Merge pull request #194 from metamx/batch-zk

Changed method of publishing segment ownership to ZK to use batching, includes changes to allow for migration

client/src/main/java/com/metamx/druid/QueryableNode.java

@@ -26,6 +26,7 @@ import com.google.common.base.Preconditions;
 import com.google.common.base.Throwables;
 import com.google.common.collect.Lists;
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
+import com.metamx.common.IAE;
 import com.metamx.common.ISE;
 import com.metamx.common.concurrent.ScheduledExecutorFactory;
 import com.metamx.common.concurrent.ScheduledExecutors;
@@ -33,14 +34,16 @@ import com.metamx.common.lifecycle.Lifecycle;
 import com.metamx.common.lifecycle.LifecycleStart;
 import com.metamx.common.lifecycle.LifecycleStop;
 import com.metamx.common.logger.Logger;
+import com.metamx.druid.client.BatchServerInventoryView;
 import com.metamx.druid.client.DruidServerConfig;
 import com.metamx.druid.client.InventoryView;
 import com.metamx.druid.client.ServerInventoryView;
 import com.metamx.druid.client.ServerInventoryViewConfig;
 import com.metamx.druid.client.ServerView;
+import com.metamx.druid.client.SingleServerInventoryView;
 import com.metamx.druid.concurrent.Execs;
 import com.metamx.druid.coordination.AbstractDataSegmentAnnouncer;
-import com.metamx.druid.coordination.BatchingDataSegmentAnnouncer;
+import com.metamx.druid.coordination.BatchDataSegmentAnnouncer;
 import com.metamx.druid.coordination.DataSegmentAnnouncer;
 import com.metamx.druid.coordination.DruidServerMetadata;
 import com.metamx.druid.coordination.MultipleDataSegmentAnnouncerDataSegmentAnnouncer;
@@ -357,13 +360,29 @@ public abstract class QueryableNode<T extends QueryableNode> extends Registering
       final ExecutorService exec = Executors.newFixedThreadPool(
           1, new ThreadFactoryBuilder().setDaemon(true).setNameFormat("ServerInventoryView-%s").build()
       );
-      serverInventoryView = new ServerInventoryView(
+
-          getConfigFactory().build(ServerInventoryViewConfig.class),
+      final ServerInventoryViewConfig serverInventoryViewConfig = getConfigFactory().build(ServerInventoryViewConfig.class);
+      final String announcerType = serverInventoryViewConfig.getAnnouncerType();
+
+      if ("legacy".equalsIgnoreCase(announcerType)) {
+        serverInventoryView = new SingleServerInventoryView(
+            serverInventoryViewConfig,
             getZkPaths(),
             getCuratorFramework(),
             exec,
             getJsonMapper()
         );
+      } else if ("batch".equalsIgnoreCase(announcerType)) {
+        serverInventoryView = new BatchServerInventoryView(
+            serverInventoryViewConfig,
+            getZkPaths(),
+            getCuratorFramework(),
+            exec,
+            getJsonMapper()
+        );
+      } else {
+        throw new IAE("Unknown type %s", announcerType);
+      }
       lifecycle.addManagedInstance(serverInventoryView);
     }
   }
@@ -374,17 +393,20 @@ public abstract class QueryableNode<T extends QueryableNode> extends Registering
       try {
         final String loggingType = props.getProperty("druid.request.logging.type");
         if ("emitter".equals(loggingType)) {
-          setRequestLogger(Initialization.makeEmittingRequestLogger(
+          setRequestLogger(
+              Initialization.makeEmittingRequestLogger(
                   getProps(),
                   getEmitter()
-          ));
+              )
-        }
+          );
-        else if ("file".equalsIgnoreCase(loggingType)) {
+        } else if ("file".equalsIgnoreCase(loggingType)) {
-          setRequestLogger(Initialization.makeFileRequestLogger(
+          setRequestLogger(
+              Initialization.makeFileRequestLogger(
                   getJsonMapper(),
                   getScheduledExecutorFactory(),
                   getProps()
-          ));
+              )
+          );
         } else {
           setRequestLogger(new NoopRequestLogger());
         }
@@ -428,19 +450,39 @@ public abstract class QueryableNode<T extends QueryableNode> extends Registering
       final Announcer announcer = new Announcer(getCuratorFramework(), Execs.singleThreaded("Announcer-%s"));
       lifecycle.addManagedInstance(announcer);
 
-      setAnnouncer(
+      final ZkDataSegmentAnnouncerConfig config = getConfigFactory().build(ZkDataSegmentAnnouncerConfig.class);
-          new MultipleDataSegmentAnnouncerDataSegmentAnnouncer(
+      final String announcerType = config.getAnnouncerType();
-              Arrays.<AbstractDataSegmentAnnouncer>asList(
+
-                  new BatchingDataSegmentAnnouncer(
+      final DataSegmentAnnouncer dataSegmentAnnouncer;
+      if ("batch".equalsIgnoreCase(announcerType)) {
+        dataSegmentAnnouncer = new BatchDataSegmentAnnouncer(
             getDruidServerMetadata(),
-                      getConfigFactory().build(ZkDataSegmentAnnouncerConfig.class),
+            config,
+            announcer,
+            getJsonMapper()
+        );
+      } else if ("legacy".equalsIgnoreCase(announcerType)) {
+        dataSegmentAnnouncer = new MultipleDataSegmentAnnouncerDataSegmentAnnouncer(
+            Arrays.<AbstractDataSegmentAnnouncer>asList(
+                new BatchDataSegmentAnnouncer(
+                    getDruidServerMetadata(),
+                    config,
                     announcer,
                     getJsonMapper()
                 ),
-                  new SingleDataSegmentAnnouncer(getDruidServerMetadata(), getZkPaths(), announcer, getJsonMapper())
+                new SingleDataSegmentAnnouncer(
+                    getDruidServerMetadata(),
+                    getZkPaths(),
+                    announcer,
+                    getJsonMapper()
                 )
             )
         );
+      } else {
+        throw new ISE("Unknown announcer type [%s]", announcerType);
+      }
+
+      setAnnouncer(dataSegmentAnnouncer);
 
