X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2FShardManager.java;h=64c6821120f94f99a389c12700757a7b8c7266f5;hb=aa16c6b860255d4509f240fbcb416b8d3d6c0232;hp=3e0c97f6afb8e33d1c9b580f4a96111d2a3b6884;hpb=fe4049d34de103016d11f3a9050853c6380646d3;p=controller.git

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java
index 3e0c97f6af..64c6821120 100644
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardManager.java
@@ -11,14 +11,22 @@ package org.opendaylight.controller.cluster.datastore;
 import akka.actor.ActorPath;
 import akka.actor.ActorRef;
 import akka.actor.Address;
+import akka.actor.OneForOneStrategy;
 import akka.actor.Props;
-import akka.event.Logging;
-import akka.event.LoggingAdapter;
+import akka.actor.SupervisorStrategy;
+import akka.cluster.ClusterEvent;
 import akka.japi.Creator;
+import akka.japi.Function;
+import com.google.common.base.Preconditions;
+import org.opendaylight.controller.cluster.datastore.messages.FindLocalShard;
 import org.opendaylight.controller.cluster.datastore.messages.FindPrimary;
+import org.opendaylight.controller.cluster.datastore.messages.LocalShardFound;
+import org.opendaylight.controller.cluster.datastore.messages.LocalShardNotFound;
+import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved;
 import org.opendaylight.controller.cluster.datastore.messages.PrimaryFound;
 import org.opendaylight.controller.cluster.datastore.messages.PrimaryNotFound;
 import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
+import scala.concurrent.duration.Duration;
 
 import java.util.HashMap;
 import java.util.List;
@@ -26,47 +34,27 @@ import java.util.Map;
 
 /**
  * The ShardManager has the following jobs,
- * <p>
+ * <ul>
  * <li> Create all the local shard replicas that belong on this cluster member
+ * <li> Find the address of the local shard
  * <li> Find the primary replica for any given shard
- * <li> Engage in shard replica elections which decide which replica should be the primary
- * </p>
- * <p/>
- * <h3>>Creation of Shard replicas</h3
- * <p>
- * When the ShardManager is constructed it reads the cluster configuration to find out which shard replicas
- * belong on this member. It finds out the name of the current cluster member from the Akka Clustering Service.
- * </p>
- * <p/>
- * <h3> Replica Elections </h3>
- * <p/>
- * <p>
- * The Shard Manager uses multiple cues to initiate election.
- * <li> When a member of the cluster dies
- * <li> When a local shard replica dies
- * <li> When a local shard replica comes alive
- * </p>
+ * <li> Monitor the cluster members and store their addresses
+ * <ul>
  */
 public class ShardManager extends AbstractUntypedActor {
 
-    // Stores a mapping between a shard name and the address of the current primary
-    private final Map<String, Address> shardNameToPrimaryAddress =
-        new HashMap<>();
-
     // Stores a mapping between a member name and the address of the member
+    // Member names look like "member-1", "member-2" etc and are as specified
+    // in configuration
     private final Map<String, Address> memberNameToAddress = new HashMap<>();
 
-    // Stores a mapping between the shard name and all the members on which a replica of that shard are available
-    private final Map<String, List<String>> shardNameToMembers =
-        new HashMap<>();
-
-    private final LoggingAdapter log =
-        Logging.getLogger(getContext().system(), this);
-
-
-    private final Map<String, ActorPath> localShards = new HashMap<>();
-
+    // Stores a mapping between a shard name and it's corresponding information
+    // Shard names look like inventory, topology etc and are as specified in
+    // configuration
+    private final Map<String, ShardInformation> localShards = new HashMap<>();
 
+    // The type of a ShardManager reflects the type of the datastore itself
+    // A data store could be of type config/operational
     private final String type;
 
     private final ClusterWrapper cluster;
@@ -78,20 +66,17 @@ public class ShardManager extends AbstractUntypedActor {
      *             configuration or operational
      */
     private ShardManager(String type, ClusterWrapper cluster, Configuration configuration) {
-        this.type = type;
-        this.cluster = cluster;
-        this.configuration = configuration;
-        String memberName = cluster.getCurrentMemberName();
-        List<String> memberShardNames =
-            configuration.getMemberShardNames(memberName);
 
