N/task Module
MapReduceScriptTaskStatus.getPendingOutputCount()
Method Description: Returns the total number of records or rows not yet processed by a task.MapReduceScriptTask.
Returns: number
Supported Script Types: Server scripts For more information, see SuiteScript 2.0 Script Types.
Governance: 10 units
Module: N/task Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=MapReduceScriptTaskStatus.getPendingOutputCount()

// Code Example 1

//Add additional code

//...

var summary = task.checkStatus(scriptTaskId);

var total = summary.getPendingOutputCount()

log.audit({

    title: 'Count',

    details: total

    });

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_453068786620.html