       lifecycle.addManagedInstance(getAnnouncer(), Lifecycle.Stage.LAST);
     }

client/src/main/java/com/metamx/druid/client/BatchServerInventoryView.java

@@ -0,0 +1,129 @@
+/*
+ * Druid - a distributed column store.
+ * Copyright (C) 2012  Metamarkets Group Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package com.metamx.druid.client;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.collect.MapMaker;
+import com.google.common.collect.Sets;
+import com.metamx.common.ISE;
+import com.metamx.druid.curator.inventory.InventoryManagerConfig;
+import com.metamx.druid.initialization.ZkPathsConfig;
+import com.metamx.emitter.EmittingLogger;
+import org.apache.curator.framework.CuratorFramework;
+
+import java.util.Set;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.ExecutorService;
+
+/**
+ */
+public class BatchServerInventoryView extends ServerInventoryView<Set<DataSegment>>
+{
+  private static final EmittingLogger log = new EmittingLogger(BatchServerInventoryView.class);
+
+  final ConcurrentMap<String, Set<DataSegment>> zNodes = new MapMaker().makeMap();
+
+  public BatchServerInventoryView(
+      final ServerInventoryViewConfig config,
+      final ZkPathsConfig zkPaths,
+      final CuratorFramework curator,
+      final ExecutorService exec,
+      final ObjectMapper jsonMapper
+  )
+  {
+    super(
+        config,
+        log,
+        new InventoryManagerConfig()
+        {
+          @Override
+          public String getContainerPath()
+          {
+            return zkPaths.getAnnouncementsPath();
+          }
+
+          @Override
+          public String getInventoryPath()
+          {
+            return zkPaths.getLiveSegmentsPath();
+          }
+        },
+        curator,
+        exec,
+        jsonMapper,
+        new TypeReference<Set<DataSegment>>()
+        {
+        }
+    );
+  }
+
+  @Override
+  protected DruidServer addInnerInventory(
+      final DruidServer container,
+      String inventoryKey,
+      final Set<DataSegment> inventory
+  )
+  {
+    zNodes.put(inventoryKey, inventory);
+    for (DataSegment segment : inventory) {
+      addSingleInventory(container, segment);
+    }
+    return container;
+  }
+
+  @Override
+  protected DruidServer updateInnerInventory(
+      DruidServer container, String inventoryKey, Set<DataSegment> inventory
+  )
+  {
+    Set<DataSegment> existing = zNodes.get(inventoryKey);
+    if (existing == null) {
+      throw new ISE("Trying to update an inventoryKey[%s] that didn't exist?!", inventoryKey);
+    }
+
+    for (DataSegment segment : Sets.difference(inventory, existing)) {
+      addSingleInventory(container, segment);
+    }
+    for (DataSegment segment : Sets.difference(existing, inventory)) {
+      removeSingleInventory(container, segment.getIdentifier());
+    }
+    zNodes.put(inventoryKey, inventory);
+
+    return container;
+  }
+
+  @Override
+  protected DruidServer removeInnerInventory(final DruidServer container, String inventoryKey)
+  {
+    log.info("Server[%s] removed container[%s]", container.getName(), inventoryKey);
+    Set<DataSegment> segments = zNodes.remove(inventoryKey);
+
+    if (segments == null) {
+      log.warn("Told to remove container[%s], which didn't exist", inventoryKey);
+      return container;
+    }
+
+    for (DataSegment segment : segments) {
+      removeSingleInventory(container, segment.getIdentifier());
+    }
+    return container;
+  }
+}

client/src/main/java/com/metamx/druid/client/ServerInventoryView.java

@@ -20,16 +20,17 @@
 package com.metamx.druid.client;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Function;
 import com.google.common.base.Throwables;
 import com.google.common.collect.MapMaker;
 import com.metamx.common.lifecycle.LifecycleStart;
 import com.metamx.common.lifecycle.LifecycleStop;
+import com.metamx.common.logger.Logger;
 import com.metamx.druid.curator.inventory.CuratorInventoryManager;
 import com.metamx.druid.curator.inventory.CuratorInventoryManagerStrategy;
 import com.metamx.druid.curator.inventory.InventoryManagerConfig;
-import com.metamx.druid.initialization.ZkPathsConfig;
 import com.metamx.emitter.EmittingLogger;
 import org.apache.curator.framework.CuratorFramework;
 
@@ -43,44 +44,35 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 /**
  */
-public class ServerInventoryView implements ServerView, InventoryView
+public abstract class ServerInventoryView<InventoryType> implements ServerView, InventoryView
 {
-  private static final EmittingLogger log = new EmittingLogger(ServerInventoryView.class);
+  private final ServerInventoryViewConfig config;
-
+  private final Logger log;
-  private final CuratorInventoryManager<DruidServer, DataSegment> inventoryManager;
+  private final CuratorInventoryManager<DruidServer, InventoryType> inventoryManager;
   private final AtomicBoolean started = new AtomicBoolean(false);
 
   private final ConcurrentMap<ServerCallback, Executor> serverCallbacks = new MapMaker().makeMap();
   private final ConcurrentMap<SegmentCallback, Executor> segmentCallbacks = new MapMaker().makeMap();
 
