/** @param m Mapping. */
  @SuppressWarnings({"unchecked"})
  private void finish(GridDistributedTxMapping<K, V> m) {
    GridRichNode n = m.node();

    assert !m.empty();

    GridNearTxFinishRequest req =
        new GridNearTxFinishRequest<K, V>(
            futId,
            tx.xidVersion(),
            tx.commitVersion(),
            tx.threadId(),
            commit,
            tx.isInvalidate(),
            m.explicitLock(),
            tx.topologyVersion(),
            null,
            null,
            null,
            commit && tx.pessimistic() ? m.writes() : null,
            tx.syncCommit() && commit || tx.syncRollback() && !commit);

    // If this is the primary node for the keys.
    if (n.isLocal()) {
      req.miniId(GridUuid.randomUuid());

      if (CU.DHT_ENABLED) {
        GridFuture<GridCacheTx> fut =
            commit ? dht().commitTx(n.id(), req) : dht().rollbackTx(n.id(), req);

        // Add new future.
        add(fut);
      } else
        // Add done future for testing.
        add(new GridFinishedFuture<GridCacheTx>(ctx));
    } else {
      MiniFuture fut = new MiniFuture(m);

      req.miniId(fut.futureId());

      add(fut); // Append new future.

      try {
        cctx.io().send(n, req);

        // If we don't wait for result, then mark future as done.
        if (!isSync() && !m.explicitLock()) fut.onDone();
      } catch (GridTopologyException e) {
        // Remove previous mapping.
        mappings.remove(m.node().id());

        fut.onResult(e);
      } catch (GridException e) {
        // Fail the whole thing.
        fut.onResult(e);
      }
    }
  }
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  /**
   * Acquires topology future and checks it completeness under the read lock. If it is not complete,
   * will asynchronously wait for it's completeness and then try again.
   */
  void mapOnTopology() {
    // We must acquire topology snapshot from the topology version future.
    try {
      cctx.topology().readLock();

      try {
        GridDhtTopologyFuture fut = cctx.topologyVersionFuture();

        if (fut.isDone()) {
          GridDiscoveryTopologySnapshot snapshot = fut.topologySnapshot();

          if (tx != null) {
            tx.topologyVersion(snapshot.topologyVersion());
            tx.topologySnapshot(snapshot);
          }

          topSnapshot.compareAndSet(null, snapshot);

          map(keys);

          markInitialized();
        } else {
          fut.listenAsync(
              new CI1<GridFuture<Long>>() {
                @Override
                public void apply(GridFuture<Long> t) {
                  mapOnTopology();
                }
              });
        }
      } finally {
        cctx.topology().readUnlock();
      }
    } catch (GridException e) {
      onDone(e);
    }
  }