/**
* Processes lock request.
*
* @param nodeId Sender node ID.
* @param msg Lock request.
*/
@SuppressWarnings({"unchecked", "ThrowableInstanceNeverThrown"})
private void processLockRequest(UUID nodeId, GridDistributedLockRequest<K, V> msg) {
assert !nodeId.equals(locNodeId);
List<byte[]> keys = msg.keyBytes();
int cnt = keys.size();
GridReplicatedTxRemote<K, V> tx = null;
GridDistributedLockResponse res;
ClassLoader ldr = null;
try {
ldr = ctx.deploy().globalLoader();
if (ldr != null) {
res = new GridDistributedLockResponse(msg.version(), msg.futureId(), cnt);
for (int i = 0; i < keys.size(); i++) {
byte[] bytes = keys.get(i);
K key = msg.keys().get(i);
Collection<GridCacheMvccCandidate<K>> cands = msg.candidatesByIndex(i);
if (bytes == null) continue;
if (log.isDebugEnabled()) log.debug("Unmarshalled key: " + key);
GridDistributedCacheEntry<K, V> entry = null;
while (true) {
try {
entry = entryexx(key);
// Handle implicit locks for pessimistic transactions.
if (msg.inTx()) {
tx = ctx.tm().tx(msg.version());
if (tx != null) {
if (msg.txRead()) tx.addRead(key, bytes);
else tx.addWrite(key, bytes);
} else {
tx =
new GridReplicatedTxRemote<K, V>(
nodeId,
msg.threadId(),
msg.version(),
null,
PESSIMISTIC,
msg.isolation(),
msg.isInvalidate(),
msg.timeout(),
key,
bytes,
msg.txRead(),
ctx);
tx = ctx.tm().onCreated(tx);
if (tx == null || !ctx.tm().onStarted(tx))
throw new GridCacheTxRollbackException(
"Failed to acquire lock "
+ "(transaction has been completed): "
+ msg.version());
}
}
// Add remote candidate before reordering.
entry.addRemote(
msg.nodeId(),
null,
msg.threadId(),
msg.version(),
msg.timeout(),
tx != null && tx.ec(),
tx != null,
tx != null && tx.implicitSingle());
// Remote candidates for ordered lock queuing.
entry.addRemoteCandidates(
cands, msg.version(), msg.committedVersions(), msg.rolledbackVersions());
// Double-check in case if sender node left the grid.
if (ctx.discovery().node(msg.nodeId()) == null) {
if (log.isDebugEnabled())
log.debug(
"Node requesting lock left grid (lock request will be ignored): " + msg);
if (tx != null) tx.rollback();
return;
}
res.setCandidates(
i,
entry.localCandidates(),
ctx.tm().committedVersions(msg.version()),
ctx.tm().rolledbackVersions(msg.version()));
res.addValueBytes(
entry.rawGet(), msg.returnValue(i) ? entry.valueBytes(null) : null, ctx);
// 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 for message: " + msg;
U.warn(log, err);
res =
new GridDistributedLockResponse(msg.version(), msg.futureId(), new GridException(err));
}
} catch (GridCacheTxRollbackException e) {
if (log.isDebugEnabled())
log.debug("Received lock request for completed transaction (will ignore): " + e);
res = new GridDistributedLockResponse(msg.version(), msg.futureId(), e);
} catch (GridException e) {
String err = "Failed to unmarshal at least one of the keys for lock request message: " + msg;
log.error(err, e);
res =
new GridDistributedLockResponse(msg.version(), msg.futureId(), new GridException(err, e));
if (tx != null) tx.rollback();
} catch (GridDistributedLockCancelledException ignored) {
// Received lock request for cancelled lock.
if (log.isDebugEnabled())
log.debug("Received lock request for canceled lock (will ignore): " + msg);
if (tx != null) tx.rollback();
// Don't send response back.
return;
}
GridNode node = ctx.discovery().node(msg.nodeId());
boolean releaseAll = false;
if (node != null) {
try {
// Reply back to sender.