-  private static final Map<String, Integer> removedSegments = new MapMaker().makeMap();
+  private final Map<String, Integer> removedSegments = new MapMaker().makeMap();
 
   public ServerInventoryView(
       final ServerInventoryViewConfig config,
-      final ZkPathsConfig zkPaths,
+      final Logger log,
+      final InventoryManagerConfig inventoryManagerConfig,
       final CuratorFramework curator,
       final ExecutorService exec,
-      final ObjectMapper jsonMapper
+      final ObjectMapper jsonMapper,
+      final TypeReference<InventoryType> typeReference
   )
   {
-    inventoryManager = new CuratorInventoryManager<DruidServer, DataSegment>(
+    this.config = config;
+    this.log = log;
+    this.inventoryManager = new CuratorInventoryManager<DruidServer, InventoryType>(
         curator,
-        new InventoryManagerConfig()
+        inventoryManagerConfig,
-        {
-          @Override
-          public String getContainerPath()
-          {
-            return zkPaths.getAnnouncementsPath();
-          }
-
-          @Override
-          public String getInventoryPath()
-          {
-            return zkPaths.getServedSegmentsPath();
-          }
-        },
         exec,
-        new CuratorInventoryManagerStrategy<DruidServer, DataSegment>()
+        new CuratorInventoryManagerStrategy<DruidServer, InventoryType>()
         {
           @Override
           public DruidServer deserializeContainer(byte[] bytes)
@@ -105,10 +97,10 @@ public class ServerInventoryView implements ServerView, InventoryView
           }
 
           @Override
-          public DataSegment deserializeInventory(byte[] bytes)
+          public InventoryType deserializeInventory(byte[] bytes)
           {
             try {
-              return jsonMapper.readValue(bytes, DataSegment.class);
+              return jsonMapper.readValue(bytes, typeReference);
             }
             catch (IOException e) {
               throw Throwables.propagate(e);
@@ -116,7 +108,7 @@ public class ServerInventoryView implements ServerView, InventoryView
           }
 
           @Override
-          public byte[] serializeInventory(DataSegment inventory)
+          public byte[] serializeInventory(InventoryType inventory)
           {
             try {
               return jsonMapper.writeValueAsBytes(inventory);
@@ -146,67 +138,27 @@ public class ServerInventoryView implements ServerView, InventoryView
           }
 
           @Override
-          public DruidServer addInventory(final DruidServer container, String inventoryKey, final DataSegment inventory)
+          public DruidServer addInventory(
+              final DruidServer container,
+              String inventoryKey,
+              final InventoryType inventory
+          )
           {
-            log.info("Server[%s] added segment[%s]", container.getName(), inventoryKey);
+            return addInnerInventory(container, inventoryKey, inventory);
-
-            if (container.getSegment(inventoryKey) != null) {
-              log.warn(
-                  "Not adding or running callbacks for existing segment[%s] on server[%s]",
-                  inventoryKey,
-                  container.getName()
-              );
-
-              return container;
           }
 
-            final DruidServer retVal = container.addDataSegment(inventoryKey, inventory);
-
-            runSegmentCallbacks(
-                new Function<SegmentCallback, CallbackAction>()
-                {
           @Override
-                  public CallbackAction apply(SegmentCallback input)
+          public DruidServer updateInventory(
+              DruidServer container, String inventoryKey, InventoryType inventory
+          )
           {
-                    return input.segmentAdded(container, inventory);
+            return updateInnerInventory(container, inventoryKey, inventory);
-                  }
-                }
-            );
-
-            return retVal;
           }
 
           @Override
           public DruidServer removeInventory(final DruidServer container, String inventoryKey)
           {
-            log.info("Server[%s] removed segment[%s]", container.getName(), inventoryKey);
+            return removeInnerInventory(container, inventoryKey);
-            final DataSegment segment = container.getSegment(inventoryKey);
-
-            if (segment == null) {
-              log.warn(
-                  "Not running cleanup or callbacks for non-existing segment[%s] on server[%s]",
-                  inventoryKey,
-                  container.getName()
-              );
-
-              return container;
-            }
-
-            final DruidServer retVal = container.removeDataSegment(inventoryKey);
-
-            runSegmentCallbacks(
-                new Function<SegmentCallback, CallbackAction>()
-                {
-                  @Override
-                  public CallbackAction apply(SegmentCallback input)
-                  {
-                    return input.segmentRemoved(container, segment);
-                  }
-                }
-            );
-
-            removedSegments.put(inventoryKey, config.getRemovedSegmentLifetime());
-            return retVal;
           }
         }
     );
@@ -282,7 +234,12 @@ public class ServerInventoryView implements ServerView, InventoryView
     segmentCallbacks.put(callback, exec);
   }
 
-  private void runSegmentCallbacks(
+  public InventoryManagerConfig getInventoryManagerConfig()
+  {
+    return inventoryManager.getConfig();
+  }
+
+  protected void runSegmentCallbacks(
       final Function<SegmentCallback, CallbackAction> fn
   )
   {
@@ -302,7 +259,7 @@ public class ServerInventoryView implements ServerView, InventoryView
     }
   }
 
