示例#1
0
  /** {@inheritDoc} */
  @Override
  public GridFuture<Boolean> loadMissing(
      boolean async, final Collection<? extends K> keys, final GridInClosure2<K, V> closure) {
    GridFuture<Map<K, V>> f = cctx.near().txLoadAsync(this, keys, CU.<K, V>empty());

    return new GridEmbeddedFuture<Boolean, Map<K, V>>(
        cctx.kernalContext(),
        f,
        new C2<Map<K, V>, Exception, Boolean>() {
          @Override
          public Boolean apply(Map<K, V> map, Exception e) {
            if (e != null) {
              setRollbackOnly();

              throw new GridClosureException(e);
            }

            // Must loop through keys, not map entries,
            // as map entries may not have all the keys.
            for (K key : keys) closure.apply(key, map.get(key));

            return true;
          }
        });
  }
  /**
   * @param entry Transaction entry.
   * @param nodes Nodes.
   */
  private void map(GridCacheTxEntry<K, V> entry, Collection<GridRichNode> nodes) {
    GridRichNode primary = CU.primary0(cctx.affinity(entry.key(), nodes));

    GridDistributedTxMapping<K, V> t = mappings.get(primary.id());

    if (t == null) mappings.put(primary.id(), t = new GridDistributedTxMapping<K, V>(primary));

    t.add(entry);
  }
  /**
   * Peeks only near cache without looking into DHT cache.
   *
   * @param key Key.
   * @return Peeked value.
   */
  @Nullable
  public V peekNearOnly(K key) {
    try {
      return peek0(true, key, SMART, CU.<K, V>empty());
    } catch (GridCacheFilterFailedException ignored) {
      if (log.isDebugEnabled()) log.debug("Filter validation failed for key: " + key);

      return null;
    }
  }
  /**
   * @param reads Read entries.
   * @param writes Write entries.
   */
  @SuppressWarnings({"unchecked"})
  private void prepare(
      Iterable<GridCacheTxEntry<K, V>> reads, Iterable<GridCacheTxEntry<K, V>> writes) {
    Collection<GridRichNode> nodes = CU.allNodes(cctx);

    // Assign keys to primary nodes.
    for (GridCacheTxEntry<K, V> read : reads) map(read, nodes);

    for (GridCacheTxEntry<K, V> write : writes) map(write, nodes);

    // Create mini futures.
    for (GridDistributedTxMapping<K, V> m : mappings.values()) finish(m);
  }
    /** {@inheritDoc} */
    @Override
    public void remove() {
      if (currEntry == null) throw new IllegalStateException();

      assert currIter != null;

      currIter.remove();

      try {
        GridNearCache.this.remove(currEntry.getKey(), CU.<K, V>empty());
      } catch (GridException e) {
        throw new GridRuntimeException(e);
      }
    }
  /**
   * @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);
  }
示例#7
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);
  }
  /** {@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 e Transaction entry.
  * @return {@code True} if entry is locally mapped as a primary or back up node.
  */
 protected boolean isNearLocallyMapped(GridCacheEntryEx<K, V> e) {
   return F.contains(ctx.affinity(e.key(), CU.allNodes(ctx)), ctx.localNode());
 }
 /** {@inheritDoc} */
 @Override
 public Map<GridRichNode, Collection<K>> mapKeysToNodes(Collection<? extends K> keys) {
   return CU.mapKeysToNodes(ctx, keys);
 }
 /** @return Near entries. */
 public Set<GridCacheEntry<K, V>> nearEntries() {
   return super.entrySet(CU.<K, V>empty());
 }
  /**
   * Synchronous sequence update operation. Will add given amount to the sequence value.
   *
   * @param l Increment amount.
   * @param updateCall Cache call that will update sequence reservation count in accordance with l.
   * @param updated If {@code true}, will return sequence value after update, otherwise will return
   *     sequence value prior to update.
   * @return Sequence value.
   * @throws GridException If update failed.
   */
  private long internalUpdate(long l, @Nullable Callable<Long> updateCall, boolean updated)
      throws GridException {
    checkRemoved();

    assert l > 0;

    lock.lock();