-        for(String shardName : memberShardNames){
-            String shardActorName = getShardActorName(memberName, shardName);
-            ActorRef actor = getContext()
-                .actorOf(Shard.props(shardActorName), shardActorName);
-            ActorPath path = actor.path();
-            localShards.put(shardName, path);
-        }
+        this.type = Preconditions.checkNotNull(type, "type should not be null");
+        this.cluster = Preconditions.checkNotNull(cluster, "cluster should not be null");
+        this.configuration = Preconditions.checkNotNull(configuration, "configuration should not be null");
+
+        // Subscribe this actor to cluster member events
+        cluster.subscribeToMemberEvents(getSelf());
+
+        // Create all the local Shards and make them a child of the ShardManager
+        // TODO: This may need to be initiated when we first get the schema context
+        createLocalShards();
     }
 
     public static Props props(final String type,
@@ -106,55 +91,233 @@ public class ShardManager extends AbstractUntypedActor {
         });
     }
 
+
     @Override
     public void handleReceive(Object message) throws Exception {
-        if (message instanceof FindPrimary) {
-            FindPrimary msg = ((FindPrimary) message);
-            String shardName = msg.getShardName();
-
-            List<String> members =
-                configuration.getMembersFromShardName(shardName);
-
-            for(String memberName : members) {
-                if (memberName.equals(cluster.getCurrentMemberName())) {
-                    // This is a local shard
-                    ActorPath shardPath = localShards.get(shardName);
-                    // FIXME: This check may be redundant
-                    if (shardPath == null) {
-                        getSender()
-                            .tell(new PrimaryNotFound(shardName), getSelf());
-                        return;
-                    }
-                    getSender().tell(new PrimaryFound(shardPath.toString()),
-                        getSelf());
-                    return;
-                } else {
-                    Address address = memberNameToAddress.get(shardName);
-                    if(address != null){
-                        String path =
-                            address.toString() + "/user/" + getShardActorName(
-                                memberName, shardName);
-                        getSender().tell(new PrimaryFound(path), getSelf());
-                    }
+        if (message.getClass().equals(FindPrimary.SERIALIZABLE_CLASS)) {
+            findPrimary(
+                FindPrimary.fromSerializable(message));
+        } else if(message instanceof FindLocalShard){
+            findLocalShard((FindLocalShard) message);
+        } else if (message instanceof UpdateSchemaContext) {
+            updateSchemaContext(message);
+        } else if (message instanceof ClusterEvent.MemberUp){
+            memberUp((ClusterEvent.MemberUp) message);
+        } else if(message instanceof ClusterEvent.MemberRemoved) {
+            memberRemoved((ClusterEvent.MemberRemoved) message);
+        } else if(message instanceof ClusterEvent.UnreachableMember) {
+            ignoreMessage(message);
+        } else{
+          throw new Exception ("Not recognized message received, message="+message);
+        }
 
+    }
 
-                }
+    private void findLocalShard(FindLocalShard message) {
+        ShardInformation shardInformation =
+            localShards.get(message.getShardName());
+
+        if(shardInformation != null){
+            getSender().tell(new LocalShardFound(shardInformation.getActor()), getSelf());
+            return;
+        }
+
+        getSender().tell(new LocalShardNotFound(message.getShardName()), getSelf());
+    }
+
+    private void ignoreMessage(Object message){
+        LOG.debug("Unhandled message : " + message);
+    }
+
+    private void memberRemoved(ClusterEvent.MemberRemoved message) {
+        memberNameToAddress.remove(message.member().roles().head());
+    }
+
+    private void memberUp(ClusterEvent.MemberUp message) {
+        String memberName = message.member().roles().head();
+
+        memberNameToAddress.put(memberName , message.member().address());
+
+        for(ShardInformation info : localShards.values()){
+            String shardName = info.getShardName();
+            info.updatePeerAddress(getShardActorName(memberName, shardName),
+                getShardActorPath(shardName, memberName));
+        }
+    }
+
+    /**
+     * Notifies all the local shards of a change in the schema context
+     *
+     * @param message
+     */
+    private void updateSchemaContext(Object message) {
+        for(ShardInformation info : localShards.values()){
+            info.getActor().tell(message,getSelf());
+        }
+    }
+
+    private void findPrimary(FindPrimary message) {
+        String shardName = message.getShardName();
+
+        List<String> members =
+            configuration.getMembersFromShardName(shardName);
+
+        // First see if the there is a local replica for the shard
+        ShardInformation info = localShards.get(shardName);
+        if(info != null) {
+            ActorPath shardPath = info.getActorPath();
+            if (shardPath != null) {
+                getSender()
+                    .tell(
+                        new PrimaryFound(shardPath.toString()).toSerializable(),
+                        getSelf());
+                return;
             }
+        }
 
-            getSender().tell(new PrimaryNotFound(shardName), getSelf());
+        if(cluster.getCurrentMemberName() != null) {
+            members.remove(cluster.getCurrentMemberName());
+        }
 