-  private void runServerCallbacks(final DruidServer server)
+  protected void runServerCallbacks(final DruidServer server)
   {
     for (final Map.Entry<ServerCallback, Executor> entry : serverCallbacks.entrySet()) {
       entry.getValue().execute(
@@ -319,4 +276,83 @@ public class ServerInventoryView implements ServerView, InventoryView
       );
     }
   }
+
+  protected void addSingleInventory(
+      final DruidServer container,
+      final DataSegment inventory
+  )
+  {
+    log.info("Server[%s] added segment[%s]", container.getName(), inventory.getIdentifier());
+
+    if (container.getSegment(inventory.getIdentifier()) != null) {
+      log.warn(
+          "Not adding or running callbacks for existing segment[%s] on server[%s]",
+          inventory.getIdentifier(),
+          container.getName()
+      );
+
+      return;
+    }
+
+    container.addDataSegment(inventory.getIdentifier(), inventory);
+
+    runSegmentCallbacks(
+        new Function<SegmentCallback, CallbackAction>()
+        {
+          @Override
+          public CallbackAction apply(SegmentCallback input)
+          {
+            return input.segmentAdded(container, inventory);
+          }
+        }
+    );
+  }
+
+  protected void removeSingleInventory(final DruidServer container, String inventoryKey)
+  {
+    log.info("Server[%s] removed segment[%s]", container.getName(), inventoryKey);
+    final DataSegment segment = container.getSegment(inventoryKey);
+
+    if (segment == null) {
+      log.warn(
+          "Not running cleanup or callbacks for non-existing segment[%s] on server[%s]",
+          inventoryKey,
+          container.getName()
+      );
+
+      return;
+    }
+
+    container.removeDataSegment(inventoryKey);
+
+    runSegmentCallbacks(
+        new Function<SegmentCallback, CallbackAction>()
+        {
+          @Override
+          public CallbackAction apply(SegmentCallback input)
+          {
+            return input.segmentRemoved(container, segment);
+          }
+        }
+    );
+
+    removedSegments.put(inventoryKey, config.getRemovedSegmentLifetime());
+  }
+
+  protected abstract DruidServer addInnerInventory(
+      final DruidServer container,
+      String inventoryKey,
+      final InventoryType inventory
+  );
+
+  protected abstract DruidServer updateInnerInventory(
+      final DruidServer container,
+      String inventoryKey,
+      final InventoryType inventory
+  );
+
+  protected abstract DruidServer removeInnerInventory(
+      final DruidServer container,
+      String inventoryKey
+  );
 }

client/src/main/java/com/metamx/druid/client/ServerInventoryViewConfig.java

@@ -29,4 +29,8 @@ public abstract class ServerInventoryViewConfig
   @Config("druid.master.removedSegmentLifetime")
   @Default("1")
   public abstract int getRemovedSegmentLifetime();
+
+  @Config("druid.announcer.type")
+  @Default("legacy")
+  public abstract String getAnnouncerType();
 }

client/src/main/java/com/metamx/druid/client/SingleServerInventoryView.java

@@ -0,0 +1,94 @@
+/*
+ * Druid - a distributed column store.
+ * Copyright (C) 2012  Metamarkets Group Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package com.metamx.druid.client;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.metamx.druid.curator.inventory.InventoryManagerConfig;
+import com.metamx.druid.initialization.ZkPathsConfig;
+import com.metamx.emitter.EmittingLogger;
+import org.apache.curator.framework.CuratorFramework;
+
+import java.util.concurrent.ExecutorService;
+
+/**
+ */
+public class SingleServerInventoryView extends ServerInventoryView<DataSegment>
+{
+  private static final EmittingLogger log = new EmittingLogger(SingleServerInventoryView.class);
+
+  public SingleServerInventoryView(
+      final ServerInventoryViewConfig config,
+      final ZkPathsConfig zkPaths,
+      final CuratorFramework curator,
+      final ExecutorService exec,
+      final ObjectMapper jsonMapper
+  )
+  {
+    super(
+        config,
+        log,
+        new InventoryManagerConfig()
+        {
+          @Override
+          public String getContainerPath()
+          {
+            return zkPaths.getAnnouncementsPath();
+          }
+
+          @Override
+          public String getInventoryPath()
+          {
+            return zkPaths.getServedSegmentsPath();
+          }
+        },
+        curator,
+        exec,
+        jsonMapper,
+        new TypeReference<DataSegment>()
+        {
+        }
+    );
+  }
+
+  @Override
+  protected DruidServer addInnerInventory(
+      DruidServer container, String inventoryKey, DataSegment inventory
+  )
+  {
+    addSingleInventory(container, inventory);
+    return container;
+  }
+
+  @Override
+  protected DruidServer updateInnerInventory(
+      DruidServer container, String inventoryKey, DataSegment inventory
+  )
+  {
+    return addInnerInventory(container, inventoryKey, inventory);
+  }
+
+  @Override
+  protected DruidServer removeInnerInventory(DruidServer container, String inventoryKey)
+  {
+    removeSingleInventory(container, inventoryKey);
+    return container;
+  }
+}

client/src/main/java/com/metamx/druid/coordination/BatchDataSegmentAnnouncer.java

@@ -39,9 +39,9 @@ import java.util.Set;
 
 /**
  */
-public class BatchingDataSegmentAnnouncer extends AbstractDataSegmentAnnouncer
+public class BatchDataSegmentAnnouncer extends AbstractDataSegmentAnnouncer
 {
-  private static final Logger log = new Logger(BatchingDataSegmentAnnouncer.class);
+  private static final Logger log = new Logger(BatchDataSegmentAnnouncer.class);
 
   private final ZkDataSegmentAnnouncerConfig config;
   private final Announcer announcer;
@@ -51,7 +51,7 @@ public class BatchingDataSegmentAnnouncer extends AbstractDataSegmentAnnouncer
   private final Set<SegmentZNode> availableZNodes = Sets.newHashSet();
   private final Map<DataSegment, SegmentZNode> segmentLookup = Maps.newHashMap();
 