    try {
      // If reserved range isn't exhausted.
      if (locVal + l <= upBound) {
        long curVal = locVal;

        locVal += l;

        return updated ? locVal : curVal;
      }
    } finally {
      lock.unlock();
    }

    if (updateCall == null) updateCall = internalUpdate(l, updated);

    while (true) {
      if (updateGuard.compareAndSet(false, true)) {
        try {
          // This call must be outside lock.
          return CU.outTx(updateCall, ctx);
        } finally {
          lock.lock();

          try {
            updateGuard.set(false);

            cond.signalAll();
          } finally {
            lock.unlock();
          }
        }
      } else {
        lock.lock();

        try {
          while (locVal >= upBound && updateGuard.get()) {
            try {
              cond.await(500, MILLISECONDS);
            } catch (InterruptedException e) {
              throw new GridInterruptedException(e);
            }
          }

          checkRemoved();

          // If reserved range isn't exhausted.
          if (locVal + l <= upBound) {
            long curVal = locVal;

            locVal += l;

            return updated ? locVal : curVal;
          }
        } finally {
          lock.unlock();
        }
      }
    }
  }
示例#13
0
  /**
   * Maps keys to nodes. Note that we can not simply group keys by nodes and send lock request as
   * such approach does not preserve order of lock acquisition. Instead, keys are split in
   * continuous groups belonging to one primary node and locks for these groups are acquired
   * sequentially.
   *
   * @param keys Keys.
   */
  private void map(Iterable<? extends K> keys) {
    try {
      GridDiscoveryTopologySnapshot snapshot = topSnapshot.get();

      assert snapshot != null;

      long topVer = snapshot.topologyVersion();

      assert topVer > 0;

      if (CU.affinityNodes(cctx, topVer).isEmpty()) {
        onDone(
            new GridTopologyException(
                "Failed to map keys for near-only cache (all "
                    + "partition nodes left the grid)."));

        return;
      }

      ConcurrentLinkedDeque8<GridNearLockMapping<K, V>> mappings = new ConcurrentLinkedDeque8<>();

      // Assign keys to primary nodes.
      GridNearLockMapping<K, V> map = null;

      for (K key : keys) {
        GridNearLockMapping<K, V> updated = map(key, map, topVer);

        // If new mapping was created, add to collection.
        if (updated != map) mappings.add(updated);

        map = updated;
      }

      if (isDone()) {
        if (log.isDebugEnabled()) log.debug("Abandoning (re)map because future is done: " + this);

        return;
      }

      if (log.isDebugEnabled())
        log.debug("Starting (re)map for mappings [mappings=" + mappings + ", fut=" + this + ']');

      // Create mini futures.
      for (Iterator<GridNearLockMapping<K, V>> iter = mappings.iterator(); iter.hasNext(); ) {
        GridNearLockMapping<K, V> mapping = iter.next();

        GridNode node = mapping.node();
        Collection<K> mappedKeys = mapping.mappedKeys();

        assert !mappedKeys.isEmpty();

        GridNearLockRequest<K, V> req = null;

        Collection<K> distributedKeys = new ArrayList<>(mappedKeys.size());

        boolean explicit = false;

        for (K key : mappedKeys) {
          while (true) {
            GridNearCacheEntry<K, V> entry = null;

            try {
              entry = cctx.near().entryExx(key, topVer);

              if (!cctx.isAll(entry.wrap(false), filter)) {
                if (log.isDebugEnabled())
                  log.debug("Entry being locked did not pass filter (will not lock): " + entry);

                onComplete(false, false);

                return;
              }

              // Removed exception may be thrown here.
              GridCacheMvccCandidate<K> cand = addEntry(topVer, entry, node.id());

              if (isDone()) {
                if (log.isDebugEnabled())
                  log.debug(
                      "Abandoning (re)map because future is done after addEntry attempt "
                          + "[fut="
                          + this
                          + ", entry="
                          + entry
                          + ']');

                return;
              }

              if (cand != null) {
                if (tx == null && !cand.reentry())
                  cctx.mvcc().addExplicitLock(threadId, cand, snapshot);