-        } else if (message instanceof UpdateSchemaContext) {
-            for(ActorPath path : localShards.values()){
-                getContext().system().actorSelection(path)
-                    .forward(message,
-                        getContext());
+        // There is no way for us to figure out the primary (for now) so assume
+        // that one of the remote nodes is a primary
+        for(String memberName : members) {
+            Address address = memberNameToAddress.get(memberName);
+            if(address != null){
+                String path =
+                    getShardActorPath(shardName, memberName);
+                getSender().tell(new PrimaryFound(path).toSerializable(), getSelf());
+                return;
             }
         }
+        getSender().tell(new PrimaryNotFound(shardName).toSerializable(), getSelf());
     }
 
+    private String getShardActorPath(String shardName, String memberName) {
+        Address address = memberNameToAddress.get(memberName);
+        if(address != null) {
+            return address.toString() + "/user/shardmanager-" + this.type + "/"
+                + getShardActorName(
+                memberName, shardName);
+        }
+        return null;
+    }
+
+    /**
+     * Construct the name of the shard actor given the name of the member on
+     * which the shard resides and the name of the shard
+     *
+     * @param memberName
+     * @param shardName
+     * @return
+     */
     private String getShardActorName(String memberName, String shardName){
         return memberName + "-shard-" + shardName + "-" + this.type;
     }
 
+    /**
+     * Create shards that are local to the member on which the ShardManager
+     * runs
+     *
+     */
+    private void createLocalShards() {
+        String memberName = this.cluster.getCurrentMemberName();
+        List<String> memberShardNames =
+            this.configuration.getMemberShardNames(memberName);
+
+        for(String shardName : memberShardNames){
+            String shardActorName = getShardActorName(memberName, shardName);
+            Map<String, String> peerAddresses = getPeerAddresses(shardName);
+            ActorRef actor = getContext()
+                .actorOf(Shard.props(shardActorName, peerAddresses),
+                    shardActorName);
+            localShards.put(shardName, new ShardInformation(shardName, actor, peerAddresses));
+        }
+
+    }
+
+    /**
+     * Given the name of the shard find the addresses of all it's peers
+     *
+     * @param shardName
+     * @return
+     */
+    private Map<String, String> getPeerAddresses(String shardName){
+
+        Map<String, String> peerAddresses = new HashMap<>();
+
+        List<String> members =
+            this.configuration.getMembersFromShardName(shardName);
+
+        String currentMemberName = this.cluster.getCurrentMemberName();
+
+        for(String memberName : members){
+            if(!currentMemberName.equals(memberName)){
+                String shardActorName = getShardActorName(memberName, shardName);
+                String path =
+                    getShardActorPath(shardName, currentMemberName);
+                peerAddresses.put(shardActorName, path);
+            }
+        }
+        return peerAddresses;
+    }
+
+
+    @Override
+    public SupervisorStrategy supervisorStrategy() {
+        return new OneForOneStrategy(10, Duration.create("1 minute"),
+            new Function<Throwable, SupervisorStrategy.Directive>() {
+                @Override
+                public SupervisorStrategy.Directive apply(Throwable t) {
+                    return SupervisorStrategy.resume();
+                }
+            }
+        );
+
+    }
+
+    private class ShardInformation {
+        private final String shardName;
+        private final ActorRef actor;
+        private final ActorPath actorPath;
+        private final Map<String, String> peerAddresses;
+
+        private ShardInformation(String shardName, ActorRef actor,
+            Map<String, String> peerAddresses) {
+            this.shardName = shardName;
+            this.actor = actor;
+            this.actorPath = actor.path();
+            this.peerAddresses = peerAddresses;
+        }
+
+        public String getShardName() {
+            return shardName;
+        }
+
+        public ActorRef getActor(){
+            return actor;
+        }
 
+        public ActorPath getActorPath() {
+            return actorPath;
+        }
+
+        public Map<String, String> getPeerAddresses() {
+            return peerAddresses;
+        }
+
+        public void updatePeerAddress(String peerId, String peerAddress){
+            LOG.info("updatePeerAddress for peer {} with address {}", peerId, peerAddress);
+            if(peerAddresses.containsKey(peerId)){
+                peerAddresses.put(peerId, peerAddress);
+
+                LOG.info("Sending PeerAddressResolved for peer {} with address {} to {}", peerId, peerAddress, actor.path());
+
+                actor
+                    .tell(new PeerAddressResolved(peerId, peerAddress),
+                        getSelf());
+
+            }
+        }
+    }
 }