-  public BatchingDataSegmentAnnouncer(
+  public BatchDataSegmentAnnouncer(
       DruidServerMetadata server,
       ZkDataSegmentAnnouncerConfig config,
       Announcer announcer,

client/src/main/java/com/metamx/druid/curator/inventory/CuratorInventoryManager.java

@@ -135,6 +135,11 @@ public class CuratorInventoryManager<ContainerClass, InventoryClass>
     }
   }
 
+  public InventoryManagerConfig getConfig()
+  {
+    return config;
+  }
+
   public ContainerClass getInventoryValue(String containerKey)
   {
     final ContainerHolder containerHolder = containers.get(containerKey);
@@ -290,11 +295,18 @@ public class CuratorInventoryManager<ContainerClass, InventoryClass>
 
         switch (event.getType()) {
           case CHILD_ADDED:
-          case CHILD_UPDATED:
+            final InventoryClass addedInventory = strategy.deserializeInventory(child.getData());
-            final InventoryClass inventory = strategy.deserializeInventory(child.getData());
 
             synchronized (holder) {
-              holder.setContainer(strategy.addInventory(holder.getContainer(), inventoryKey, inventory));
+              holder.setContainer(strategy.addInventory(holder.getContainer(), inventoryKey, addedInventory));
+            }
+
+            break;
+          case CHILD_UPDATED:
+            final InventoryClass updatedInventory = strategy.deserializeInventory(child.getData());
+
+            synchronized (holder) {
+              holder.setContainer(strategy.updateInventory(holder.getContainer(), inventoryKey, updatedInventory));
             }
 
             break;

client/src/main/java/com/metamx/druid/curator/inventory/CuratorInventoryManagerStrategy.java

@@ -33,5 +33,6 @@ public interface CuratorInventoryManagerStrategy<ContainerClass, InventoryClass>
   public void deadContainer(ContainerClass deadContainer);
   public ContainerClass updateContainer(ContainerClass oldContainer, ContainerClass newContainer);
   public ContainerClass addInventory(ContainerClass container, String inventoryKey, InventoryClass inventory);
+  public ContainerClass updateInventory(ContainerClass container, String inventoryKey, InventoryClass inventory);
   public ContainerClass removeInventory(ContainerClass container, String inventoryKey);
 }

client/src/main/java/com/metamx/druid/initialization/CuratorConfig.java

@@ -32,4 +32,8 @@ public abstract class CuratorConfig
   @Config("druid.zk.service.sessionTimeoutMs")
   @Default("30000")
   public abstract int getZkSessionTimeoutMs();
+
+  @Config("druid.curator.compression.enable")
+  @Default("false")
+  public abstract boolean enableCompression();
 }

client/src/main/java/com/metamx/druid/initialization/Initialization.java

@@ -72,13 +72,13 @@ public class Initialization
   /**
    * Load properties.
    * Properties are layered:
-   *
+   * <p/>
    * # stored in zookeeper
    * # runtime.properties file,
    * # cmdLine -D
-   *
+   * <p/>
    * command line overrides runtime.properties which overrides zookeeper
-   *
+   * <p/>
    * Idempotent. Thread-safe.  Properties are only loaded once.
    * If property druid.zk.service.host is not set then do not load properties from zookeeper.
    *
@@ -197,8 +197,7 @@ public class Initialization
                                .connectString(curatorConfig.getZkHosts())
                                .sessionTimeoutMs(curatorConfig.getZkSessionTimeoutMs())
             .retryPolicy(new BoundedExponentialBackoffRetry(1000, 45000, 30))
-                               // Don't compress stuff written just yet, need to get code deployed first.
+            .compressionProvider(new PotentiallyGzippedCompressionProvider(curatorConfig.enableCompression()))
-                               .compressionProvider(new PotentiallyGzippedCompressionProvider(false))
             .build();
 
     lifecycle.addHandler(

client/src/main/java/com/metamx/druid/initialization/ZkDataSegmentAnnouncerConfig.java

@@ -14,4 +14,8 @@ public abstract class ZkDataSegmentAnnouncerConfig extends ZkPathsConfig
   @Config("druid.zk.maxNumBytesPerNode")
   @Default("512000")
   public abstract long getMaxNumBytes();
+
+  @Config("druid.announcer.type")
+  @Default("legacy")
+  public abstract String getAnnouncerType();
 }

