
    `org.apache.spark.api.java.JavaPairRDD<Long,FrameBlock>` | `getFrameBinaryBlockRDDHandleForVariable(String varname)` Spark instructions should call this for all frame inputs except broadcast variables.
    `static int` | `getNumExecutors()` Obtain the number of executors in the cluster (excluding the driver).
    `org.apache.spark.api.java.JavaPairRDD<?,?>` | `getRDDHandleForFrameObject(FrameObject fo, Types.FileFormat fmt)` FIXME: currently this implementation assumes matrix representations but frame signature in order to support the old transform implementation.
    `org.apache.spark.api.java.JavaPairRDD<?,?>` | `getRDDHandleForMatrixObject(MatrixObject mo, Types.FileFormat fmt)`
    `org.apache.spark.api.java.JavaPairRDD<?,?>` | `getRDDHandleForMatrixObject(MatrixObject mo, Types.FileFormat fmt, int numParts, boolean inclEmpty)`
    `org.apache.spark.api.java.JavaPairRDD<?,?>` | `getRDDHandleForTensorObject(TensorObject to, Types.FileFormat fmt, int numParts, boolean inclEmpty)`
    `org.apache.spark.api.java.JavaPairRDD<?,?>` | `getRDDHandleForVariable(String varname, Types.FileFormat fmt, int numParts, boolean inclEmpty)`
    `static SparkExecutionContext.SparkClusterConfig` | `getSparkClusterConfig()` Obtains the lazily analyzed spark cluster configuration.
    `org.apache.spark.api.java.JavaSparkContext` | `getSparkContext()` Returns the used singleton spark context.
    `static org.apache.spark.api.java.JavaSparkContext` | `getSparkContextStatic()`
    `static boolean` | `isLazySparkContextCreation()`
    `static boolean` | `isLocalMaster()`
    `boolean` | `isRDDCached(int rddID)`
    `static boolean` | `isSparkContextCreated()` Indicates if the spark context has been created or has been passed in from outside.
    `void` | `repartitionAndCacheMatrixObject(String var)`
    `static void` | `resetSparkContextStatic()`
    `void` | `setRDDHandleForVariable(String varname, org.apache.spark.api.java.JavaPairRDD<?,?> rdd)` Keep the output rdd of spark rdd operations as meta data of matrix/frame objects in the symbol table.
    `int` | `setThreadLocalSchedulerPool()`
    `static FrameBlock` | `toFrameBlock(org.apache.spark.api.java.JavaPairRDD<Long,FrameBlock> rdd, Types.ValueType[] schema, int rlen, int clen)`
    `static FrameBlock` | `toFrameBlock(RDDObject rdd, Types.ValueType[] schema, int rlen, int clen)`
    `static org.apache.spark.api.java.JavaPairRDD<Long,FrameBlock>` | `toFrameJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc, FrameBlock src)`
    `static MatrixBlock` | `toMatrixBlock(org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock> rdd, int rlen, int clen, int blen, long nnz)` Utility method for creating a single matrix block out of a binary block RDD.
    `static MatrixBlock` | `toMatrixBlock(org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixCell> rdd, int rlen, int clen, long nnz)` Utility method for creating a single matrix block out of a binary cell RDD.
    `static MatrixBlock` | `toMatrixBlock(RDDObject rdd, int rlen, int clen, int blen, long nnz)` This method is a generic abstraction for calls from the buffer pool.
    `static MatrixBlock` | `toMatrixBlock(RDDObject rdd, int rlen, int clen, long nnz)`
    `static org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock>` | `toMatrixJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc, MatrixBlock src, int blen)`
    `static org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock>` | `toMatrixJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc, MatrixBlock src, int blen, int numParts, boolean inclEmpty)`
    `static PartitionedBlock<MatrixBlock>` | `toPartitionedMatrixBlock(org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock> rdd, int rlen, int clen, int blen, long nnz)`
    `static TensorBlock` | `toTensorBlock(org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock> rdd, DataCharacteristics dc)`
    `static org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock>` | `toTensorJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc, TensorBlock src, int blen)`
    `static org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock>` | `toTensorJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc, TensorBlock src, int blen, int numParts, boolean inclEmpty)`
    `static void` | `writeFrameRDDtoHDFS(RDDObject rdd, String path, Types.FileFormat fmt)`
    `static long` | `writeMatrixRDDtoHDFS(RDDObject rdd, String path, Types.FileFormat fmt)`

    - ### Methods inherited from class org.apache.sysds.runtime.controlprogram.context.ExecutionContext

