cascading.flow
Class FlowProps

java.lang.Object
  extended by cascading.property.Props
      extended by cascading.flow.FlowProps

public class FlowProps
extends Props

Class FlowProps is a fluent helper class for setting Flow specific properties through a FlowConnector.

See Also:
AppProps, CascadeProps, FlowConnectorProps

Field Summary
static String DEFAULT_ELEMENT_COMPARATOR
           
static String JOB_POLLING_INTERVAL
           
static String MAX_CONCURRENT_STEPS
           
static String PRESERVE_TEMPORARY_FILES
           
static String STOP_JOBS_ON_EXIT
           
 
Constructor Summary
FlowProps()
           
 
Method Summary
protected  void addPropertiesTo(Properties properties)
           
 String getDefaultTupleElementComparator()
           
 int getJobPollingInterval()
           
 int getMaxConcurrentSteps()
           
 boolean isPreserveTemporaryFiles()
           
 boolean isStopJobsOnExit()
           
static void setDefaultTupleElementComparator(Map<Object,Object> properties, String className)
          Sets a default Comparator to be used if no Comparator can be found for the class via the Comparison interface.
 FlowProps setDefaultTupleElementComparator(String defaultTupleElementComparator)
           
 FlowProps setJobPollingInterval(int jobPollingInterval)
           
static void setJobPollingInterval(Map<Object,Object> properties, long interval)
          Property jobPollingInterval will set the time to wait between polling the remote server for the status of a job.
 FlowProps setMaxConcurrentSteps(int maxConcurrentSteps)
           
static void setMaxConcurrentSteps(Map<Object,Object> properties, int numConcurrentSteps)
          Method setMaxConcurrentSteps sets the maximum number of steps that a Flow can run concurrently.
 FlowProps setPreserveTemporaryFiles(boolean preserveTemporaryFiles)
           
static void setPreserveTemporaryFiles(Map<Object,Object> properties, boolean preserveTemporaryFiles)
          Property preserveTemporaryFiles forces the Flow instance to keep any temporary intermediate data sets.
 FlowProps setStopJobsOnExit(boolean stopJobsOnExit)
           
static void setStopJobsOnExit(Map<Object,Object> properties, boolean stopJobsOnExit)
          Property stopJobsOnExit will tell the Flow to add a JVM shutdown hook that will kill all running processes if the underlying computing system supports it.
 
Methods inherited from class cascading.property.Props
buildProperties, buildProperties, buildProperties, buildProperties, setProperties, setProperties
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DEFAULT_ELEMENT_COMPARATOR

public static final String DEFAULT_ELEMENT_COMPARATOR
See Also:
Constant Field Values

PRESERVE_TEMPORARY_FILES

public static final String PRESERVE_TEMPORARY_FILES
See Also:
Constant Field Values

JOB_POLLING_INTERVAL

public static final String JOB_POLLING_INTERVAL
See Also:
Constant Field Values

MAX_CONCURRENT_STEPS

public static final String MAX_CONCURRENT_STEPS
See Also:
Constant Field Values

STOP_JOBS_ON_EXIT

public static final String STOP_JOBS_ON_EXIT
See Also:
Constant Field Values
Constructor Detail

FlowProps

public FlowProps()
Method Detail

setDefaultTupleElementComparator

public static void setDefaultTupleElementComparator(Map<Object,Object> properties,
                                                    String className)
Sets a default Comparator to be used if no Comparator can be found for the class via the Comparison interface.

In the case of Hadoop, if the Comparator instance also implements Configurable, the Configurable will be called.

In local mode, only the default constructor will be called for the comparator.

Parameters:
properties -
className -

setPreserveTemporaryFiles

public static void setPreserveTemporaryFiles(Map<Object,Object> properties,
                                             boolean preserveTemporaryFiles)
Property preserveTemporaryFiles forces the Flow instance to keep any temporary intermediate data sets. Useful for debugging. Defaults to false.

Parameters:
properties - of type Map
preserveTemporaryFiles - of type boolean

setJobPollingInterval

public static void setJobPollingInterval(Map<Object,Object> properties,
                                         long interval)
Property jobPollingInterval will set the time to wait between polling the remote server for the status of a job. The default value is 5000 msec (5 seconds).

Parameters:
properties - of type Map
interval - of type long

setMaxConcurrentSteps

public static void setMaxConcurrentSteps(Map<Object,Object> properties,
                                         int numConcurrentSteps)
Method setMaxConcurrentSteps sets the maximum number of steps that a Flow can run concurrently.

By default a Flow will attempt to run all give steps at the same time. But there are occasions where limiting the number of steps helps manages resources.

Parameters:
properties - of type Map
numConcurrentSteps - of type int

setStopJobsOnExit

public static void setStopJobsOnExit(Map<Object,Object> properties,
                                     boolean stopJobsOnExit)
Property stopJobsOnExit will tell the Flow to add a JVM shutdown hook that will kill all running processes if the underlying computing system supports it. Defaults to true.

Parameters:
properties - of type Map
stopJobsOnExit - of type boolean

getDefaultTupleElementComparator

public String getDefaultTupleElementComparator()

setDefaultTupleElementComparator

public FlowProps setDefaultTupleElementComparator(String defaultTupleElementComparator)

isPreserveTemporaryFiles

public boolean isPreserveTemporaryFiles()

setPreserveTemporaryFiles

public FlowProps setPreserveTemporaryFiles(boolean preserveTemporaryFiles)

getJobPollingInterval

public int getJobPollingInterval()

setJobPollingInterval

public FlowProps setJobPollingInterval(int jobPollingInterval)

getMaxConcurrentSteps

public int getMaxConcurrentSteps()

setMaxConcurrentSteps

public FlowProps setMaxConcurrentSteps(int maxConcurrentSteps)

isStopJobsOnExit

public boolean isStopJobsOnExit()

setStopJobsOnExit

public FlowProps setStopJobsOnExit(boolean stopJobsOnExit)

addPropertiesTo

protected void addPropertiesTo(Properties properties)
Specified by:
addPropertiesTo in class Props


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