client/src/test/java/com/metamx/druid/client/BatchServerInventoryViewTest.java

@@ -0,0 +1,231 @@
+/*
+ * Druid - a distributed column store.
+ * Copyright (C) 2012  Metamarkets Group Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package com.metamx.druid.client;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.base.Joiner;
+import com.google.common.base.Stopwatch;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Sets;
+import com.google.common.util.concurrent.MoreExecutors;
+import com.metamx.common.ISE;
+import com.metamx.druid.coordination.BatchDataSegmentAnnouncer;
+import com.metamx.druid.coordination.DruidServerMetadata;
+import com.metamx.druid.curator.PotentiallyGzippedCompressionProvider;
+import com.metamx.druid.curator.announcement.Announcer;
+import com.metamx.druid.initialization.ZkDataSegmentAnnouncerConfig;
+import com.metamx.druid.initialization.ZkPathsConfig;
+import com.metamx.druid.jackson.DefaultObjectMapper;
+import junit.framework.Assert;
+import org.apache.curator.framework.CuratorFramework;
+import org.apache.curator.framework.CuratorFrameworkFactory;
+import org.apache.curator.retry.ExponentialBackoffRetry;
+import org.apache.curator.test.TestingCluster;
+import org.joda.time.DateTime;
+import org.joda.time.Interval;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Set;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+/**
+ */
+public class BatchServerInventoryViewTest
+{
+  private static final String testBasePath = "/test";
+  private static final Joiner joiner = Joiner.on("/");
+
+  private TestingCluster testingCluster;
+  private CuratorFramework cf;
+  private ObjectMapper jsonMapper;
+  private Announcer announcer;
+  private BatchDataSegmentAnnouncer segmentAnnouncer;
+  private Set<DataSegment> testSegments;
+  private BatchServerInventoryView batchServerInventoryView;
+
+  @Before
+  public void setUp() throws Exception
+  {
+    testingCluster = new TestingCluster(1);
+    testingCluster.start();
+
+    cf = CuratorFrameworkFactory.builder()
+                                .connectString(testingCluster.getConnectString())
+                                .retryPolicy(new ExponentialBackoffRetry(1, 10))
+                                .compressionProvider(new PotentiallyGzippedCompressionProvider(true))
+                                .build();
+    cf.start();
+    cf.create().creatingParentsIfNeeded().forPath(testBasePath);
+
+    jsonMapper = new DefaultObjectMapper();
+
+    announcer = new Announcer(
+        cf,
+        MoreExecutors.sameThreadExecutor()
+    );
+    announcer.start();
+
+    segmentAnnouncer = new BatchDataSegmentAnnouncer(
+        new DruidServerMetadata(
+            "id",
+            "host",
+            Long.MAX_VALUE,
+            "type",
+            "tier"
+        ),
+        new ZkDataSegmentAnnouncerConfig()
+        {
+          @Override
+          public String getZkBasePath()
+          {
+            return testBasePath;
+          }
+
+          @Override
+          public int getSegmentsPerNode()
+          {
+            return 50;
+          }
+
+          @Override
+          public long getMaxNumBytes()
+          {
+            return 100000;
+          }
+
+          @Override
+          public String getAnnouncerType()
+          {
+            return "batch";
+          }
+        },
+        announcer,
+        jsonMapper
+    );
+    segmentAnnouncer.start();
+
+    testSegments = Sets.newHashSet();
+    for (int i = 0; i < 100; i++) {
+      testSegments.add(makeSegment(i));
+    }
+
+    batchServerInventoryView = new BatchServerInventoryView(
+        new ServerInventoryViewConfig()
+        {
+          @Override
+          public int getRemovedSegmentLifetime()
+          {
+            return 0;
+          }
+
+          @Override
+          public String getAnnouncerType()
+          {
+            return "batch";
+          }
+        },
+        new ZkPathsConfig()
+        {
+          @Override
+          public String getZkBasePath()
+          {
+            return testBasePath;
+          }
+        },
+        cf,
+        Executors.newSingleThreadExecutor(),
+        jsonMapper
+    );
+
+    batchServerInventoryView.start();
+  }
+
+  @After
+  public void tearDown() throws Exception
+  {
+    batchServerInventoryView.stop();
+    segmentAnnouncer.stop();
+    announcer.stop();
+    cf.close();
+    testingCluster.stop();
+  }
+
+  @Test
+  public void testRun() throws Exception
+  {
+    segmentAnnouncer.announceSegments(testSegments);
+
+    waitForSync();
+
+    DruidServer server = Iterables.get(batchServerInventoryView.getInventory(), 0);
+    Set<DataSegment> segments = Sets.newHashSet(server.getSegments().values());
+
+    Assert.assertEquals(testSegments, segments);
+
+    DataSegment segment1 = makeSegment(101);
+    DataSegment segment2 = makeSegment(102);
+
+    segmentAnnouncer.announceSegment(segment1);
+    segmentAnnouncer.announceSegment(segment2);
+    testSegments.add(segment1);
+    testSegments.add(segment2);
+
+    waitForSync();
+
+    Assert.assertEquals(testSegments, Sets.newHashSet(server.getSegments().values()));
+
+    segmentAnnouncer.unannounceSegment(segment1);
+    segmentAnnouncer.unannounceSegment(segment2);
+    testSegments.remove(segment1);
+    testSegments.remove(segment2);
+
+    waitForSync();
+
+    Assert.assertEquals(testSegments, Sets.newHashSet(server.getSegments().values()));
+  }
+
+  private DataSegment makeSegment(int offset)
+  {
+    return DataSegment.builder()
+                      .dataSource("foo")
+                      .interval(
+                          new Interval(
+                              new DateTime("2013-01-01").plusDays(offset),
+                              new DateTime("2013-01-02").plusDays(offset)
+                          )
+                      )
+                      .version(new DateTime().toString())
+                      .build();
+  }
+
+  private void waitForSync() throws Exception
+  {
+    Stopwatch stopwatch = new Stopwatch().start();
+    while (Iterables.get(batchServerInventoryView.getInventory(), 0).getSegments().size() != testSegments.size()) {
+      Thread.sleep(500);
+      if (stopwatch.elapsed(TimeUnit.MILLISECONDS) > 5000) {
+        throw new ISE("BatchServerInventoryView is not updating");
+      }
+    }
+  }
+}

client/src/test/java/com/metamx/druid/coordination/BatchDataSegmentAnnouncerTest.java

@@ -47,7 +47,7 @@ import java.util.Set;
 
