本文整理汇总了Java中org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory.getRemovedTmp方法的典型用法代码示例。如果您正苦于以下问题：Java StorageDirectory.getRemovedTmp方法的具体用法？Java StorageDirectory.getRemovedTmp怎么用？Java StorageDirectory.getRemovedTmp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.hdfs.server.common.Storage.StorageDirectory的用法示例。
在下文中一共展示了StorageDirectory.getRemovedTmp方法的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: doRollBack
import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory; //导入方法依赖的package包/类
/**
* Perform rollback of the storage dir to the previous state. The existing
* current dir is removed, and the previous dir is renamed to current.
*
* @param sd the storage directory to roll back.
* @throws IOException in the event of error
*/
static void doRollBack(StorageDirectory sd)
throws IOException {
File prevDir = sd.getPreviousDir();
if (!prevDir.exists()) {
return;
}
File tmpDir = sd.getRemovedTmp();
Preconditions.checkState(!tmpDir.exists(),
"removed.tmp directory must not exist for rollback."
+ "Consider restarting for recovery.");
// rename current to tmp
File curDir = sd.getCurrentDir();
Preconditions.checkState(curDir.exists(),
"Current directory must exist for rollback.");
NNStorage.rename(curDir, tmpDir);
// rename previous to current
NNStorage.rename(prevDir, curDir);
// delete tmp dir
NNStorage.deleteDir(tmpDir);
LOG.info("Rollback of " + sd.getRoot() + " is complete.");
}