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ONOS-1965: Evict inactive nodes from candidates map + Rely on cluster events to trigger stale lock purge

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Change-Id: Ib7cfea397f98d6271beb78e3b88041bb84550506
This commit is contained in:
Madan Jampani 2015-05-18 16:19:27 -07:00
parent cd38ba5f56
commit cc58675360
1 changed files with 86 additions and 15 deletions
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101
core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DistributedLeadershipManager.java vendored
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@ -13,6 +13,9 @@ import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.apache.felix.scr.annotations.Service;
import org.onlab.util.KryoNamespace;
import org.onosproject.cluster.ClusterEvent;
import org.onosproject.cluster.ClusterEvent.Type;
import org.onosproject.cluster.ClusterEventListener;
import org.onosproject.cluster.ClusterService;
import org.onosproject.cluster.Leadership;
import org.onosproject.cluster.LeadershipEvent;
@ -32,6 +35,7 @@ import org.onosproject.store.service.Versioned;
import org.slf4j.Logger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
@ -55,7 +59,7 @@ import static org.onosproject.cluster.ControllerNode.State.INACTIVE;
/**
* Distributed Lock Manager implemented on top of ConsistentMap.
* <p>
* This implementation makes use of cluster manager's failure
* This implementation makes use of ClusterService's failure
* detection capabilities to detect and purge stale locks.
* TODO: Ensure lock safety and liveness.
*/
@ -81,27 +85,28 @@ public class DistributedLeadershipManager implements LeadershipService {
private final Logger log = getLogger(getClass());
private ExecutorService messageHandlingExecutor;
private ScheduledExecutorService retryLeaderLockExecutor;
private ScheduledExecutorService deadLockDetectionExecutor;
private ScheduledExecutorService staleLeadershipPurgeExecutor;
private ScheduledExecutorService leadershipStatusBroadcaster;
private ConsistentMap<String, NodeId> leaderMap;
private ConsistentMap<String, List<NodeId>> candidateMap;
private ListenerRegistry<LeadershipEvent, LeadershipEventListener>
listenerRegistry;
private ListenerRegistry<LeadershipEvent, LeadershipEventListener> listenerRegistry;
private final Map<String, Leadership> leaderBoard = Maps.newConcurrentMap();
private final Map<String, Leadership> candidateBoard = Maps.newConcurrentMap();
private NodeId localNodeId;
private final ClusterEventListener clusterEventListener = new InternalClusterEventListener();
private NodeId localNodeId;
private Set<String> activeTopics = Sets.newConcurrentHashSet();
private static final int ELECTION_JOIN_ATTEMPT_INTERVAL_SEC = 2;
private static final int DELAY_BETWEEN_LEADER_LOCK_ATTEMPTS_SEC = 2;
private static final int DEADLOCK_DETECTION_INTERVAL_SEC = 2;
private static final int LEADERSHIP_STATUS_UPDATE_INTERVAL_SEC = 2;
private static final int DELAY_BETWEEN_STALE_LEADERSHIP_PURGE_ATTEMPTS_SEC = 2;
private static final int LEADER_CANDIDATE_POS = 0;
private final AtomicBoolean staleLeadershipPurgeScheduled = new AtomicBoolean(false);
private static final Serializer SERIALIZER = Serializer.using(
new KryoNamespace.Builder().register(KryoNamespaces.API).build());
@ -122,8 +127,8 @@ public class DistributedLeadershipManager implements LeadershipService {
groupedThreads("onos/store/leadership", "message-handler"));
retryLeaderLockExecutor = Executors.newScheduledThreadPool(
4, groupedThreads("onos/store/leadership", "election-thread-%d"));
deadLockDetectionExecutor = Executors.newSingleThreadScheduledExecutor(
groupedThreads("onos/store/leadership", "dead-lock-detector"));
staleLeadershipPurgeExecutor = Executors.newSingleThreadScheduledExecutor(
groupedThreads("onos/store/leadership", "stale-leadership-evictor"));
leadershipStatusBroadcaster = Executors.newSingleThreadScheduledExecutor(
groupedThreads("onos/store/leadership", "peer-updater"));
clusterCommunicator.addSubscriber(
