package org.opendaylight.controller.cluster.databroker.actors.dds;
import static com.google.common.base.Preconditions.checkState;
+import static com.google.common.base.Verify.verify;
+import static com.google.common.base.Verify.verifyNotNull;
import static java.util.Objects.requireNonNull;
import akka.actor.ActorRef;
-import com.google.common.base.Verify;
+import com.google.common.collect.ImmutableList;
+import com.google.common.primitives.UnsignedLong;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
+import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import org.opendaylight.controller.cluster.access.commands.DestroyLocalHistoryRequest;
import org.opendaylight.controller.cluster.access.commands.LocalHistoryRequest;
import org.opendaylight.controller.cluster.access.commands.PurgeLocalHistoryRequest;
+import org.opendaylight.controller.cluster.access.commands.SkipTransactionsRequest;
import org.opendaylight.controller.cluster.access.commands.TransactionRequest;
import org.opendaylight.controller.cluster.access.concepts.LocalHistoryIdentifier;
import org.opendaylight.controller.cluster.access.concepts.Request;
import org.opendaylight.controller.cluster.access.concepts.Response;
import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
import org.opendaylight.yangtools.concepts.Identifiable;
-import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
-import org.opendaylight.yangtools.yang.data.api.schema.tree.ReadOnlyDataTree;
+import org.opendaylight.yangtools.yang.data.tree.api.DataTreeSnapshot;
+import org.opendaylight.yangtools.yang.data.tree.api.ReadOnlyDataTree;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Override
void onTransactionCompleted(final AbstractProxyTransaction tx) {
- Verify.verify(tx instanceof LocalProxyTransaction);
+ verify(tx instanceof LocalProxyTransaction, "Unexpected transaction %s", tx);
if (tx instanceof LocalReadWriteProxyTransaction
&& LAST_SEALED_UPDATER.compareAndSet(this, (LocalReadWriteProxyTransaction) tx, null)) {
LOG.debug("Completed last sealed transaction {}", tx);
final ConnectionEntry e = it.next();
final Request<?, ?> req = e.getRequest();
if (identifier.equals(req.getTarget())) {
- Verify.verify(req instanceof LocalHistoryRequest);
+ verify(req instanceof LocalHistoryRequest, "Unexpected request %s", req);
if (req instanceof CreateLocalHistoryRequest) {
successor.connection.enqueueRequest(req, e.getCallback(), e.getEnqueuedTicks());
it.remove();
t.replayMessages(successor, previousEntries);
}
+ // Forward any skipped transactions
+ final var local = skippedTransactions;
+ if (local != null) {
+ LOG.debug("{} forwarding skipped transactions towards successor {}", identifier, successor);
+ successor.skipTransactions(local);
+ skippedTransactions = null;
+ }
+
// Now look for any finalizing messages
it = previousEntries.iterator();
while (it.hasNext()) {
final ConnectionEntry e = it.next();
final Request<?, ?> req = e.getRequest();
if (identifier.equals(req.getTarget())) {
- Verify.verify(req instanceof LocalHistoryRequest);
+ verify(req instanceof LocalHistoryRequest, "Unexpected request %s", req);
if (req instanceof DestroyLocalHistoryRequest) {
successor.connection.enqueueRequest(req, e.getCallback(), e.getEnqueuedTicks());
it.remove();
}
}
- @GuardedBy("lock")
+ @Holding("lock")
@Override
ProxyHistory finishReconnect() {
- final ProxyHistory ret = Verify.verifyNotNull(successor);
+ final ProxyHistory ret = verifyNotNull(successor);
for (AbstractProxyTransaction t : proxies.values()) {
t.finishReconnect();
@GuardedBy("lock")
private ProxyHistory successor;
+ // List of transaction identifiers which were allocated by our parent history, but did not touch our shard. Each of
+ // these represents a hole in otherwise-contiguous allocation of transactionIds. These holes are problematic, as
+ // each of them prevents LeaderFrontendState.purgedHistories from coalescing, leading to a gradual heap exhaustion.
+ //
+ // <p>
+ // We keep these in an ArrayList for fast insertion, as that happens when we are otherwise idle. We translate these
+ // into purge requests when:
+ // - we are about to allocate a new transaction
+ // - we get a successor proxy
+ // - the list grows unreasonably long
+ //
+ // TODO: we are tracking entire TransactionIdentifiers, but really only need to track the longs. Do that once we
+ // have a {@code List<long>}.
+ // FIXME: this is not tuneable, but perhaps should be
+ // FIXME: default value deserves some explanation -- this affects depth of an RB Tree on the receiving end.