      `allocateGPUMatrixObject, cleanupDataObject, containsVariable, containsVariable, createCacheableData, createFrameObject, createMatrixObject, getCacheableData, getCacheableData, getDataCharacteristics, getDenseMatrixOutputForGPUInstruction, getFrameInput, getFrameObject, getFrameObject, getGPUContext, getGPUContexts, getLineage, getLineageItem, getListObject, getListObject, getMatrixInput, getMatrixInputForGPUInstruction, getMatrixInputs, getMatrixInputs, getMatrixObject, getMatrixObject, getMetaData, getNumGPUContexts, getOrCreateLineageItem, getProgram, getScalarInput, getScalarInput, getScalarInputs, getSparseMatrixOutputForGPUInstruction, getTensorInput, getTensorObject, getTID, getVariable, getVariable, getVariables, getVarList, getVarListPartitioned, isAutoCreateVars, isFrameObject, isMatrixObject, pinVariables, releaseCacheableData, releaseFrameInput, releaseMatrixInput, releaseMatrixInput, releaseMatrixInputForGPUInstruction, releaseMatrixInputs, releaseMatrixInputs, releaseMatrixOutputForGPUInstruction, releaseTensorInput, releaseTensorInput, removeVariable, setAutoCreateVars, setFrameOutput, setGPUContexts, setLineage, setMatrixOutput, setMatrixOutput, setMetaData, setMetaData, setProgram, setScalarOutput, setTensorOutput, setTID, setVariable, setVariables, toString, traceLineage, unpinVariables`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### FAIR_SCHEDULER_MODE

          public static final boolean FAIR_SCHEDULER_MODE

      See Also:
        Constant Field Values

  - ### Method Detail

    - #### getSparkContext

          public org.apache.spark.api.java.JavaSparkContext getSparkContext()

      Returns the used singleton spark context. In case of lazy spark context creation, this methods blocks until the spark context is created.
      Returns:
        java spark context

    - #### getSparkContextStatic

          public static org.apache.spark.api.java.JavaSparkContext getSparkContextStatic()

    - #### isSparkContextCreated

          public static boolean isSparkContextCreated()

      Indicates if the spark context has been created or has been passed in from outside.
      Returns:
        true if spark context created

    - #### resetSparkContextStatic

          public static void resetSparkContextStatic()

    - #### close

          public void close()

    - #### isLazySparkContextCreation

          public static boolean isLazySparkContextCreation()

    - #### createSystemDSSparkConf

          public static org.apache.spark.SparkConf createSystemDSSparkConf()

      Sets up a SystemDS-preferred Spark configuration based on the implicit default configuration (as passed via configurations from outside).
      Returns:
        spark configuration

    - #### isLocalMaster

          public static boolean isLocalMaster()

    - #### getBinaryMatrixBlockRDDHandleForVariable

          public org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock> getBinaryMatrixBlockRDDHandleForVariable(String varname)

      Spark instructions should call this for all matrix inputs except broadcast variables.
      Parameters:
        `varname` - variable name
      Returns:
        JavaPairRDD of MatrixIndexes-MatrixBlocks

    - #### getBinaryMatrixBlockRDDHandleForVariable

          public org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock> getBinaryMatrixBlockRDDHandleForVariable(String varname,
                                                                                                                           int numParts,
                                                                                                                           boolean inclEmpty)

    - #### getBinaryTensorBlockRDDHandleForVariable

          public org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock> getBinaryTensorBlockRDDHandleForVariable(String varname)

      Spark instructions should call this for all tensor inputs except broadcast variables.
      Parameters:
        `varname` - variable name
      Returns:
        JavaPairRDD of TensorIndexes-HomogTensors

    - #### getBinaryTensorBlockRDDHandleForVariable

          public org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock> getBinaryTensorBlockRDDHandleForVariable(String varname,
                                                                                                                           int numParts,
                                                                                                                           boolean inclEmpty)

    - #### getFrameBinaryBlockRDDHandleForVariable

          public org.apache.spark.api.java.JavaPairRDD<Long,FrameBlock> getFrameBinaryBlockRDDHandleForVariable(String varname)

      Spark instructions should call this for all frame inputs except broadcast variables.
      Parameters:
        `varname` - variable name
      Returns:
        JavaPairRDD of Longs-FrameBlocks

    - #### getRDDHandleForVariable

          public org.apache.spark.api.java.JavaPairRDD<?,?> getRDDHandleForVariable(String varname,
                                                                                    Types.FileFormat fmt,
                                                                                    int numParts,
                                                                                    boolean inclEmpty)

    - #### getRDDHandleForMatrixObject

          public org.apache.spark.api.java.JavaPairRDD<?,?> getRDDHandleForMatrixObject(MatrixObject mo,
                                                                                        Types.FileFormat fmt)

    - #### getRDDHandleForMatrixObject

          public org.apache.spark.api.java.JavaPairRDD<?,?> getRDDHandleForMatrixObject(MatrixObject mo,
                                                                                        Types.FileFormat fmt,
                                                                                        int numParts,
                                                                                        boolean inclEmpty)

