예제 #1
0
  /**
   * Message received callback.
   *
   * @param src Sender node ID.
   * @param msg Received message.
   * @return {@code True}.
   */
  public boolean onMessageReceived(UUID src, GridHadoopMessage msg) {
    if (msg instanceof GridHadoopShuffleMessage) {
      GridHadoopShuffleMessage m = (GridHadoopShuffleMessage) msg;

      try {
        job(m.jobId()).onShuffleMessage(m);
      } catch (GridException e) {
        U.error(log, "Message handling failed.", e);
      }

      try {
        // Reply with ack.
        send0(src, new GridHadoopShuffleAck(m.id(), m.jobId()));
      } catch (GridException e) {
        U.error(
            log,
            "Failed to reply back to shuffle message sender [snd=" + src + ", msg=" + msg + ']',
            e);
      }
    } else if (msg instanceof GridHadoopShuffleAck) {
      GridHadoopShuffleAck m = (GridHadoopShuffleAck) msg;

      try {
        job(m.jobId()).onShuffleAck(m);
      } catch (GridException e) {
        U.error(log, "Message handling failed.", e);
      }
    } else
      throw new IllegalStateException(
          "Unknown message type received to Hadoop shuffle [src=" + src + ", msg=" + msg + ']');

    return true;
  }
  /** @param e Error. */
  void onError(Throwable e) {
    tx.commitError(e);

    if (err.compareAndSet(null, e)) {
      boolean marked = tx.setRollbackOnly();

      if (e instanceof GridCacheTxRollbackException) {
        if (marked) {
          try {
            tx.rollback();
          } catch (GridException ex) {
            U.error(log, "Failed to automatically rollback transaction: " + tx, ex);
          }
        }
      } else if (tx.implicit()
          && tx.isSystemInvalidate()) { // Finish implicit transaction on heuristic error.
        try {
          tx.close();
        } catch (GridException ex) {
          U.error(log, "Failed to invalidate transaction: " + tx, ex);
        }
      }

      onComplete();
    }
  }
  /**
   * Processes unlock request.
   *
   * @param nodeId Sender node ID.
   * @param req Unlock request.
   */
  @SuppressWarnings({"unchecked"})
  private void processUnlockRequest(UUID nodeId, GridDistributedUnlockRequest req) {
    assert nodeId != null;

    try {
      ClassLoader ldr = ctx.deploy().globalLoader();
      List<byte[]> keys = req.keyBytes();

      for (byte[] keyBytes : keys) {
        K key = (K) U.unmarshal(ctx.marshaller(), new ByteArrayInputStream(keyBytes), ldr);

        while (true) {
          boolean created = false;

          GridDistributedCacheEntry<K, V> entry = peekexx(key);

          if (entry == null) {
            entry = entryexx(key);

            created = true;
          }

          try {
            entry.doneRemote(
                req.version(), req.version(), req.committedVersions(), req.rolledbackVersions());

            // Note that we don't reorder completed versions here,
            // as there is no point to reorder relative to the version
            // we are about to remove.
            if (entry.removeLock(req.version())) {
              if (log.isDebugEnabled())
                log.debug("Removed lock [lockId=" + req.version() + ", key=" + key + ']');

              if (created && entry.markObsolete(req.version())) removeIfObsolete(entry.key());
            } else if (log.isDebugEnabled())
              log.debug(
                  "Received unlock request for unknown candidate "
                      + "(added to cancelled locks set): "
                      + req);

            break;
          } catch (GridCacheEntryRemovedException ignored) {
            if (log.isDebugEnabled())
              log.debug(
                  "Received remove lock request for removed entry (will retry) [entry="
                      + entry
                      + ", req="
                      + req
                      + ']');
          }
        }
      }
    } catch (GridException e) {
      U.error(log, "Failed to unmarshal unlock key (unlock will not be performed): " + req, e);
    }
  }
  /** {@inheritDoc} */
  @Override
  public boolean onDone(GridCacheTx tx, Throwable err) {
    if ((initialized() || err != null) && super.onDone(tx, err)) {
      if (error() instanceof GridCacheTxHeuristicException) {
        long topVer = this.tx.topologyVersion();

        for (GridCacheTxEntry<K, V> e : this.tx.writeMap().values()) {
          try {
            if (e.op() != NOOP && !cctx.affinity().localNode(e.key(), topVer)) {
              GridCacheEntryEx<K, V> cacheEntry = cctx.cache().peekEx(e.key());