                GridTuple3<GridCacheVersion, V, byte[]> val = entry.versionedValue();

                if (val == null) {
                  GridDhtCacheEntry<K, V> dhtEntry = dht().peekExx(key);

                  try {
                    if (dhtEntry != null) val = dhtEntry.versionedValue(topVer);
                  } catch (GridCacheEntryRemovedException ignored) {
                    assert dhtEntry.obsolete()
                        : " Got removed exception for non-obsolete entry: " + dhtEntry;

                    if (log.isDebugEnabled())
                      log.debug(
                          "Got removed exception for DHT entry in map (will ignore): " + dhtEntry);
                  }
                }

                GridCacheVersion dhtVer = null;

                if (val != null) {
                  dhtVer = val.get1();

                  valMap.put(key, val);
                }

                if (!cand.reentry()) {
                  if (req == null) {
                    req =
                        new GridNearLockRequest<>(
                            topVer,
                            cctx.nodeId(),
                            threadId,
                            futId,
                            lockVer,
                            inTx(),
                            implicitTx(),
                            implicitSingleTx(),
                            read,
                            isolation(),
                            isInvalidate(),
                            timeout,
                            syncCommit(),
                            syncRollback(),
                            mappedKeys.size(),
                            inTx() ? tx.size() : mappedKeys.size(),
                            inTx() ? tx.groupLockKey() : null,
                            inTx() && tx.partitionLock(),
                            inTx() ? tx.subjectId() : null);

                    mapping.request(req);
                  }

                  distributedKeys.add(key);

                  GridCacheTxEntry<K, V> writeEntry = tx != null ? tx.writeMap().get(key) : null;

                  if (tx != null) tx.addKeyMapping(key, mapping.node());

                  req.addKeyBytes(
                      key,
                      node.isLocal() ? null : entry.getOrMarshalKeyBytes(),
                      retval && dhtVer == null,
                      dhtVer, // Include DHT version to match remote DHT entry.
                      writeEntry,
                      inTx() ? tx.entry(key).drVersion() : null,
                      cctx);

                  // Clear transfer required flag since we are sending message.
                  if (writeEntry != null) writeEntry.transferRequired(false);
                }

                if (cand.reentry())
                  explicit = tx != null && !entry.hasLockCandidate(tx.xidVersion());
              } else
                // Ignore reentries within transactions.
                explicit = tx != null && !entry.hasLockCandidate(tx.xidVersion());

              if (explicit) tx.addKeyMapping(key, mapping.node());

              break;
            } catch (GridCacheEntryRemovedException ignored) {
              assert entry.obsolete() : "Got removed exception on non-obsolete entry: " + entry;

              if (log.isDebugEnabled())
                log.debug("Got removed entry in lockAsync(..) method (will retry): " + entry);
            }
          }

          // Mark mapping explicit lock flag.
          if (explicit) {
            boolean marked = tx != null && tx.markExplicit(node.id());

            assert tx == null || marked;
          }
        }

        if (!distributedKeys.isEmpty()) mapping.distributedKeys(distributedKeys);
        else {
          assert mapping.request() == null;

          iter.remove();
        }
      }

      cctx.mvcc().recheckPendingLocks();

      proceedMapping(mappings);
    } catch (GridException ex) {
      onError(ex);
    }
  }
示例#14
0
    /** @param res Result callback. */
    void onResult(GridNearLockResponse<K, V> res) {
      if (rcvRes.compareAndSet(false, true)) {
        if (res.error() != null) {
          if (log.isDebugEnabled())
            log.debug(
                "Finishing mini future with an error due to error in response [miniFut="
                    + this
                    + ", res="
                    + res
                    + ']');

          // Fail.
          if (res.error() instanceof GridCacheLockTimeoutException) onDone(false);
          else onDone(res.error());

          return;
        }

        int i = 0;

        long topVer = topSnapshot.get().topologyVersion();

        for (K k : keys) {
          while (true) {
            GridNearCacheEntry<K, V> entry = cctx.near().entryExx(k, topVer);

            try {
              if (res.dhtVersion(i) == null) {
                onDone(
                    new GridException(
                        "Failed to receive DHT version from remote node "
                            + "(will fail the lock): "
                            + res));

                return;
              }

              GridTuple3<GridCacheVersion, V, byte[]> oldValTup = valMap.get(entry.key());

