diff --git a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/CNNFeedAdapterFactory.java b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/CNNFeedAdapterFactory.java
index 6880308..bf89ccb 100644
--- a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/CNNFeedAdapterFactory.java
+++ b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/CNNFeedAdapterFactory.java
@@ -80,7 +80,7 @@
     }
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
         CNNFeedAdapter cnnFeedAdapter = new CNNFeedAdapter(configuration, recordType, ctx);
         return cnnFeedAdapter;
     }
diff --git a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/HDFSAdapterFactory.java b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/HDFSAdapterFactory.java
index af057c9..f81c0d5 100644
--- a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/HDFSAdapterFactory.java
+++ b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/HDFSAdapterFactory.java
@@ -88,7 +88,7 @@
     }
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
         JobConf conf = confFactory.getConf();
         InputSplit[] inputSplits = inputSplitsFactory.getSplits();
         String nodeName = ctx.getJobletContext().getApplicationContext().getNodeId();
diff --git a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/HiveAdapterFactory.java b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/HiveAdapterFactory.java
index 991dadb..054fee3 100644
--- a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/HiveAdapterFactory.java
+++ b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/HiveAdapterFactory.java
@@ -82,7 +82,7 @@
     }
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
         JobConf conf = confFactory.getConf();
         InputSplit[] inputSplits = inputSplitsFactory.getSplits();
         String nodeName = ctx.getJobletContext().getApplicationContext().getNodeId();
diff --git a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/NCFileSystemAdapterFactory.java b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/NCFileSystemAdapterFactory.java
index 7c7b2a3..2e68588 100644
--- a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/NCFileSystemAdapterFactory.java
+++ b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/NCFileSystemAdapterFactory.java
@@ -49,7 +49,7 @@
     private FileSplit[] fileSplits;
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
         NCFileSystemAdapter fsAdapter = new NCFileSystemAdapter(fileSplits, parserFactory, sourceDatatype, ctx);
         return fsAdapter;
     }
diff --git a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/PullBasedTwitterAdapterFactory.java b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/PullBasedTwitterAdapterFactory.java
index 9c137e1..81b73e7 100644
--- a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/PullBasedTwitterAdapterFactory.java
+++ b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/PullBasedTwitterAdapterFactory.java
@@ -39,7 +39,7 @@
     private static ARecordType recordType;
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
         return new PullBasedTwitterAdapter(configuration, ctx);
     }
 
diff --git a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/RSSFeedAdapterFactory.java b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/RSSFeedAdapterFactory.java
index cc366f6..c7f25b0 100644
--- a/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/RSSFeedAdapterFactory.java
+++ b/asterix-external-data/src/main/java/edu/uci/ics/asterix/external/adapter/factory/RSSFeedAdapterFactory.java
@@ -45,7 +45,7 @@
     private List<String> feedURLs = new ArrayList<String>();
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
         RSSFeedAdapter rssFeedAdapter = new RSSFeedAdapter(configuration, recordType, ctx);
         return rssFeedAdapter;
     }
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/ExternalDataScanOperatorDescriptor.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/ExternalDataScanOperatorDescriptor.java
index c5937f6..48c9a2c 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/ExternalDataScanOperatorDescriptor.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/ExternalDataScanOperatorDescriptor.java
@@ -51,7 +51,7 @@
                 writer.open();
                 IDatasourceAdapter adapter = null;
                 try {
-                    adapter = ((IAdapterFactory) adapterFactory).createAdapter(ctx);
+                    adapter = ((IAdapterFactory) adapterFactory).createAdapter(ctx, partition);
                     adapter.start(partition, writer);
                 } catch (Exception e) {
                     throw new HyracksDataException("exception during reading from external data source", e);
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/FeedIntakeOperatorDescriptor.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/FeedIntakeOperatorDescriptor.java
index 10884c2..1792e1d 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/FeedIntakeOperatorDescriptor.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/FeedIntakeOperatorDescriptor.java
@@ -70,7 +70,7 @@
         IngestionRuntime ingestionRuntime = (IngestionRuntime) FeedManager.INSTANCE.getFeedRuntime(feedRuntimeId);
         try {
             if (ingestionRuntime == null) {
-                adapter = (IFeedAdapter) adapterFactory.createAdapter(ctx);
+                adapter = (IFeedAdapter) adapterFactory.createAdapter(ctx, partition);
                 if (LOGGER.isLoggable(Level.INFO)) {
                     LOGGER.info("Beginning new feed:" + feedId);
                 }
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/IAdapterFactory.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/IAdapterFactory.java
index da4f131..f0a3aa4 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/IAdapterFactory.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/feeds/IAdapterFactory.java
@@ -82,9 +82,10 @@
      * Creates an instance of IDatasourceAdapter.
      * 
      * @param HyracksTaskContext
+     * @param partition
      * @return An instance of IDatasourceAdapter.
      * @throws Exception
      */
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception;
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception;
 