              if (cacheEntry != null) cacheEntry.invalidate(null, this.tx.xidVersion());
            }
          } catch (Throwable t) {
            U.error(log, "Failed to invalidate entry.", t);

            if (t instanceof Error) throw (Error) t;
          }
        }
      }

      // Don't forget to clean up.
      cctx.mvcc().removeFuture(this);

      return true;
    }

    return false;
  }
  /** Initializes future. */
  @SuppressWarnings({"unchecked"})
  void finish() {
    if (mappings != null) {
      finish(mappings.values());

      markInitialized();

      if (!isSync()) {
        boolean complete = true;

        for (GridFuture<?> f : pending())
          // Mini-future in non-sync mode gets done when message gets sent.
          if (isMini(f) && !f.isDone()) complete = false;

        if (complete) onComplete();
      }
    } else {
      assert !commit;

      try {
        tx.rollback();
      } catch (GridException e) {
        U.error(log, "Failed to rollback empty transaction: " + tx, e);
      }

      markInitialized();
    }
  }
  /**
   * @param nodeId Sender node ID.
   * @param msg Response to prepare request.
   */
  private void processPrepareResponse(UUID nodeId, GridDistributedTxPrepareResponse<K, V> msg) {
    assert nodeId != null;
    assert msg != null;

    GridReplicatedTxLocal<K, V> tx = ctx.tm().tx(msg.version());

    if (tx == null) {
      if (log.isDebugEnabled())
        log.debug(
            "Received prepare response for non-existing transaction [senderNodeId="
                + nodeId
                + ", res="
                + msg
                + ']');

      return;
    }

    GridReplicatedTxPrepareFuture<K, V> future = (GridReplicatedTxPrepareFuture<K, V>) tx.future();

    if (future != null) future.onResult(nodeId, msg);
    else
      U.error(
          log,
          "Received prepare response for transaction with no future [res="
              + msg
              + ", tx="
              + tx
              + ']');
  }
  /**
   * @param nodeId Sender node ID.
   * @param msg Finish transaction response.
   */
  private void processFinishResponse(UUID nodeId, GridDistributedTxFinishResponse<K, V> msg) {
    GridReplicatedTxCommitFuture<K, V> fut =
        (GridReplicatedTxCommitFuture<K, V>)
            ctx.mvcc().<GridCacheTx>future(msg.xid().id(), msg.futureId());

    if (fut != null) fut.onResult(nodeId);
    else U.warn(log, "Received finish response for unknown transaction: " + msg);
  }
  /**
   * Reconstructs object on demarshalling.
   *
   * @return Reconstructed object.
   * @throws ObjectStreamException Thrown in case of demarshalling error.
   */
  private Object readResolve() throws ObjectStreamException {
    GridTuple2<GridCacheContext, String> t = stash.get();

    try {
      return t.get1().dataStructures().sequence(t.get2(), 0L, false, false);
    } catch (GridException e) {
      throw U.withCause(new InvalidObjectException(e.getMessage()), e);
    }
  }
예제 #9
0
  /**
   * @param nodeId Sender.
   * @param res Result.
   */
  void onResult(UUID nodeId, GridNearLockResponse<K, V> res) {
    if (!isDone()) {
      if (log.isDebugEnabled())
        log.debug(
            "Received lock response from node [nodeId="
                + nodeId
                + ", res="
                + res
                + ", fut="
                + this
                + ']');

      for (GridFuture<Boolean> fut : pending()) {
        if (isMini(fut)) {
          MiniFuture mini = (MiniFuture) fut;

          if (mini.futureId().equals(res.miniId())) {
            assert mini.node().id().equals(nodeId);

            if (log.isDebugEnabled())
              log.debug("Found mini future for response [mini=" + mini + ", res=" + res + ']');

            mini.onResult(res);

            if (log.isDebugEnabled())
              log.debug(
                  "Future after processed lock response [fut="
                      + this
                      + ", mini="
                      + mini
                      + ", res="
                      + res
                      + ']');

            return;
          }
        }
      }

      U.warn(
          log,
          "Failed to find mini future for response (perhaps due to stale message) [res="
              + res
              + ", fut="
              + this
              + ']');
    } else if (log.isDebugEnabled())
      log.debug(
          "Ignoring lock response from node (future is done) [nodeId="
              + nodeId
              + ", res="
              + res
              + ", fut="
              + this
              + ']');
  }
  /**
   * Removes locks regardless of whether they are owned or not for given version and keys.
   *
   * @param ver Lock version.
   * @param keys Keys.
   */
  @SuppressWarnings({"unchecked"})
  public void removeLocks(GridCacheVersion ver, Collection<? extends K> keys) {
    if (keys.isEmpty()) return;

