@Override
public void abandonBlock(ExtendedBlock b, long fileId, String src,
String holder) throws AccessControlException, FileNotFoundException,
UnresolvedLinkException, IOException {
AbandonBlockRequestProto req = AbandonBlockRequestProto.newBuilder()
.setB(PBHelper.convert(b)).setSrc(src).setHolder(holder)
.setFileId(fileId).build();
try {
rpcProxy.abandonBlock(null, req);
} catch (ServiceException e) {