datanode 升级源码探究

Path：hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolSliceStorage.java

private void doUpgrade(final StorageDirectory bpSd,
      final NamespaceInfo nsInfo,
      final List<Callable<StorageDirectory>> callables,
      final Configuration conf) throws IOException {