    Collection<GridRichNode> nodes = ctx.remoteNodes(keys);

    try {
      // Send request to remove from remote nodes.
      GridDistributedUnlockRequest<K, V> req = new GridDistributedUnlockRequest<K, V>(keys.size());

      req.version(ver);

      for (K key : keys) {
        while (true) {
          GridDistributedCacheEntry<K, V> entry = peekexx(key);

          try {
            if (entry != null) {
              GridCacheMvccCandidate<K> cand = entry.candidate(ver);

              if (cand != null) {
                // Remove candidate from local node first.
                if (entry.removeLock(cand.version())) {
                  // If there is only local node in this lock's topology,
                  // then there is no reason to distribute the request.
                  if (nodes.isEmpty()) continue;

                  req.addKey(entry.key(), entry.getOrMarshalKeyBytes(), ctx);
                }
              }
            }

            break;
          } catch (GridCacheEntryRemovedException ignored) {
            if (log.isDebugEnabled())
              log.debug(
                  "Attempted to remove lock from removed entry (will retry) [rmvVer="
                      + ver
                      + ", entry="
                      + entry
                      + ']');
          }
        }
      }

      if (nodes.isEmpty()) return;

      req.completedVersions(ctx.tm().committedVersions(ver), ctx.tm().rolledbackVersions(ver));

      if (!req.keyBytes().isEmpty())
        // We don't wait for reply to this message.
        ctx.io().safeSend(nodes, req, null);
    } catch (GridException ex) {
      U.error(log, "Failed to unlock the lock for keys: " + keys, ex);
    }
  }
예제 #11
0
  /** @param jobId Job id. */
  public void jobFinished(GridHadoopJobId jobId) {
    GridHadoopShuffleJob job = jobs.remove(jobId);

    if (job != null) {
      try {
        job.close();
      } catch (GridException e) {
        U.error(log, "Failed to close job: " + jobId, e);
      }
    }
  }
예제 #12
0
  /**
   * Flushes every internal buffer if buffer was flushed before passed in threshold.
   *
   * <p>Does not wait for result and does not fail on errors assuming that this method should be
   * called periodically.
   */
  @Override
  public void tryFlush() throws GridInterruptedException {
    if (!busyLock.enterBusy()) return;

    try {
      for (Buffer buf : bufMappings.values()) buf.flush();

      lastFlushTime = U.currentTimeMillis();
    } finally {
      leaveBusy();
    }
  }
예제 #13
0
  /**
   * Stops shuffle.
   *
   * @param cancel If should cancel all ongoing activities.
   */
  @Override
  public void stop(boolean cancel) {
    for (GridHadoopShuffleJob job : jobs.values()) {
      try {
        job.close();
      } catch (GridException e) {
        U.error(log, "Failed to close job.", e);
      }
    }

    jobs.clear();
  }
예제 #14
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    void cancelAll() {
      GridException err =
          new GridException("Data loader has been cancelled: " + GridDataLoaderImpl.this);

      for (GridFuture<?> f : locFuts) {
        try {
          f.cancel();
        } catch (GridException e) {
          U.error(log, "Failed to cancel mini-future.", e);
        }
      }

      for (GridFutureAdapter<?> f : reqs.values()) f.onDone(err);
    }
예제 #15
0
    /** {@inheritDoc} */
    @Override
    public ClassLoader classLoader() {
      if (ldr == null) {
        ClassLoader ldr0 = deployClass().getClassLoader();

        // Safety.
        if (ldr0 == null) ldr0 = U.gridClassLoader();

        assert ldr0 != null : "Failed to detect classloader [objs=" + objs + ']';

        ldr = ldr0;
      }

      return ldr;
    }
예제 #16
0
    /** {@inheritDoc} */
    @Override
    public Class<?> deployClass() {
      if (cls == null) {
        Class<?> cls0 = null;

        if (depCls != null) cls0 = depCls;
        else {
          for (Iterator<Object> it = objs.iterator();
              (cls0 == null || U.isJdk(cls0)) && it.hasNext(); ) {
            Object o = it.next();

            if (o != null) cls0 = U.detectClass(o);
          }

          if (cls0 == null || U.isJdk(cls0)) cls0 = GridDataLoaderImpl.class;
        }

        assert cls0 != null : "Failed to detect deploy class [objs=" + objs + ']';

