/** {@inheritDoc} */
@Override
public GridCacheEntryEx<K, V> entryEx(K key) {
GridNearCacheEntry<K, V> entry = null;
while (true) {
try {
entry = (GridNearCacheEntry<K, V>) super.entryEx(key);
entry.initializeFromDht();
return entry;
} catch (GridCacheEntryRemovedException ignore) {
if (log.isDebugEnabled())
log.debug(
"Got removed near entry while initializing from DHT entry (will retry): " + entry);
}
}
}
/**
* Adds entry to future.
*
* @param topVer Topology version.
* @param entry Entry to add.
* @param dhtNodeId DHT node ID.
* @return Lock candidate.
* @throws GridCacheEntryRemovedException If entry was removed.
*/
@Nullable
private GridCacheMvccCandidate<K> addEntry(
long topVer, GridNearCacheEntry<K, V> entry, UUID dhtNodeId)
throws GridCacheEntryRemovedException {
// Check if lock acquisition is timed out.
if (timedOut) return null;
// Add local lock first, as it may throw GridCacheEntryRemovedException.
GridCacheMvccCandidate<K> c =
entry.addNearLocal(
dhtNodeId, threadId, lockVer, timeout, !inTx(), inTx(), implicitSingleTx());
if (inTx()) {
GridCacheTxEntry<K, V> txEntry = tx.entry(entry.key());
txEntry.cached(entry, txEntry.keyBytes());
}
if (c != null) c.topologyVersion(topVer);
synchronized (mux) {
entries.add(entry);
}
if (c == null && timeout < 0) {
if (log.isDebugEnabled()) log.debug("Failed to acquire lock with negative timeout: " + entry);
onFailed(false);
return null;
}
// Double check if lock acquisition has already timed out.
if (timedOut) {
entry.removeLock(lockVer);
return null;
}
return c;
}
/**
* @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> startRemoteTx(UUID nodeId, GridDhtLockRequest<K, V> req)
throws GridException, GridDistributedLockCancelledException {
List<byte[]> nearKeyBytes = req.nearKeyBytes();
GridNearTxRemote<K, V> tx = null;
ClassLoader ldr = ctx.deploy().globalLoader();
if (ldr != null) {
for (int i = 0; i < nearKeyBytes.size(); i++) {
byte[] bytes = nearKeyBytes.get(i);
if (bytes == null) continue;
K key = req.nearKeys().get(i);
Collection<GridCacheMvccCandidate<K>> cands = req.candidatesByIndex(i);
if (log.isDebugEnabled()) log.debug("Unmarshalled key: " + key);
GridNearCacheEntry<K, V> entry = null;
while (true) {
try {
entry = peekExx(key);
if (entry != null) {
entry.keyBytes(bytes);
// Handle implicit locks for pessimistic transactions.
if (req.inTx()) {
tx = ctx.tm().tx(req.version());
if (tx != null) tx.addWrite(key, bytes, null /*Value.*/, null /*Value bytes.*/);
else {
tx =
new GridNearTxRemote<K, V>(
nodeId,
req.nearNodeId(),
req.threadId(),
req.version(),
null,
PESSIMISTIC,
req.isolation(),
req.isInvalidate(),
req.timeout(),
key,
bytes,
null, // Value.
null, // Value bytes.
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());
}
}
// Add remote candidate before reordering.
entry.addRemote(
req.nodeId(),
nodeId,
req.threadId(),
req.version(),
req.timeout(),
tx != null && tx.ec(),
tx != null,
tx != null && tx.implicitSingle());
// Remote candidates for ordered lock queuing.
entry.addRemoteCandidates(
cands, req.version(), req.committedVersions(), req.rolledbackVersions());
entry.orderOwned(req.version(), req.owned(entry.key()));
}
// Double-check in case if sender node left the grid.
if (ctx.discovery().node(req.nodeId()) == 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;
}
/**
* 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);
}
}
/** @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);
}
}