    - #### getRDDHandleForTensorObject

          public org.apache.spark.api.java.JavaPairRDD<?,?> getRDDHandleForTensorObject(TensorObject to,
                                                                                        Types.FileFormat fmt,
                                                                                        int numParts,
                                                                                        boolean inclEmpty)

    - #### getRDDHandleForFrameObject

          public org.apache.spark.api.java.JavaPairRDD<?,?> getRDDHandleForFrameObject(FrameObject fo,
                                                                                       Types.FileFormat fmt)

      FIXME: currently this implementation assumes matrix representations but frame signature in order to support the old transform implementation.
      Parameters:
        `fo` - frame object
        `fmt` - file format type
      Returns:
        JavaPairRDD handle for a frame object

    - #### broadcastVariable

          public org.apache.spark.broadcast.Broadcast<CacheBlock> broadcastVariable(CacheableData<CacheBlock> cd)

    - #### getBroadcastForMatrixObject

          public PartitionedBroadcast<MatrixBlock> getBroadcastForMatrixObject(MatrixObject mo)

    - #### getBroadcastForTensorObject

          public PartitionedBroadcast<TensorBlock> getBroadcastForTensorObject(TensorObject to)

    - #### getBroadcastForVariable

          public PartitionedBroadcast<MatrixBlock> getBroadcastForVariable(String varname)

    - #### getBroadcastForTensorVariable

          public PartitionedBroadcast<TensorBlock> getBroadcastForTensorVariable(String varname)

    - #### getBroadcastForFrameVariable

          public PartitionedBroadcast<FrameBlock> getBroadcastForFrameVariable(String varname)

    - #### setRDDHandleForVariable

          public void setRDDHandleForVariable(String varname,
                                              org.apache.spark.api.java.JavaPairRDD<?,?> rdd)

      Keep the output rdd of spark rdd operations as meta data of matrix/frame objects in the symbol table.
      Parameters:
        `varname` - variable name
        `rdd` - JavaPairRDD handle for variable

    - #### toMatrixJavaPairRDD

          public static org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock> toMatrixJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc,
                                                                                                             MatrixBlock src,
                                                                                                             int blen)

    - #### toMatrixJavaPairRDD

          public static org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock> toMatrixJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc,
                                                                                                             MatrixBlock src,
                                                                                                             int blen,
                                                                                                             int numParts,
                                                                                                             boolean inclEmpty)

    - #### toTensorJavaPairRDD

          public static org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock> toTensorJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc,
                                                                                                             TensorBlock src,
                                                                                                             int blen)

    - #### toTensorJavaPairRDD

          public static org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock> toTensorJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc,
                                                                                                             TensorBlock src,
                                                                                                             int blen,
                                                                                                             int numParts,
                                                                                                             boolean inclEmpty)

    - #### toFrameJavaPairRDD

          public static org.apache.spark.api.java.JavaPairRDD<Long,FrameBlock> toFrameJavaPairRDD(org.apache.spark.api.java.JavaSparkContext sc,
                                                                                                  FrameBlock src)

    - #### toMatrixBlock

          public static MatrixBlock toMatrixBlock(RDDObject rdd,
                                                  int rlen,
                                                  int clen,
                                                  int blen,
                                                  long nnz)

      This method is a generic abstraction for calls from the buffer pool.
      Parameters:
        `rdd` - rdd object
        `rlen` - number of rows
        `clen` - number of columns
        `blen` - block length
        `nnz` - number of non-zeros
      Returns:
        matrix block

    - #### toMatrixBlock

          public static MatrixBlock toMatrixBlock(org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock> rdd,
                                                  int rlen,
                                                  int clen,
                                                  int blen,
                                                  long nnz)

      Utility method for creating a single matrix block out of a binary block RDD. Note that this collect call might trigger execution of any pending transformations. NOTE: This is an unguarded utility function, which requires memory for both the output matrix and its collected, blocked representation.
      Parameters:
        `rdd` - JavaPairRDD for matrix block
        `rlen` - number of rows
        `clen` - number of columns
        `blen` - block length
        `nnz` - number of non-zeros
      Returns:
        matrix block

    - #### toMatrixBlock

          public static MatrixBlock toMatrixBlock(RDDObject rdd,
                                                  int rlen,
                                                  int clen,
                                                  long nnz)

    - #### toMatrixBlock

          public static MatrixBlock toMatrixBlock(org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixCell> rdd,
                                                  int rlen,
                                                  int clen,
                                                  long nnz)