 /**
  */
-public class BatchingDataSegmentAnnouncerTest
+public class BatchDataSegmentAnnouncerTest
 {
   private static final String testBasePath = "/test";
   private static final String testSegmentsPath = "/test/segments/id";
@@ -58,7 +58,7 @@ public class BatchingDataSegmentAnnouncerTest
   private ObjectMapper jsonMapper;
   private Announcer announcer;
   private SegmentReader segmentReader;
-  private BatchingDataSegmentAnnouncer segmentAnnouncer;
+  private BatchDataSegmentAnnouncer segmentAnnouncer;
   private Set<DataSegment> testSegments;
 
   @Before
@@ -84,7 +84,7 @@ public class BatchingDataSegmentAnnouncerTest
     announcer.start();
 
     segmentReader = new SegmentReader(cf, jsonMapper);
-    segmentAnnouncer = new BatchingDataSegmentAnnouncer(
+    segmentAnnouncer = new BatchDataSegmentAnnouncer(
         new DruidServerMetadata(
             "id",
             "host",
@@ -111,6 +111,12 @@ public class BatchingDataSegmentAnnouncerTest
           {
             return 100000;
           }
+
+          @Override
+          public String getAnnouncerType()
+          {
+            return "batch";
+          }
         },
         announcer,
         jsonMapper

client/src/test/java/com/metamx/druid/curator/inventory/CuratorInventoryManagerTest.java

@@ -209,6 +209,14 @@ public class CuratorInventoryManagerTest extends CuratorTestBase
       return container;
     }
 
+    @Override
+    public Map<String, Integer> updateInventory(
+        Map<String, Integer> container, String inventoryKey, Integer inventory
+    )
+    {
+      return addInventory(container, inventoryKey, inventory);
+    }
+
     @Override
     public Map<String, Integer> removeInventory(Map<String, Integer> container, String inventoryKey)
     {

indexing-common/src/main/java/com/metamx/druid/index/v1/SpatialDimensionRowFormatter.java

@@ -143,10 +143,7 @@ public class SpatialDimensionRowFormatter
       @Override
       public String toString()
       {
-        return "InputRow{" +
+        return row.toString();
-               "timestamp=" + row.getTimestampFromEpoch() +
-               ", dimensions=" + row.getDimensions() +
-               '}';
       }
     };
 

server/src/main/java/com/metamx/druid/coordination/ZkCoordinator.java

@@ -50,14 +50,12 @@ public class ZkCoordinator implements DataSegmentChangeHandler
 
   private final ObjectMapper jsonMapper;
   private final ZkCoordinatorConfig config;
+  private final ZkPathsConfig zkPaths;
   private final DruidServerMetadata me;
   private final DataSegmentAnnouncer announcer;
   private final CuratorFramework curator;
   private final ServerManager serverManager;
 
-  private final String loadQueueLocation;
-  private final String servedSegmentsLocation;
-
   private volatile PathChildrenCache loadQueueCache;
   private volatile boolean started;
 
@@ -73,13 +71,11 @@ public class ZkCoordinator implements DataSegmentChangeHandler
   {
     this.jsonMapper = jsonMapper;
     this.config = config;
+    this.zkPaths = zkPaths;
     this.me = me;
     this.announcer = announcer;
     this.curator = curator;
     this.serverManager = serverManager;
-
-    this.loadQueueLocation = ZKPaths.makePath(zkPaths.getLoadQueuePath(), me.getName());
-    this.servedSegmentsLocation = ZKPaths.makePath(zkPaths.getServedSegmentsPath(), me.getName());
   }
 
   @LifecycleStart
@@ -91,6 +87,10 @@ public class ZkCoordinator implements DataSegmentChangeHandler
         return;
       }
 
+      final String loadQueueLocation = ZKPaths.makePath(zkPaths.getLoadQueuePath(), me.getName());
+      final String servedSegmentsLocation = ZKPaths.makePath(zkPaths.getServedSegmentsPath(), me.getName());
+      final String liveSegmentsLocation = ZKPaths.makePath(zkPaths.getLiveSegmentsPath(), me.getName());
+
       loadQueueCache = new PathChildrenCache(
           curator,
           loadQueueLocation,
@@ -104,6 +104,7 @@ public class ZkCoordinator implements DataSegmentChangeHandler
 
         curator.newNamespaceAwareEnsurePath(loadQueueLocation).ensure(curator.getZookeeperClient());
         curator.newNamespaceAwareEnsurePath(servedSegmentsLocation).ensure(curator.getZookeeperClient());
+        curator.newNamespaceAwareEnsurePath(liveSegmentsLocation).ensure(curator.getZookeeperClient());
 
         if (config.isLoadFromSegmentCacheEnabled()) {
           loadCache();

