org.apache.lucene.benchmark.byTask.tasks
Class DeleteByPercentTask

java.lang.Object
  org.apache.lucene.benchmark.byTask.tasks.PerfTask
      org.apache.lucene.benchmark.byTask.tasks.DeleteByPercentTask

All Implemented Interfaces:

Cloneable

public class DeleteByPercentTask
extends PerfTask

Deletes a percentage of documents from an index randomly over the number of documents. The parameter, X, is in percent. EG 50 means 1/2 of all documents will be deleted.

NOTE: the param is an absolute percentage of maxDoc(). This means if you delete 50%, and then delete 50% again, the 2nd delete will do nothing.

Parameters:

• delete.percent.rand.seed - defines the seed to initialize Random (default 1717)

Field Summary

Fields inherited from class org.apache.lucene.benchmark.byTask.tasks.PerfTask

logStep, NEW_LINE, params, stopNow

Constructor Summary

DeleteByPercentTask(PerfRunData runData)

Method Summary

int	doLogic() Perform the task once (ignoring repetitions specification) Return number of work items done by this task.
void	setParams(String params) Set the params of this task.
void	setup() Task setup work that should not be measured for that specific task.
boolean	supportsParams() Sub classes that support parameters must override this method to return true.

Methods inherited from class org.apache.lucene.benchmark.byTask.tasks.PerfTask

clone, close, getBackgroundDeltaPriority, getDepth, getLogMessage, getName, getParams, getRunData, getRunInBackground, isDisableCounting, runAndMaybeStats, setDepth, setDisableCounting, setName, setRunInBackground, shouldNeverLogAtStart, shouldNotRecordStats, stopNow, tearDown, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DeleteByPercentTask

public DeleteByPercentTask(PerfRunData runData)

Method Detail

setup

public void setup()
           throws Exception

Description copied from class: PerfTask

Task setup work that should not be measured for that specific task. By default it does nothing, but tasks can implement this, moving work from PerfTask.doLogic() to this method. Only the work done in PerfTask.doLogic() is measured for this task. Notice that higher level (sequence) tasks containing this task would then measure larger time than the sum of their contained tasks.

Overrides:

setup in class PerfTask

Throws:

Exception

setParams

public void setParams(String params)

Description copied from class: PerfTask

Set the params of this task.

Overrides:

setParams in class PerfTask

supportsParams

public boolean supportsParams()

Description copied from class: PerfTask

Sub classes that support parameters must override this method to return true.

Overrides:

supportsParams in class PerfTask

Returns:

true iff this task supports command line params.

doLogic

public int doLogic()
            throws Exception

Description copied from class: PerfTask

Perform the task once (ignoring repetitions specification) Return number of work items done by this task. For indexing that can be number of docs added. For warming that can be number of scanned items, etc.

Specified by:

doLogic in class PerfTask

Returns:

number of work items done by this task.

Throws:

Exception