 }
diff --git a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/DataGenerator2.java b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/DataGenerator2.java
index ad7daaf..3fa7170 100644
--- a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/DataGenerator2.java
+++ b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/DataGenerator2.java
@@ -198,23 +198,27 @@
             message = randMessageGen.getNextRandomMessage();
             Point location = randLocationGen.getRandomPoint();
             DateTime sendTime = randDateGen.getNextRandomDatetime();
-            twMessage.reset(twMessageId + "", user, location, sendTime, message.getReferredTopics(), message);
+            twMessage.reset(twMessageId, user, location, sendTime, message.getReferredTopics(), message);
             twMessageId++;
             appender.appendToFile(twMessage.toString());
         }
     }
 
-    public Iterator<TweetMessage> getTwitterMessageIterator() {
-        return new TweetMessageIterator(duration);
+    public Iterator<TweetMessage> getTwitterMessageIterator(int partition, byte seed) {
+        return new TweetMessageIterator(duration, partition, seed);
     }
 
     public class TweetMessageIterator implements Iterator<TweetMessage> {
 
         private final int duration;
         private long startTime = 0;
-
-        public TweetMessageIterator(int duration) {
+        private int partition;
+        private final GULongIDGenerator idGen;
+        
+        public TweetMessageIterator(int duration,int partition, byte seed) {
             this.duration = duration;
+            this.partition = partition;
+            this.idGen = new GULongIDGenerator(partition, seed);
         }
 
         @Override
@@ -231,7 +235,7 @@
             Message message = randMessageGen.getNextRandomMessage();
             Point location = randLocationGen.getRandomPoint();
             DateTime sendTime = randDateGen.getNextRandomDatetime();
-            twMessage.reset(UUID.randomUUID().toString(), twUser, location, sendTime, message.getReferredTopics(),
+            twMessage.reset(idGen.getNextULong(), twUser, location, sendTime, message.getReferredTopics(),
                     message);
             twMessageId++;
             if (twUserId > numTwOnlyUsers) {
@@ -1273,7 +1277,7 @@
 
     public static class TweetMessage {
 
-        private String tweetid;
+        private long tweetid;
         private TwitterUser user;
         private Point senderLocation;
         private DateTime sendTime;
@@ -1284,7 +1288,7 @@
 
         }
 
-        public TweetMessage(String tweetid, TwitterUser user, Point senderLocation, DateTime sendTime,
+        public TweetMessage(long tweetid, TwitterUser user, Point senderLocation, DateTime sendTime,
                 List<String> referredTopics, Message messageText) {
             this.tweetid = tweetid;
             this.user = user;
@@ -1294,7 +1298,7 @@
             this.messageText = messageText;
         }
 
