@Override
  public ModifyColumnStoreFileTrackerResponse modifyColumnStoreFileTracker(RpcController controller,
    ModifyColumnStoreFileTrackerRequest req) throws ServiceException {
    try {
      long procId =
        server.modifyColumnStoreFileTracker(ProtobufUtil.toTableName(req.getTableName()),
          req.getFamily().toByteArray(), req.getDstSft(), req.getNonceGroup(), req.getNonce());
      return ModifyColumnStoreFileTrackerResponse.newBuilder().setProcId(procId).build();
    } catch (IOException ioe) {
      throw new ServiceException(ioe);
    }
  }
Checks if the specified snapshot is done.
@return true if the snapshot is in file system ready to use, false if the snapshot is in the
        process of completing
@throws ServiceException wrapping UnknownSnapshotException if invalid snapshot, or a wrapped
                         HBaseSnapshotException with progress failure reason.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java