              V oldVal = entry.rawGet();
              boolean hasOldVal = false;
              V newVal = res.value(i);
              byte[] newBytes = res.valueBytes(i);

              boolean readRecordable = false;

              if (retval) {
                readRecordable = cctx.events().isRecordable(EVT_CACHE_OBJECT_READ);

                if (readRecordable) hasOldVal = entry.hasValue();
              }

              GridCacheVersion dhtVer = res.dhtVersion(i);
              GridCacheVersion mappedVer = res.mappedVersion(i);

              if (newVal == null) {
                if (oldValTup != null) {
                  if (oldValTup.get1().equals(dhtVer)) {
                    newVal = oldValTup.get2();

                    newBytes = oldValTup.get3();
                  }

                  oldVal = oldValTup.get2();
                }
              }

              // Lock is held at this point, so we can set the
              // returned value if any.
              entry.resetFromPrimary(newVal, newBytes, lockVer, dhtVer, node.id());

              if (inTx() && implicitTx() && tx.onePhaseCommit()) {
                boolean pass = res.filterResult(i);

                tx.entry(k).filters(pass ? CU.<K, V>empty() : CU.<K, V>alwaysFalse());
              }

              entry.readyNearLock(
                  lockVer,
                  mappedVer,
                  res.committedVersions(),
                  res.rolledbackVersions(),
                  res.pending());

              if (retval) {
                if (readRecordable)
                  cctx.events()
                      .addEvent(
                          entry.partition(),
                          entry.key(),
                          tx,
                          null,
                          EVT_CACHE_OBJECT_READ,
                          newVal,
                          newVal != null || newBytes != null,
                          oldVal,
                          hasOldVal,
                          CU.subjectId(tx, cctx));

                cctx.cache().metrics0().onRead(false);
              }

              if (log.isDebugEnabled())
                log.debug("Processed response for entry [res=" + res + ", entry=" + entry + ']');

              break; // Inner while loop.
            } catch (GridCacheEntryRemovedException ignored) {
              if (log.isDebugEnabled())
                log.debug("Failed to add candidates because entry was removed (will renew).");

              // Replace old entry with new one.
              entries.set(i, (GridDistributedCacheEntry<K, V>) cctx.cache().entryEx(entry.key()));
            } catch (GridException e) {
              onDone(e);

              return;
            }
          }

          i++;
        }

        try {
          proceedMapping(mappings);
        } catch (GridException e) {
          onDone(e);
        }

        onDone(true);
      }
    }
  /**
   * 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);
    }
  }
  /**
   * @param nodeId Sender node ID.
   * @param req Finish transaction message.
   */
  @SuppressWarnings({"CatchGenericClass"})
  private void processFinishRequest(UUID nodeId, GridDistributedTxFinishRequest<K, V> req) {
    assert nodeId != null;
    assert req != null;

    GridReplicatedTxRemote<K, V> tx = ctx.tm().tx(req.version());

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

      if (req.commit()) {
        // If lock was acquired explicitly.
        if (tx == null) {
          // Create transaction and add entries.
          tx =
              ctx.tm()
                  .onCreated(
                      new GridReplicatedTxRemote<K, V>(
                          ldr,
                          nodeId,
                          req.threadId(),
                          req.version(),
                          req.commitVersion(),
                          PESSIMISTIC,
                          READ_COMMITTED,
                          req.isInvalidate(),
                          /*timeout */ 0,
                          /*read entries*/ null,
                          req.writes(),
                          ctx));

          if (tx == null || !ctx.tm().onStarted(tx))
            throw new GridCacheTxRollbackException(
                "Attempt to start a completed " + "transaction: " + req);
        } else {
          boolean set = tx.commitVersion(req.commitVersion());

          assert set;
        }

        Collection<GridCacheTxEntry<K, V>> writeEntries = req.writes();

        if (!F.isEmpty(writeEntries)) {
          // In OPTIMISTIC mode, we get the values at PREPARE stage.
          assert tx.concurrency() == PESSIMISTIC;

          for (GridCacheTxEntry<K, V> entry : writeEntries) {
            // Unmarshal write entries.
            entry.unmarshal(ctx, ldr);

            if (log.isDebugEnabled())
              log.debug(
                  "Unmarshalled transaction entry from pessimistic transaction [key="
                      + entry.key()
                      + ", value="
                      + entry.value()
                      + ", tx="
                      + tx
                      + ']');

            if (!tx.setWriteValue(entry))
              U.warn(
                  log,
                  "Received entry to commit that was not present in transaction [entry="
                      + entry
                      + ", tx="
                      + tx
                      + ']');
          }
        }

