/**
* Recover an unlinked tmp file on datanode restart. If the original block does not exist, then
* the tmp file is renamed to be the original file name and the original name is returned;
* otherwise the tmp file is deleted and null is returned.
*/
File recoverTempUnlinkedBlock(File unlinkedTmp) throws IOException {
File blockFile = FsDatasetUtil.getOrigFile(unlinkedTmp);
if (blockFile.exists()) {
// If the original block file still exists, then no recovery is needed.
if (!unlinkedTmp.delete()) {
throw new IOException("Unable to cleanup unlinked tmp file " + unlinkedTmp);
}
return null;
} else {
if (!unlinkedTmp.renameTo(blockFile)) {
throw new IOException("Unable to rename unlinked tmp file " + unlinkedTmp);
}
return blockFile;
}
}