server/src/main/java/com/metamx/druid/http/MasterMain.java

@@ -27,13 +27,16 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import com.google.inject.Guice;
 import com.google.inject.Injector;
 import com.google.inject.servlet.GuiceFilter;
+import com.metamx.common.IAE;
 import com.metamx.common.concurrent.ScheduledExecutorFactory;
 import com.metamx.common.concurrent.ScheduledExecutors;
 import com.metamx.common.config.Config;
 import com.metamx.common.lifecycle.Lifecycle;
 import com.metamx.common.logger.Logger;
+import com.metamx.druid.client.BatchServerInventoryView;
 import com.metamx.druid.client.ServerInventoryView;
 import com.metamx.druid.client.ServerInventoryViewConfig;
+import com.metamx.druid.client.SingleServerInventoryView;
 import com.metamx.druid.client.indexing.IndexingServiceClient;
 import com.metamx.druid.concurrent.Execs;
 import com.metamx.druid.config.ConfigManager;
@@ -131,9 +134,31 @@ public class MasterMain
     final ExecutorService exec = Executors.newFixedThreadPool(
         1, new ThreadFactoryBuilder().setDaemon(true).setNameFormat("ServerInventoryView-%s").build()
     );
-    ServerInventoryView serverInventoryView = new ServerInventoryView(
+
-        configFactory.build(ServerInventoryViewConfig.class), zkPaths, curatorFramework, exec, jsonMapper
+    final ServerInventoryViewConfig serverInventoryViewConfig = configFactory.build(ServerInventoryViewConfig.class);
+    final String announcerType = serverInventoryViewConfig.getAnnouncerType();
+
+    final ServerInventoryView serverInventoryView;
+    if ("legacy".equalsIgnoreCase(announcerType)) {
+      serverInventoryView = new SingleServerInventoryView(
+          serverInventoryViewConfig,
+          zkPaths,
+          curatorFramework,
+          exec,
+          jsonMapper
       );
+    } else if ("batch".equalsIgnoreCase(announcerType)) {
+      serverInventoryView = new BatchServerInventoryView(
+          serverInventoryViewConfig,
+          zkPaths,
+          curatorFramework,
+          exec,
+          jsonMapper
+      );
+    } else {
+      throw new IAE("Unknown type %s", announcerType);
+    }
+
     lifecycle.addManagedInstance(serverInventoryView);
 
     final DbConnectorConfig dbConnectorConfig = configFactory.build(DbConnectorConfig.class);

server/src/main/java/com/metamx/druid/master/DruidMaster.java

@@ -85,7 +85,7 @@ public class DruidMaster
   private final ZkPathsConfig zkPaths;
   private final JacksonConfigManager configManager;
   private final DatabaseSegmentManager databaseSegmentManager;
-  private final ServerInventoryView serverInventoryView;
+  private final ServerInventoryView<Object> serverInventoryView;
   private final DatabaseRuleManager databaseRuleManager;
   private final CuratorFramework curator;
   private final ServiceEmitter emitter;
@@ -291,7 +291,7 @@ public class DruidMaster
 
       final String toLoadQueueSegPath = ZKPaths.makePath(ZKPaths.makePath(zkPaths.getLoadQueuePath(), to), segmentName);
       final String toServedSegPath = ZKPaths.makePath(
-          ZKPaths.makePath(zkPaths.getServedSegmentsPath(), to), segmentName
+          ZKPaths.makePath(serverInventoryView.getInventoryManagerConfig().getInventoryPath(), to), segmentName
       );
 
       loadPeon.loadSegment(

server/src/main/java/com/metamx/druid/utils/DruidSetup.java

@@ -296,6 +296,7 @@ public class DruidSetup
     createPath(curator, zkPaths.getMasterPath(), out);
     createPath(curator, zkPaths.getLoadQueuePath(), out);
     createPath(curator, zkPaths.getServedSegmentsPath(), out);
+    createPath(curator, zkPaths.getLiveSegmentsPath(), out);
     createPath(curator, zkPaths.getPropertiesPath(), out);
   }
 

server/src/test/java/com/metamx/druid/master/DruidMasterTest.java

@@ -23,7 +23,8 @@ import com.google.common.collect.MapMaker;
 import com.metamx.common.concurrent.ScheduledExecutorFactory;
 import com.metamx.druid.client.DataSegment;
 import com.metamx.druid.client.DruidServer;
-import com.metamx.druid.client.ServerInventoryView;
+import com.metamx.druid.client.SingleServerInventoryView;
+import com.metamx.druid.curator.inventory.InventoryManagerConfig;
 import com.metamx.druid.db.DatabaseSegmentManager;
 import com.metamx.druid.initialization.ZkPathsConfig;
 import com.metamx.druid.metrics.NoopServiceEmitter;
@@ -44,7 +45,7 @@ public class DruidMasterTest
   private CuratorFramework curator;
   private LoadQueueTaskMaster taskMaster;
   private DatabaseSegmentManager databaseSegmentManager;
-  private ServerInventoryView serverInventoryView;
+  private SingleServerInventoryView serverInventoryView;
   private ScheduledExecutorFactory scheduledExecutorFactory;
   private DruidServer druidServer;
   private DataSegment segment;
@@ -58,7 +59,7 @@ public class DruidMasterTest
     segment = EasyMock.createNiceMock(DataSegment.class);
     loadQueuePeon = EasyMock.createNiceMock(LoadQueuePeon.class);
     loadManagementPeons = new MapMaker().makeMap();
-    serverInventoryView = EasyMock.createMock(ServerInventoryView.class);
+    serverInventoryView = EasyMock.createMock(SingleServerInventoryView.class);
 
     databaseSegmentManager = EasyMock.createNiceMock(DatabaseSegmentManager.class);
     EasyMock.replay(databaseSegmentManager);
@@ -169,6 +170,20 @@ public class DruidMasterTest
 
     EasyMock.expect(serverInventoryView.getInventoryValue("from")).andReturn(druidServer);
     EasyMock.expect(serverInventoryView.getInventoryValue("to")).andReturn(druidServer);
+    EasyMock.expect(serverInventoryView.getInventoryManagerConfig()).andReturn(new InventoryManagerConfig()
+    {
+      @Override
+      public String getContainerPath()
+      {
+        return "";
+      }
+
+      @Override
+      public String getInventoryPath()
+      {
+        return "";
+      }
+    });
     EasyMock.replay(serverInventoryView);
 
     master.moveSegment("from", "to", "dummySegment", null);