本文整理汇总了Java中org.apache.hadoop.mapreduce.task.annotation.Checkpointable类的典型用法代码示例。如果您正苦于以下问题：Java Checkpointable类的具体用法？Java Checkpointable怎么用？Java Checkpointable使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
Checkpointable类属于org.apache.hadoop.mapreduce.task.annotation包，在下文中一共展示了Checkpointable类的1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: cleanUpPartialOutputForTask
import org.apache.hadoop.mapreduce.task.annotation.Checkpointable; //导入依赖的package包/类
@Override
public void cleanUpPartialOutputForTask(TaskAttemptContext context)
throws IOException {
// we double check this is never invoked from a non-preemptable subclass.
// This should never happen, since the invoking codes is checking it too,
// but it is safer to double check. Errors handling this would produce
// inconsistent output.
if (!this.getClass().isAnnotationPresent(Checkpointable.class)) {
throw new IllegalStateException("Invoking cleanUpPartialOutputForTask() " +
"from non @Preemptable class");
}
FileSystem fs =
fsFor(getTaskAttemptPath(context), context.getConfiguration());
LOG.info("cleanUpPartialOutputForTask: removing everything belonging to " +
context.getTaskAttemptID().getTaskID() + " in: " +
getCommittedTaskPath(context).getParent());
final TaskAttemptID taid = context.getTaskAttemptID();
final TaskID tid = taid.getTaskID();
Path pCommit = getCommittedTaskPath(context).getParent();
// remove any committed output
for (int i = 0; i < taid.getId(); ++i) {
TaskAttemptID oldId = new TaskAttemptID(tid, i);
Path pTask = new Path(pCommit, oldId.toString());
if (fs.exists(pTask) && !fs.delete(pTask, true)) {
throw new IOException("Failed to delete " + pTask);
}
}
}