-        public void reset(String tweetid, TwitterUser user, Point senderLocation, DateTime sendTime,
+        public void reset(long tweetid, TwitterUser user, Point senderLocation, DateTime sendTime,
                 List<String> referredTopics, Message messageText) {
             this.tweetid = tweetid;
             this.user = user;
@@ -1308,7 +1312,7 @@
             StringBuilder builder = new StringBuilder();
             builder.append("{");
             builder.append("\"tweetid\":");
-            builder.append("\"" + tweetid + "\"");
+            builder.append("int64(\"" + tweetid + "\")");
             builder.append(",");
             builder.append("\"user\":");
             builder.append(user);
@@ -1340,11 +1344,11 @@
             return new String(builder);
         }
 
-        public String getTweetid() {
+        public long getTweetid() {
             return tweetid;
         }
 
-        public void setTweetid(String tweetid) {
+        public void setTweetid(long tweetid) {
             this.tweetid = tweetid;
         }
 
diff --git a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/GULongIDGenerator.java b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/GULongIDGenerator.java
new file mode 100644
index 0000000..59c133c
--- /dev/null
+++ b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/GULongIDGenerator.java
@@ -0,0 +1,32 @@
+package edu.uci.ics.asterix.tools.external.data;
+
+import java.nio.ByteBuffer;
+import java.util.concurrent.atomic.AtomicLong;
+
+public class GULongIDGenerator {
+
+    private final int partition;
+    private final long baseValue;
+    private final AtomicLong nextValue;
+
+    public GULongIDGenerator(int partition, byte seed) {
+        this.partition = partition;
+        ByteBuffer buffer = ByteBuffer.allocate(8);
+        buffer.put(seed);
+        buffer.put((byte) partition);
+        buffer.putInt(0);
+        buffer.putShort((short) 0);
+        buffer.flip();
+        this.baseValue = new Long(buffer.getLong());
+        this.nextValue = new AtomicLong(baseValue);
+    }
+
+    public long getNextULong() {
+        return nextValue.incrementAndGet();
+    }
+    
+    public int getPartition(){
+        return partition;
+    }
+ 
+}
diff --git a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/GenericSocketFeedAdapterFactory.java b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/GenericSocketFeedAdapterFactory.java
index 788bb4f..03c65c7 100644
--- a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/GenericSocketFeedAdapterFactory.java
+++ b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/GenericSocketFeedAdapterFactory.java
@@ -67,7 +67,7 @@
     }
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
         return new GenericSocketFeedAdapter(configuration, parserFactory, outputType, ctx);
     }
 
diff --git a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/RateControlledFileSystemBasedAdapterFactory.java b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/RateControlledFileSystemBasedAdapterFactory.java
index 40bc814..fb2ac1bd 100644
--- a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/RateControlledFileSystemBasedAdapterFactory.java
+++ b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/RateControlledFileSystemBasedAdapterFactory.java
@@ -63,8 +63,8 @@
     private ARecordType atype;
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
-        FileSystemBasedAdapter coreAdapter = (FileSystemBasedAdapter) adapterFactory.createAdapter(ctx);
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
+        FileSystemBasedAdapter coreAdapter = (FileSystemBasedAdapter) adapterFactory.createAdapter(ctx, partition);
         return new RateControlledFileSystemBasedAdapter(atype, configuration, coreAdapter, format, parserFactory, ctx);
     }
 
diff --git a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/SyntheticTwitterFeedAdapterFactory.java b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/SyntheticTwitterFeedAdapterFactory.java
index 11cbe54..baa7a63 100644
--- a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/SyntheticTwitterFeedAdapterFactory.java
+++ b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/SyntheticTwitterFeedAdapterFactory.java
@@ -106,7 +106,7 @@
     }
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
         return new SyntheticTwitterFeedAdapter(configuration, outputType, ctx);
     }
 
diff --git a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TweetGenerator2.java b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TweetGenerator2.java
index 6d0b1f9..b4db589 100644
--- a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TweetGenerator2.java
+++ b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TweetGenerator2.java
@@ -18,12 +18,10 @@
     public static final String KEY_TPS = "tps";
     public static final String KEY_MIN_TPS = "tps-min";
     public static final String KEY_MAX_TPS = "tps-max";
-
-
     public static final String KEY_TPUT_DURATION = "tput-duration";
-  
-    public static final String OUTPUT_FORMAT = "output-format";
+    public static final String KEY_GUID_SEED = "guid-seed";
 