        cls = cls0;
      }

      return cls;
    }
  /**
   * @param cctx Context.
   * @param tx Transaction.
   * @param failedNodeId ID of failed node started transaction.
   */
  @SuppressWarnings("ConstantConditions")
  public GridCachePessimisticCheckCommittedTxFuture(
      GridCacheContext<K, V> cctx, GridCacheTxEx<K, V> tx, UUID failedNodeId) {
    super(cctx.kernalContext(), new SingleReducer<K, V>());

    this.cctx = cctx;
    this.tx = tx;
    this.failedNodeId = failedNodeId;

    log = U.logger(ctx, logRef, GridCacheOptimisticCheckPreparedTxFuture.class);

    nodes = new GridLeanMap<>();

    for (GridNode node : CU.allNodes(cctx, tx.topologyVersion())) nodes.put(node.id(), node);
  }
  /**
   * @param cctx Context.
   * @param tx Transaction.
   * @param commit Commit flag.
   */
  public GridNearTxFinishFuture(
      GridCacheContext<K, V> cctx, GridNearTxLocal<K, V> tx, boolean commit) {
    super(cctx.kernalContext(), F.<GridCacheTx>identityReducer(tx));

    assert cctx != null;

    this.cctx = cctx;
    this.tx = tx;
    this.commit = commit;

    mappings = tx.mappings();

    futId = GridUuid.randomUuid();

    log = U.logger(ctx, logRef, GridNearTxFinishFuture.class);
  }
  /**
   * Processes lock response.
   *
   * @param nodeId Sender node ID.
   * @param res Lock response.
   */
  private void processLockResponse(UUID nodeId, GridDistributedLockResponse<K, V> res) {
    GridReplicatedLockFuture<K, V> fut = futurex(res.lockId(), res.futureId());

    if (fut == null) {
      U.warn(log, "Received lock response for non-existing future (will ignore): " + res);
    } else {
      fut.onResult(nodeId, res);

      if (fut.isDone()) {
        ctx.mvcc().removeFuture(fut);

        if (log.isDebugEnabled())
          log.debug("Received all replies for future (future was removed): " + fut);
      }
    }
  }
예제 #20
0
  /** {@inheritDoc} */
  @Override
  public void isolated(boolean isolated) throws GridException {
    if (isolated()) return;

    GridNode node = F.first(ctx.grid().forCache(cacheName).nodes());

    if (node == null) throw new GridException("Failed to get node for cache: " + cacheName);

    GridCacheAttributes a = U.cacheAttributes(node, cacheName);

    assert a != null;

    updater =
        a.atomicityMode() == GridCacheAtomicityMode.ATOMIC
            ? GridDataLoadCacheUpdaters.<K, V>batched()
            : GridDataLoadCacheUpdaters.<K, V>groupLocked();
  }
예제 #21
0
    /** @param e Error. */
    void onResult(Throwable e) {
      if (rcvRes.compareAndSet(false, true)) {
        if (log.isDebugEnabled())
          log.debug("Failed to get future result [fut=" + this + ", err=" + e + ']');

        // Fail.
        onDone(e);
      } else
        U.warn(
            log,
            "Received error after another result has been processed [fut="
                + GridNearLockFuture.this
                + ", mini="
                + this
                + ']',
            e);
    }
  /** @param e Error. */
  void onError(Throwable e) {
    tx.commitError(e);

    if (err.compareAndSet(null, e)) {
      boolean marked = tx.setRollbackOnly();

      if (e instanceof GridCacheTxRollbackException)
        if (marked) {
          try {
            tx.rollback();
          } catch (GridException ex) {
            U.error(log, "Failed to automatically rollback transaction: " + tx, ex);
          }
        }

      onComplete();
    }
  }
예제 #23
0
    /** @param res Response. */
    void onResponse(GridDataLoadResponse res) {
      if (log.isDebugEnabled()) log.debug("Received data load response: " + res);

