public List<ReplicaId> getInFlightReplicas(){
    return inFlightReplicas;
  }
Use FileCopyTemporaryDirectoryName to create a temporary directory for file copy.
This will be used to write the files which are not yet written and can be cleaned
up without
ambry-file-transfer/src/main/java/com/github/ambry/filetransfer/FileCopyBasedReplicationSchedulerImpl.java