// If the block is corrupted, it means all its available replicas are
        // corrupted. We don't mark it as missing given these available replicas
        // might still be accessible as the block might be incorrectly marked as
        // corrupted by client machines.
// If the block is corrupted, it means all its available replicas are
        // corrupted. We don't mark it as missing given these available replicas
        // might still be accessible as the block might be incorrectly marked as
        // corrupted by client machines. | NamenodeFsck.java