+ private static final int PURGE_SKIPPED_TXID_THRESHOLD = 256;
+
+ @GuardedBy("lock")
+ private volatile List<TransactionIdentifier> skippedTransactions;
+
private ProxyHistory(final AbstractClientHistory parent,
final AbstractClientConnection<ShardBackendInfo> connection, final LocalHistoryIdentifier identifier) {
this.parent = requireNonNull(parent);
static ProxyHistory createClient(final AbstractClientHistory parent,
final AbstractClientConnection<ShardBackendInfo> connection, final LocalHistoryIdentifier identifier) {
final Optional<ReadOnlyDataTree> dataTree = connection.getBackendInfo().flatMap(ShardBackendInfo::getDataTree);
- return dataTree.isPresent() ? new Local(parent, connection, identifier, dataTree.get())
+ return dataTree.isPresent() ? new Local(parent, connection, identifier, dataTree.orElseThrow())
: new Remote(parent, connection, identifier);
}
final AbstractClientConnection<ShardBackendInfo> connection,
final LocalHistoryIdentifier identifier) {
final Optional<ReadOnlyDataTree> dataTree = connection.getBackendInfo().flatMap(ShardBackendInfo::getDataTree);
- return dataTree.isPresent() ? new LocalSingle(parent, connection, identifier, dataTree.get())
+ return dataTree.isPresent() ? new LocalSingle(parent, connection, identifier, dataTree.orElseThrow())
: new RemoteSingle(parent, connection, identifier);
}
@Override
+ // Non-final for mocking
public LocalHistoryIdentifier getIdentifier() {
return identifier;
}
return createTransactionProxy(txId, snapshotOnly, false);
}
+ // Non-final for mocking
AbstractProxyTransaction createTransactionProxy(final TransactionIdentifier txId, final boolean snapshotOnly,
final boolean isDone) {
lock.lock();
}
}
+ final void skipTransaction(final TransactionIdentifier txId) {
+ lock.lock();
+ try {
+ if (successor != null) {
+ successor.skipTransaction(txId);
+ return;
+ }
+
+ var local = skippedTransactions;
+ if (local == null) {
+ skippedTransactions = local = new ArrayList<>();
+ }
+ local.add(txId);
+ LOG.debug("Recorded skipped transaction {}", txId);
+ skipIfNeeded(local);
+ } finally {
+ lock.unlock();
+ }
+ }
+
+ @Holding("lock")
+ private void skipIfNeeded(final List<TransactionIdentifier> current) {
+ if (current.size() >= PURGE_SKIPPED_TXID_THRESHOLD) {
+ skippedTransactions = null;
+ doSkipTransactions(current);
+ }
+ }
+
+ private void skipTransactions(final List<TransactionIdentifier> toSkip) {
+ lock.lock();
+ try {
+ if (successor != null) {
+ successor.skipTransactions(toSkip);
+ return;
+ }
+
+ var local = skippedTransactions;
+ if (local != null) {
+ local.addAll(toSkip);
+ } else {
+ skippedTransactions = local = toSkip;
+ }
+ skipIfNeeded(local);
+ } finally {
+ lock.unlock();
+ }
+ }
+
+ private void skipTransactions() {
+ var local = skippedTransactions;
+ if (local != null) {
+ lock.lock();
+ try {
+ local = skippedTransactions;
+ if (local != null && successor == null) {
+ skippedTransactions = null;
+ doSkipTransactions(local);
+ }
+ } finally {
+ lock.unlock();
+ }
+ }
+ }
+
+ @Holding("lock")
+ private void doSkipTransactions(final List<TransactionIdentifier> toSkip) {
+ final var txIds = toSkip.stream()
+ .mapToLong(TransactionIdentifier::getTransactionId)
+ .distinct()
+ .sorted()
+ .mapToObj(UnsignedLong::fromLongBits)
+ .collect(ImmutableList.toImmutableList());
+
+ LOG.debug("Proxy {} skipping transactions {}", this, txIds);
+ connection.enqueueRequest(new SkipTransactionsRequest(new TransactionIdentifier(identifier,
+ txIds.get(0).longValue()), 0, localActor(),txIds.subList(1, txIds.size())), resp -> {
+ LOG.debug("Proxy {} confirmed transaction skip", this);
+ }, connection.currentTime());
+ }
+
final void abortTransaction(final AbstractProxyTransaction tx) {
lock.lock();
try {
}
}
- void purgeTransaction(final AbstractProxyTransaction tx) {
+ final void purgeTransaction(final AbstractProxyTransaction tx) {
lock.lock();
try {
proxies.remove(tx.getIdentifier());
final void enqueueRequest(final TransactionRequest<?> request, final Consumer<Response<?, ?>> callback,
final long enqueuedTicks) {
+ skipTransactions();
connection.enqueueRequest(request, callback, enqueuedTicks);
}
final void sendRequest(final TransactionRequest<?> request, final Consumer<Response<?, ?>> callback) {
+ skipTransactions();
connection.sendRequest(request, callback);
}
abstract ProxyHistory createSuccessor(AbstractClientConnection<ShardBackendInfo> connection);
@SuppressFBWarnings(value = "UL_UNRELEASED_LOCK", justification = "Lock is released asynchronously via the cohort")
- ProxyReconnectCohort startReconnect(final ConnectedClientConnection<ShardBackendInfo> newConnection) {
+ final ProxyReconnectCohort startReconnect(final ConnectedClientConnection<ShardBackendInfo> newConnection) {
lock.lock();
if (successor != null) {
lock.unlock();
// No-op for most implementations
}
+ @Holding("lock")
void onTransactionSealed(final AbstractProxyTransaction tx) {
// No-op on most implementations
}
Code Review / controller.git / blobdiff