        // Add completed versions.
        tx.doneRemote(req.baseVersion(), req.committedVersions(), req.rolledbackVersions());

        if (tx.pessimistic()) tx.prepare();

        tx.commit();
      } else if (tx != null) {
        tx.doneRemote(req.baseVersion(), req.committedVersions(), req.rolledbackVersions());

        tx.rollback();
      }

      if (req.replyRequired()) {
        GridCacheMessage<K, V> res =
            new GridDistributedTxFinishResponse<K, V>(req.version(), req.futureId());

        try {
          ctx.io().send(nodeId, res);
        } catch (Throwable e) {
          // Double-check.
          if (ctx.discovery().node(nodeId) == null) {
            if (log.isDebugEnabled())
              log.debug(
                  "Node left while sending finish response [nodeId="
                      + nodeId
                      + ", res="
                      + res
                      + ']');
          } else
            U.error(
                log,
                "Failed to send finish response to node [nodeId=" + nodeId + ", res=" + res + ']',
                e);
        }
      }
    } catch (GridCacheTxRollbackException e) {
      if (log.isDebugEnabled())
        log.debug("Attempted to start a completed transaction (will ignore): " + e);
    } catch (Throwable e) {
      U.error(
          log,
          "Failed completing transaction [commit=" + req.commit() + ", tx=" + CU.txString(tx) + ']',
          e);

      if (tx != null) tx.rollback();
    }
  }
  /** Initializes future. */
  public void prepare() {
    if (log.isDebugEnabled())
      log.debug("Checking if transaction was committed on remote nodes: " + tx);

    // Check local node first (local node can be a backup node for some part of this transaction).
    long originatingThreadId = tx.threadId();

    if (tx instanceof GridCacheTxRemoteEx)
      originatingThreadId = ((GridCacheTxRemoteEx) tx).remoteThreadId();

    GridCacheCommittedTxInfo<K, V> txInfo =
        cctx.tm().txCommitted(tx.nearXidVersion(), tx.eventNodeId(), originatingThreadId);

    if (txInfo != null) {
      onDone(txInfo);

      markInitialized();

      return;
    }

    Collection<GridNode> checkNodes = CU.remoteNodes(cctx, tx.topologyVersion());

    if (tx instanceof GridDhtTxRemote) {
      // If we got primary node failure and near node has not failed.
      if (tx.nodeId().equals(failedNodeId) && !tx.eventNodeId().equals(failedNodeId)) {
        nearCheck = true;

        GridNode nearNode = cctx.discovery().node(tx.eventNodeId());

        if (nearNode == null) {
          // Near node failed, separate check prepared future will take care of it.
          onDone(
              new GridTopologyException(
                  "Failed to check near transaction state (near node left grid): "
                      + tx.eventNodeId()));

          return;
        }

        checkNodes = Collections.singletonList(nearNode);
      }
    }

    for (GridNode rmtNode : checkNodes) {
      // Skip left nodes and local node.
      if (rmtNode.id().equals(failedNodeId)) continue;

      /*
       * Send message to all cache nodes in the topology.
       */

      MiniFuture fut = new MiniFuture(rmtNode.id());

      GridCachePessimisticCheckCommittedTxRequest<K, V> req =
          new GridCachePessimisticCheckCommittedTxRequest<>(
              tx, originatingThreadId, futureId(), fut.futureId());

      add(fut);

      try {
        cctx.io().send(rmtNode.id(), req);
      } catch (GridTopologyException ignored) {
        fut.onNodeLeft();
      } catch (GridException e) {
        fut.onError(e);

        break;
      }
    }

    markInitialized();
  }