      GridFutureAdapter<?> f = reqs.remove(res.requestId());

      if (f == null) {
        if (log.isDebugEnabled())
          log.debug("Future for request has not been found: " + res.requestId());

        return;
      }

      Throwable err = null;

      byte[] errBytes = res.errorBytes();

      if (errBytes != null) {
        try {
          GridPeerDeployAware jobPda0 = jobPda;

          err =
              ctx.config()
                  .getMarshaller()
                  .unmarshal(
                      errBytes, jobPda0 != null ? jobPda0.classLoader() : U.gridClassLoader());
        } catch (GridException e) {
          f.onDone(null, new GridException("Failed to unmarshal response.", e));

          return;
        }
      }

      f.onDone(null, err);

      if (log.isDebugEnabled())
        log.debug(
            "Finished future [fut=" + f + ", reqId=" + res.requestId() + ", err=" + err + ']');
    }
예제 #24
0
  /**
   * @param cctx Registry.
   * @param keys Keys to lock.
   * @param tx Transaction.
   * @param read Read flag.
   * @param retval Flag to return value or not.
   * @param timeout Lock acquisition timeout.
   * @param filter Filter.
   */
  public GridNearLockFuture(
      GridCacheContext<K, V> cctx,
      Collection<? extends K> keys,
      @Nullable GridNearTxLocal<K, V> tx,
      boolean read,
      boolean retval,
      long timeout,
      GridPredicate<GridCacheEntry<K, V>>[] filter) {
    super(cctx.kernalContext(), CU.boolReducer());
    assert cctx != null;
    assert keys != null;

    this.cctx = cctx;
    this.keys = keys;
    this.tx = tx;
    this.read = read;
    this.retval = retval;
    this.timeout = timeout;
    this.filter = filter;

    threadId = tx == null ? Thread.currentThread().getId() : tx.threadId();

    lockVer = tx != null ? tx.xidVersion() : cctx.versions().next();

    futId = GridUuid.randomUuid();

    entries = new ArrayList<>(keys.size());

    log = U.logger(ctx, logRef, GridNearLockFuture.class);

    if (timeout > 0) {
      timeoutObj = new LockTimeoutObject();

      cctx.time().addTimeoutObject(timeoutObj);
    }

    valMap = new ConcurrentHashMap8<>(keys.size(), 1f);
  }
예제 #25
0
  /** {@inheritDoc} */
  @Override
  public void rollback() throws GridException {
    GridNearTxPrepareFuture<K, V> prepFut = this.prepFut.get();

    GridNearTxFinishFuture<K, V> fut = rollbackFut.get();

    if (fut == null
        && !rollbackFut.compareAndSet(
            null, fut = new GridNearTxFinishFuture<K, V>(cctx, this, false))) {
      rollbackFut.get();

      return;
    }

    try {
      cctx.mvcc().addFuture(fut);

      if (prepFut == null) {
        finish(false);

        fut.finish();
      } else {
        prepFut.listenAsync(
            new CI1<GridFuture<GridCacheTxEx<K, V>>>() {
              @Override
              public void apply(GridFuture<GridCacheTxEx<K, V>> f) {
                try {
                  // Check for errors in prepare future.
                  f.get();
                } catch (GridException e) {
                  if (log.isDebugEnabled())
                    log.debug("Got optimistic tx failure [tx=" + this + ", err=" + e + ']');
                }

                try {
                  finish(false);

                  rollbackFut.get().finish();
                } catch (GridException e) {
                  U.error(log, "Failed to gracefully rollback transaction: " + this, e);

                  rollbackFut.get().onError(e);
                }
              }
            });
      }

      // TODO: Rollback Async?
      fut.get();
    } catch (Error e) {
      U.addLastCause(e, commitErr.get());

      throw e;
    } catch (RuntimeException e) {
      U.addLastCause(e, commitErr.get());

      throw e;
    } catch (GridException e) {
      U.addLastCause(e, commitErr.get());

      throw e;
    } finally {
      cctx.tm().txContextReset();
      cctx.near().dht().context().tm().txContextReset();
    }
  }
예제 #26
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  /** {@inheritDoc} */
  @Override
  public GridFuture<GridCacheTxEx<K, V>> prepareAsync() {
    GridNearTxPrepareFuture<K, V> fut = prepFut.get();

    if (fut == null) {
      // Future must be created before any exception can be thrown.
      if (!prepFut.compareAndSet(null, fut = new GridNearTxPrepareFuture<K, V>(cctx, this)))
        return prepFut.get();
    } else
      // Prepare was called explicitly.
      return fut;

    if (!state(PREPARING)) {
      if (setRollbackOnly()) {
        if (timedOut())
          fut.onError(
              new GridCacheTxTimeoutException(
                  "Transaction timed out and was rolled back: " + this));
        else
          fut.onError(
              new GridException(
                  "Invalid transaction state for prepare [state="
                      + state()
                      + ", tx="
                      + this
                      + ']'));
      } else
        fut.onError(
            new GridCacheTxRollbackException(
                "Invalid transaction state for prepare [state=" + state() + ", tx=" + this + ']'));

