* @param bpid Block pool Id
* @param blockId a block's id
* @return on disk data file path; null if the replica does not exist
*/
File getFile(final String bpid, final long blockId) {
ReplicaInfo info = volumeMap.get(bpid, blockId);
if (info != null) {
return info.getBlockFile();
}
return null;
}