ctx.io().send(node, res);
} catch (GridException e) {
U.error(log, "Failed to send message to node (did the node leave grid?): " + node.id(), e);
releaseAll = ldr != null;
}
}
// If sender left grid, release all locks acquired so far.
else releaseAll = ldr != null;
// Release all locks because sender node left grid.
if (releaseAll) {
for (K key : msg.keys()) {
while (true) {
GridDistributedCacheEntry<K, V> entry = peekexx(key);
try {
if (entry != null) entry.removeExplicitNodeLocks(msg.nodeId());
break;
} catch (GridCacheEntryRemovedException ignore) {
if (log.isDebugEnabled())
log.debug(
"Attempted to remove lock on removed entity during failure "
+ "of replicated lock request handling (will retry): "
+ entry);
}
}
}
U.warn(
log, "Sender node left grid in the midst of lock acquisition (locks will be released).");
}
}
/**
* This method is called to map or split grid task into multiple grid jobs. This is the first
* method that gets called when task execution starts.
*
* @param data Task execution argument. Can be {@code null}. This is the same argument as the one
* passed into {@code Grid#execute(...)} methods.
* @param subgrid Nodes available for this task execution. Note that order of nodes is guaranteed
* to be randomized by container. This ensures that every time you simply iterate through grid
* nodes, the order of nodes will be random which over time should result into all nodes being
* used equally.
* @return Map of grid jobs assigned to subgrid node. Unless {@link
* GridComputeTaskContinuousMapper} is injected into task, if {@code null} or empty map is
* returned, exception will be thrown.
* @throws GridException If mapping could not complete successfully. This exception will be thrown
* out of {@link GridComputeTaskFuture#get()} method.
*/
@Override
public Map<? extends GridComputeJob, GridNode> map(
List<GridNode> subgrid, @Nullable final Collection<Integer> data) throws GridException {
assert !subgrid.isEmpty();
// Give preference to wanted node. Otherwise, take the first one.
GridNode targetNode =
F.find(
subgrid,
subgrid.get(0),
new GridPredicate<GridNode>() {
@Override
public boolean apply(GridNode e) {
return preferredNode.equals(e.id());
}
});
return Collections.singletonMap(
new GridComputeJobAdapter() {
@GridLoggerResource private GridLogger log;
@GridInstanceResource private Grid grid;
@Override
public Object execute() throws GridException {
log.info("Going to put data: " + data.size());
GridCache<Object, Object> cache = grid.cache(cacheName);
assert cache != null;
Map<Integer, T2<Integer, Collection<Integer>>> putMap = groupData(data);
for (Map.Entry<Integer, T2<Integer, Collection<Integer>>> entry : putMap.entrySet()) {
T2<Integer, Collection<Integer>> pair = entry.getValue();
Object affKey = pair.get1();
// Group lock partition.
try (GridCacheTx tx =
cache.txStartPartition(
cache.affinity().partition(affKey),
optimistic ? OPTIMISTIC : PESSIMISTIC,
REPEATABLE_READ,
0,
pair.get2().size())) {
for (Integer val : pair.get2()) cache.put(val, val);
tx.commit();
}
}
log.info("Finished put data: " + data.size());
return data;
}
/**
* Groups values by partitions.
*
* @param data Data to put.
* @return Grouped map.
*/
private Map<Integer, T2<Integer, Collection<Integer>>> groupData(Iterable<Integer> data) {
GridCache<Object, Object> cache = grid.cache(cacheName);
Map<Integer, T2<Integer, Collection<Integer>>> res = new HashMap<>();
for (Integer val : data) {
int part = cache.affinity().partition(val);
T2<Integer, Collection<Integer>> tup = res.get(part);
if (tup == null) {
tup = new T2<Integer, Collection<Integer>>(val, new LinkedList<Integer>());
res.put(part, tup);
}
tup.get2().add(val);
}
return res;
}
},
targetNode);
}