      return fut;
    }

    // For pessimistic mode we don't distribute prepare request.
    if (pessimistic()) {
      try {
        userPrepare();

        if (!state(PREPARED)) {
          setRollbackOnly();

          fut.onError(
              new GridException(
                  "Invalid transaction state for commit [state=" + state() + ", tx=" + this + ']'));

          return fut;
        }

        fut.complete();

        return fut;
      } catch (GridException e) {
        fut.onError(e);

        return fut;
      }
    }

    try {
      cctx.topology().readLock();

      try {
        topologyVersion(cctx.topology().topologyVersion());

        userPrepare();
      } finally {
        cctx.topology().readUnlock();
      }

      // This will attempt to locally commit
      // EVENTUALLY CONSISTENT transactions.
      fut.onPreparedEC();

      // Make sure to add future before calling prepare.
      cctx.mvcc().addFuture(fut);

      fut.prepare();
    } catch (GridCacheTxTimeoutException e) {
      fut.onError(e);
    } catch (GridCacheTxOptimisticException e) {
      fut.onError(e);
    } catch (GridException e) {
      setRollbackOnly();

      String msg = "Failed to prepare transaction (will attempt rollback): " + this;

      log.error(msg, e);

      try {
        rollback();
      } catch (GridException e1) {
        U.error(log, "Failed to rollback transaction: " + this, e1);
      }

      fut.onError(new GridCacheTxRollbackException(msg, e));
    }

    return fut;
  }
예제 #27
0
  /** {@inheritDoc} */
  @SuppressWarnings({"CatchGenericClass", "ThrowableInstanceNeverThrown"})
  @Override
  public void finish(boolean commit) throws GridException {
    if (log.isDebugEnabled())
      log.debug("Finishing near local tx [tx=" + this + ", commit=" + commit + "]");

    if (commit) {
      if (!state(COMMITTING)) {
        GridCacheTxState state = state();

        if (state != COMMITTING && state != COMMITTED)
          throw new GridException(
              "Invalid transaction state for commit [state=" + state() + ", tx=" + this + ']');
        else {
          if (log.isDebugEnabled())
            log.debug(
                "Invalid transaction state for commit (another thread is committing): " + this);

          return;
        }
      }
    } else {
      if (!state(ROLLING_BACK)) {
        if (log.isDebugEnabled())
          log.debug(
              "Invalid transaction state for rollback [state=" + state() + ", tx=" + this + ']');

        return;
      }
    }

    GridException err = null;

    // Commit to DB first. This way if there is a failure, transaction
    // won't be committed.
    try {
      if (commit && !isRollbackOnly()) userCommit();
      else userRollback();
    } catch (GridException e) {
      err = e;

      commit = false;

      // If heuristic error.
      if (!isRollbackOnly()) {
        invalidate = true;

        U.warn(
            log,
            "Set transaction invalidation flag to true due to error [tx="
                + this
                + ", err="
                + err
                + ']');
      }
    }

    if (err != null) {
      state(UNKNOWN);

      throw err;
    } else {
      if (!state(commit ? COMMITTED : ROLLED_BACK)) {
        state(UNKNOWN);

        throw new GridException("Invalid transaction state for commit or rollback: " + this);
      }
    }
  }
  /**
   * Removes locks regardless of whether they are owned or not for given version and keys.
   *
   * @param ver Lock version.
   * @param keys Keys.
   */
  @SuppressWarnings({"unchecked"})
  public void removeLocks(GridCacheVersion ver, Collection<? extends K> keys) {
    if (keys.isEmpty()) return;

    try {
      Collection<GridRichNode> affNodes = null;

      int keyCnt = -1;

      Map<GridNode, GridNearUnlockRequest<K, V>> map = null;

      for (K key : keys) {
        // Send request to remove from remote nodes.
        GridNearUnlockRequest<K, V> req = null;

        while (true) {
          GridDistributedCacheEntry<K, V> entry = peekExx(key);

          try {
            if (entry != null) {
              GridCacheMvccCandidate<K> cand = entry.candidate(ver);

              if (cand != null) {
                if (affNodes == null) {
                  affNodes = CU.allNodes(ctx, cand.topologyVersion());

                  keyCnt = (int) Math.ceil((double) keys.size() / affNodes.size());

                  map = new HashMap<GridNode, GridNearUnlockRequest<K, V>>(affNodes.size());
                }

