本文整理汇总了Java中org.apache.hadoop.mapred.JobConf.getNumMapTasks方法的典型用法代码示例。如果您正苦于以下问题：Java JobConf.getNumMapTasks方法的具体用法？Java JobConf.getNumMapTasks怎么用？Java JobConf.getNumMapTasks使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类org.apache.hadoop.mapred.JobConf的用法示例。
在下文中一共展示了JobConf.getNumMapTasks方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: ShuffleSchedulerImpl
import org.apache.hadoop.mapred.JobConf; //导入方法依赖的package包/类
public ShuffleSchedulerImpl(JobConf job, TaskStatus status,
TaskAttemptID reduceId,
ExceptionReporter reporter,
Progress progress,
Counters.Counter shuffledMapsCounter,
Counters.Counter reduceShuffleBytes,
Counters.Counter failedShuffleCounter) {
totalMaps = job.getNumMapTasks();
abortFailureLimit = Math.max(30, totalMaps / 10);
copyTimeTracker = new CopyTimeTracker();
remainingMaps = totalMaps;
finishedMaps = new boolean[remainingMaps];
this.reporter = reporter;
this.status = status;
this.reduceId = reduceId;
this.progress = progress;
this.shuffledMapsCounter = shuffledMapsCounter;
this.reduceShuffleBytes = reduceShuffleBytes;
this.failedShuffleCounter = failedShuffleCounter;
this.startTime = Time.monotonicNow();
lastProgressTime = startTime;
referee.start();
this.maxFailedUniqueFetches = Math.min(totalMaps, 5);
this.maxFetchFailuresBeforeReporting = job.getInt(
MRJobConfig.SHUFFLE_FETCH_FAILURES, REPORT_FAILURE_LIMIT);
this.reportReadErrorImmediately = job.getBoolean(
MRJobConfig.SHUFFLE_NOTIFY_READERROR, true);
this.maxDelay = job.getLong(MRJobConfig.MAX_SHUFFLE_FETCH_RETRY_DELAY,
MRJobConfig.DEFAULT_MAX_SHUFFLE_FETCH_RETRY_DELAY);
this.maxHostFailures = job.getInt(
MRJobConfig.MAX_SHUFFLE_FETCH_HOST_FAILURES,
MRJobConfig.DEFAULT_MAX_SHUFFLE_FETCH_HOST_FAILURES);
}
示例2: limitNumMapTasks
import org.apache.hadoop.mapred.JobConf; //导入方法依赖的package包/类
/**
* Ensures that the given number of map tasks for the given job
* configuration does not exceed the number of regions for the given table.
*
* @param table The table to get the region count for.
* @param job The current job configuration to adjust.
* @throws IOException When retrieving the table details fails.
*/
// Used by tests.
public static void limitNumMapTasks(String table, JobConf job)
throws IOException {
int regions =
MetaTableAccessor.getRegionCount(HBaseConfiguration.create(job), TableName.valueOf(table));
if (job.getNumMapTasks() > regions)
job.setNumMapTasks(regions);
}