code: protected void fixDigests() {
          Digest digest=fetchDigestsFromAllMembersInSubPartition(gms.view, null);
          Message msg=new Message().putHeader(gms.getId(), new GMS.GmsHeader(GMS.GmsHeader.INSTALL_DIGEST))
            .setBuffer(GMS.marshal(null, digest));
          gms.getDownProtocol().down(msg);
      }
docs: Fetches the digests from all members and installs them again. Used only for diagnosis and support; don't
  use this otherwise !