                GridRichNode primary = CU.primary0(ctx.affinity(key, affNodes));

                if (!primary.isLocal()) {
                  req = map.get(primary);

                  if (req == null) {
                    map.put(primary, req = new GridNearUnlockRequest<K, V>(keyCnt));

                    req.version(ver);
                  }
                }

                // Remove candidate from local node first.
                if (entry.removeLock(cand.version())) {
                  if (primary.isLocal()) {
                    dht.removeLocks(primary.id(), ver, F.asList(key), true);

                    assert req == null;

                    continue;
                  }

                  req.addKey(entry.key(), entry.getOrMarshalKeyBytes(), ctx);
                }
              }
            }

            break;
          } catch (GridCacheEntryRemovedException ignored) {
            if (log.isDebugEnabled())
              log.debug(
                  "Attempted to remove lock from removed entry (will retry) [rmvVer="
                      + ver
                      + ", entry="
                      + entry
                      + ']');
          }
        }
      }

      if (map == null || map.isEmpty()) return;

      Collection<GridCacheVersion> committed = ctx.tm().committedVersions(ver);
      Collection<GridCacheVersion> rolledback = ctx.tm().rolledbackVersions(ver);

      for (Map.Entry<GridNode, GridNearUnlockRequest<K, V>> mapping : map.entrySet()) {
        GridNode n = mapping.getKey();

        GridDistributedUnlockRequest<K, V> req = mapping.getValue();

        if (!req.keyBytes().isEmpty()) {
          req.completedVersions(committed, rolledback);

          // We don't wait for reply to this message.
          ctx.io().send(n, req);
        }
      }
    } catch (GridException ex) {
      U.error(log, "Failed to unlock the lock for keys: " + keys, ex);
    }
  }
  /** {@inheritDoc} */
  @Override
  public void unlockAll(
      Collection<? extends K> keys, GridPredicate<? super GridCacheEntry<K, V>>[] filter) {
    if (keys.isEmpty()) return;

    try {
      GridCacheVersion ver = null;

      Collection<GridRichNode> affNodes = null;

      int keyCnt = -1;

      Map<GridRichNode, GridNearUnlockRequest<K, V>> map = null;

      Collection<K> locKeys = new LinkedList<K>();

      GridCacheVersion obsoleteVer = ctx.versions().next();

      for (K key : keys) {
        while (true) {
          GridDistributedCacheEntry<K, V> entry = peekExx(key);

          if (entry == null || !ctx.isAll(entry.wrap(false), filter)) break; // While.

          try {
            GridCacheMvccCandidate<K> cand =
                entry.candidate(ctx.nodeId(), Thread.currentThread().getId());

            if (cand != null) {
              ver = cand.version();

              if (affNodes == null) {
                affNodes = CU.allNodes(ctx, cand.topologyVersion());

                keyCnt = (int) Math.ceil((double) keys.size() / affNodes.size());

                map = new HashMap<GridRichNode, GridNearUnlockRequest<K, V>>(affNodes.size());
              }

              // Send request to remove from remote nodes.
              GridRichNode primary = CU.primary0(ctx.affinity(key, affNodes));

              GridNearUnlockRequest<K, V> req = map.get(primary);

              if (req == null) {
                map.put(primary, req = new GridNearUnlockRequest<K, V>(keyCnt));

                req.version(ver);
              }

              // Remove candidate from local node first.
              GridCacheMvccCandidate<K> rmv = entry.removeLock();

              if (rmv != null) {
                if (!rmv.reentry()) {
                  if (ver != null && !ver.equals(rmv.version()))
                    throw new GridException(
                        "Failed to unlock (if keys were locked separately, "
                            + "then they need to be unlocked separately): "
                            + keys);

                  if (!primary.isLocal()) {
                    assert req != null;

                    req.addKey(entry.key(), entry.getOrMarshalKeyBytes(), ctx);
                  } else locKeys.add(key);

                  if (log.isDebugEnabled()) log.debug("Removed lock (will distribute): " + rmv);
                } else if (log.isDebugEnabled())
                  log.debug(
                      "Current thread still owns lock (or there are no other nodes)"
                          + " [lock="
                          + rmv
                          + ", curThreadId="
                          + Thread.currentThread().getId()
                          + ']');
              }

