/**
* Copy specified file into a temporary file. Then rename the temporary file to the original name.
* This will cause any hardlinks to the original file to be removed. The temporary files are
* created in the same directory. The temporary files will be recovered (especially on Windows) on
* datanode restart.
*/
private void unlinkFile(File file, Block b) throws IOException {
File tmpFile = DatanodeUtil.createTmpFile(b, DatanodeUtil.getUnlinkTmpFile(file));
try {
FileInputStream in = new FileInputStream(file);
try {
FileOutputStream out = new FileOutputStream(tmpFile);
try {
IOUtils.copyBytes(in, out, 16 * 1024);
} finally {
out.close();
}
} finally {
in.close();
}
if (file.length() != tmpFile.length()) {
throw new IOException(
"Copy of file "
+ file
+ " size "
+ file.length()
+ " into file "
+ tmpFile
+ " resulted in a size of "
+ tmpFile.length());
}
FileUtil.replaceFile(tmpFile, file);
} catch (IOException e) {
boolean done = tmpFile.delete();
if (!done) {
DataNode.LOG.info("detachFile failed to delete temporary file " + tmpFile);
}
throw e;
}
}
/**
* Get the full path of this replica's meta file
*
* @return the full path of this replica's meta file
*/
public File getMetaFile() {
return new File(getDir(), DatanodeUtil.getMetaName(getBlockName(), getGenerationStamp()));
}