@ -132,8 +137,8 @@ public class DistributedLeadershipManager implements LeadershipService {
this::onLeadershipEvent,
messageHandlingExecutor);
deadLockDetectionExecutor.scheduleWithFixedDelay(
this::purgeStaleLocks, 0, DEADLOCK_DETECTION_INTERVAL_SEC, TimeUnit.SECONDS);
clusterService.addListener(clusterEventListener);
leadershipStatusBroadcaster.scheduleWithFixedDelay(
this::sendLeadershipStatus, 0, LEADERSHIP_STATUS_UPDATE_INTERVAL_SEC, TimeUnit.SECONDS);
@ -151,12 +156,13 @@ public class DistributedLeadershipManager implements LeadershipService {
}
});
clusterService.removeListener(clusterEventListener);
eventDispatcher.removeSink(LeadershipEvent.class);
clusterCommunicator.removeSubscriber(LEADERSHIP_EVENT_MESSAGE_SUBJECT);
messageHandlingExecutor.shutdown();
retryLeaderLockExecutor.shutdown();
deadLockDetectionExecutor.shutdown();
staleLeadershipPurgeExecutor.shutdown();
leadershipStatusBroadcaster.shutdown();
log.info("Stopped");
@ -508,12 +514,25 @@ public class DistributedLeadershipManager implements LeadershipService {
TimeUnit.SECONDS);
}
private void purgeStaleLocks() {
private void scheduleStaleLeadershipPurge(int afterDelaySec) {
if (staleLeadershipPurgeScheduled.compareAndSet(false, true)) {
staleLeadershipPurgeExecutor.schedule(
this::purgeStaleLeadership,
afterDelaySec,
TimeUnit.SECONDS);
}
}
/**
* Purges locks held by inactive nodes and evicts inactive nodes from candidacy.
*/
private void purgeStaleLeadership() {
AtomicBoolean rerunPurge = new AtomicBoolean(false);
try {
staleLeadershipPurgeScheduled.set(false);
leaderMap.entrySet()
.stream()
.filter(e -> clusterService.getState(e.getValue().value()) == INACTIVE)
.filter(e -> activeTopics.contains(e.getKey()))
.forEach(entry -> {
String path = entry.getKey();
NodeId nodeId = entry.getValue().value();
@ -528,10 +547,52 @@ public class DistributedLeadershipManager implements LeadershipService {
}
} catch (Exception e) {
log.warn("Failed to purge stale lock held by {} for {}", nodeId, path, e);
rerunPurge.set(true);
}
});
candidateMap.entrySet()
.forEach(entry -> {
String path = entry.getKey();
Versioned<List<NodeId>> candidates = entry.getValue();
List<NodeId> candidatesList = candidates != null
? candidates.value() : Collections.emptyList();
List<NodeId> activeCandidatesList =
candidatesList.stream()
.filter(n -> clusterService.getState(n) == ACTIVE)
.filter(n -> !localNodeId.equals(n) || activeTopics.contains(path))
.collect(Collectors.toList());
if (activeCandidatesList.size() < candidatesList.size()) {
Set<NodeId> removedCandidates =
Sets.difference(Sets.newHashSet(candidatesList),
Sets.newHashSet(activeCandidatesList));
try {
if (candidateMap.replace(path, entry.getValue().version(), activeCandidatesList)) {
log.info("Evicted inactive candidates {} from "
+ "candidate list for {}", removedCandidates, path);
Versioned<List<NodeId>> updatedCandidates = candidateMap.get(path);
publish(new LeadershipEvent(
LeadershipEvent.Type.CANDIDATES_CHANGED,
new Leadership(path,
updatedCandidates.value(),
updatedCandidates.version(),
updatedCandidates.creationTime())));
}
} catch (Exception e) {
log.warn("Failed to evict inactive candidates {} from "
+ "candidate list for {}", removedCandidates, path, e);
rerunPurge.set(true);
}
}
});
} catch (Exception e) {
log.debug("Failed cleaning up stale locks", e);
log.warn("Failure purging state leadership.", e);
rerunPurge.set(true);
}
if (rerunPurge.get()) {
log.info("Rescheduling stale leadership purge due to errors encountered in previous run");
scheduleStaleLeadershipPurge(DELAY_BETWEEN_STALE_LEADERSHIP_PURGE_ATTEMPTS_SEC);
}
}
@ -555,4 +616,14 @@ public class DistributedLeadershipManager implements LeadershipService {
log.debug("Failed to send leadership updates", e);
}
}
private class InternalClusterEventListener implements ClusterEventListener {
@Override
public void event(ClusterEvent event) {
if (event.type() == Type.INSTANCE_DEACTIVATED || event.type() == Type.INSTANCE_REMOVED) {
scheduleStaleLeadershipPurge(0);
}
}
}
}