              // Try to evict near entry if it's dht-mapped locally.
              evictNearEntry(entry, obsoleteVer);
            }

            break;
          } catch (GridCacheEntryRemovedException ignore) {
            if (log.isDebugEnabled())
              log.debug("Attempted to unlock removed entry (will retry): " + entry);
          }
        }
      }

      if (ver == null) return;

      for (Map.Entry<GridRichNode, GridNearUnlockRequest<K, V>> mapping : map.entrySet()) {
        GridRichNode n = mapping.getKey();

        GridDistributedUnlockRequest<K, V> req = mapping.getValue();

        if (n.isLocal()) dht.removeLocks(ctx.nodeId(), req.version(), locKeys, true);
        else if (!req.keyBytes().isEmpty())
          // We don't wait for reply to this message.
          ctx.io().send(n, req);
      }
    } catch (GridException ex) {
      U.error(log, "Failed to unlock the lock for keys: " + keys, ex);
    }
  }
  /**
   * @param nodeId Primary node ID.
   * @param req Request.
   * @return Remote transaction.
   * @throws GridException If failed.
   * @throws GridDistributedLockCancelledException If lock has been cancelled.
   */
  @SuppressWarnings({"RedundantTypeArguments"})
  @Nullable
  public GridNearTxRemote<K, V> startRemoteTxForFinish(
      UUID nodeId, GridDhtTxFinishRequest<K, V> req)
      throws GridException, GridDistributedLockCancelledException {
    GridNearTxRemote<K, V> tx = null;

    ClassLoader ldr = ctx.deploy().globalLoader();

    if (ldr != null) {
      for (GridCacheTxEntry<K, V> txEntry : req.nearWrites()) {
        GridDistributedCacheEntry<K, V> entry = null;

        while (true) {
          try {
            entry = peekExx(txEntry.key());

            if (entry != null) {
              entry.keyBytes(txEntry.keyBytes());

              // Handle implicit locks for pessimistic transactions.
              tx = ctx.tm().tx(req.version());

              if (tx != null) {
                if (tx.local()) return null;

                if (tx.markFinalizing()) tx.addWrite(txEntry.key(), txEntry.keyBytes());
                else return null;
              } else {
                tx =
                    new GridNearTxRemote<K, V>(
                        nodeId,
                        req.nearNodeId(),
                        req.threadId(),
                        req.version(),
                        null,
                        PESSIMISTIC,
                        req.isolation(),
                        req.isInvalidate(),
                        0,
                        txEntry.key(),
                        txEntry.keyBytes(),
                        txEntry.value(),
                        txEntry.valueBytes(),
                        ctx);

                if (tx.empty()) return tx;

                tx = ctx.tm().onCreated(tx);

                if (tx == null || !ctx.tm().onStarted(tx))
                  throw new GridCacheTxRollbackException(
                      "Failed to acquire lock "
                          + "(transaction has been completed): "
                          + req.version());

                if (!tx.markFinalizing()) return null;
              }

              // Add remote candidate before reordering.
              if (txEntry.explicitVersion() == null)
                entry.addRemote(
                    req.nearNodeId(),
                    nodeId,
                    req.threadId(),
                    req.version(),
                    0,
                    tx.ec(),
                    /*tx*/ true,
                    tx.implicitSingle());

              // Remote candidates for ordered lock queuing.
              entry.addRemoteCandidates(
                  Collections.<GridCacheMvccCandidate<K>>emptyList(),
                  req.version(),
                  req.committedVersions(),
                  req.rolledbackVersions());
            }

            // Double-check in case if sender node left the grid.
            if (ctx.discovery().node(req.nearNodeId()) == null) {
              if (log.isDebugEnabled())
                log.debug("Node requesting lock left grid (lock request will be ignored): " + req);

              if (tx != null) tx.rollback();

              return null;
            }

            // Entry is legit.
            break;
          } catch (GridCacheEntryRemovedException ignored) {
            assert entry.obsoleteVersion() != null
                : "Obsolete flag not set on removed entry: " + entry;

            if (log.isDebugEnabled())
              log.debug("Received entry removed exception (will retry on renewed entry): " + entry);

            if (tx != null) {
              tx.clearEntry(entry.key());

              if (log.isDebugEnabled())
                log.debug(
                    "Cleared removed entry from remote transaction (will retry) [entry="
                        + entry
                        + ", tx="
                        + tx
                        + ']');
            }
          }
        }
      }
    } else {
      String err = "Failed to acquire deployment class loader for message: " + req;

      U.warn(log, err);

      throw new GridException(err);
    }

    return tx;
  }