      Utility method for creating a single matrix block out of a binary cell RDD. Note that this collect call might trigger execution of any pending transformations.
      Parameters:
        `rdd` - JavaPairRDD for matrix block
        `rlen` - number of rows
        `clen` - number of columns
        `nnz` - number of non-zeros
      Returns:
        matrix block

    - #### toTensorBlock

          public static TensorBlock toTensorBlock(org.apache.spark.api.java.JavaPairRDD<TensorIndexes,TensorBlock> rdd,
                                                  DataCharacteristics dc)

    - #### toPartitionedMatrixBlock

          public static PartitionedBlock<MatrixBlock> toPartitionedMatrixBlock(org.apache.spark.api.java.JavaPairRDD<MatrixIndexes,MatrixBlock> rdd,
                                                                               int rlen,
                                                                               int clen,
                                                                               int blen,
                                                                               long nnz)

    - #### toFrameBlock

          public static FrameBlock toFrameBlock(RDDObject rdd,
                                                Types.ValueType[] schema,
                                                int rlen,
                                                int clen)

    - #### toFrameBlock

          public static FrameBlock toFrameBlock(org.apache.spark.api.java.JavaPairRDD<Long,FrameBlock> rdd,
                                                Types.ValueType[] schema,
                                                int rlen,
                                                int clen)

    - #### writeMatrixRDDtoHDFS

          public static long writeMatrixRDDtoHDFS(RDDObject rdd,
                                                  String path,
                                                  Types.FileFormat fmt)

    - #### writeFrameRDDtoHDFS

          public static void writeFrameRDDtoHDFS(RDDObject rdd,
                                                 String path,
                                                 Types.FileFormat fmt)

    - #### addLineageRDD

          public void addLineageRDD(String varParent,
                                    String varChild)

      Adds a child rdd object to the lineage of a parent rdd.
      Parameters:
        `varParent` - parent variable
        `varChild` - child variable

    - #### addLineageBroadcast

          public void addLineageBroadcast(String varParent,
                                          String varChild)

      Adds a child broadcast object to the lineage of a parent rdd.
      Parameters:
        `varParent` - parent variable
        `varChild` - child variable

    - #### addLineage

          public void addLineage(String varParent,
                                 String varChild,
                                 boolean broadcast)

    - #### cleanupCacheableData

          public void cleanupCacheableData(CacheableData<?> mo)

      Overrides:
        `cleanupCacheableData` in class `ExecutionContext`

    - #### cleanupBroadcastVariable

          public static void cleanupBroadcastVariable(org.apache.spark.broadcast.Broadcast<?> bvar)

      This call destroys a broadcast variable at all executors and the driver. Hence, it is intended to be used on rmvar only. Depending on the ASYNCHRONOUS_VAR_DESTROY configuration, this is asynchronous or not.
      Parameters:
        `bvar` - broadcast variable

    - #### cleanupRDDVariable

          public static void cleanupRDDVariable(org.apache.spark.api.java.JavaPairRDD<?,?> rvar)

      This call removes an rdd variable from executor memory and disk if required. Hence, it is intended to be used on rmvar only. Depending on the ASYNCHRONOUS_VAR_DESTROY configuration, this is asynchronous or not.
      Parameters:
        `rvar` - rdd variable to remove

    - #### repartitionAndCacheMatrixObject

          public void repartitionAndCacheMatrixObject(String var)

    - #### cacheMatrixObject

          public void cacheMatrixObject(String var)

    - #### setThreadLocalSchedulerPool

          public int setThreadLocalSchedulerPool()

    - #### cleanupThreadLocalSchedulerPool

          public void cleanupThreadLocalSchedulerPool(int pool)

    - #### isRDDCached

          public boolean isRDDCached(int rddID)

    - #### getSparkClusterConfig

          public static SparkExecutionContext.SparkClusterConfig getSparkClusterConfig()

      Obtains the lazily analyzed spark cluster configuration.
      Returns:
        spark cluster configuration

    - #### getBroadcastMemoryBudget

          public static double getBroadcastMemoryBudget()

      Obtains the available memory budget for broadcast variables in bytes.
      Returns:
        broadcast memory budget

    - #### getDataMemoryBudget

          public static double getDataMemoryBudget(boolean min,
                                                   boolean refresh)

      Obtain the available memory budget for data storage in bytes.
      Parameters:
        `min` - flag for minimum data budget
        `refresh` - flag for refresh with spark context
      Returns:
        data memory budget

    - #### getNumExecutors

          public static int getNumExecutors()

      Obtain the number of executors in the cluster (excluding the driver).
      Returns:
        number of executors

    - #### getDefaultParallelism

          public static int getDefaultParallelism(boolean refresh)

      Obtain the default degree of parallelism (cores in the cluster).
      Parameters:
        `refresh` - flag for refresh with spark context
      Returns:
        default degree of parallelism

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