+    public static final String OUTPUT_FORMAT = "output-format";
     public static final String OUTPUT_FORMAT_ARECORD = "arecord";
     public static final String OUTPUT_FORMAT_ADM_STRING = "adm-string";
 
@@ -32,18 +30,10 @@
     private int numTweetsBeforeDelay;
     private TweetMessageIterator tweetIterator = null;
     private long exeptionInterval;
-
-  
-
     private int partition;
     private int tweetCount = 0;
     private int frameTweetCount = 0;
     private int numFlushedTweets = 0;
-
-    public int getTweetCount() {
-        return tweetCount;
-    }
-
     private int exceptionPeriod = -1;
     private boolean isOutputFormatRecord = false;
     private byte[] EOL = "\n".getBytes();
@@ -52,6 +42,10 @@
     private ByteBuffer outputBuffer = ByteBuffer.allocate(32 * 1024);
     private int flushedTweetCount = 0;
 
+    public int getTweetCount() {
+        return tweetCount;
+    }
+
     public TweetGenerator2(Map<String, String> configuration, int partition, String format) throws Exception {
         String value = configuration.get(KEY_DURATION);
         duration = value != null ? Integer.parseInt(value) : 60;
@@ -59,12 +53,15 @@
         if (value != null) {
             exceptionPeriod = Integer.parseInt(value);
         }
-       
+
         isOutputFormatRecord = format.equalsIgnoreCase(OUTPUT_FORMAT_ARECORD);
         InitializationInfo info = new InitializationInfo();
         info.timeDurationInSecs = duration;
         dataGenerator = new DataGenerator2(info);
-        tweetIterator = dataGenerator.new TweetMessageIterator(duration);
+
+        String seedValue = configuration.get(KEY_GUID_SEED);
+        int seedInt = seedValue != null ? Integer.parseInt(seedValue) : 0;
+        tweetIterator = dataGenerator.new TweetMessageIterator(duration, partition, (byte) seedInt);
     }
 
     private void initializeTweetRate(String tps) {
diff --git a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TwitterFirehoseFeedAdapter.java b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TwitterFirehoseFeedAdapter.java
index 5739c70..be09685 100644
--- a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TwitterFirehoseFeedAdapter.java
+++ b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TwitterFirehoseFeedAdapter.java
@@ -43,9 +43,9 @@
     private ExecutorService executorService = Executors.newCachedThreadPool();
 
     public TwitterFirehoseFeedAdapter(Map<String, String> configuration, ITupleParserFactory parserFactory,
-            ARecordType outputtype, IHyracksTaskContext ctx) throws Exception {
+            ARecordType outputtype, IHyracksTaskContext ctx, int partition) throws Exception {
         super(parserFactory, outputtype, ctx);
-        this.twitterServer = new TwitterServer(configuration, outputtype, executorService);
+        this.twitterServer = new TwitterServer(configuration, outputtype, executorService, partition);
         this.twitterClient = new TwitterClient(twitterServer.getPort());
     }
 
@@ -68,7 +68,7 @@
         private int port = -1;
         private ExecutorService executorService;
 
-        public TwitterServer(Map<String, String> configuration, ARecordType outputtype, ExecutorService executorService)
+        public TwitterServer(Map<String, String> configuration, ARecordType outputtype, ExecutorService executorService, int partition)
                 throws Exception {
             int numAttempts = 0;
             while (port < 0) {
@@ -86,7 +86,7 @@
                 LOGGER.info("Twitter server configured to use port: " + port);
             }
             String dvds = configuration.get("dataverse-dataset");
-            listener = new Listener(serverSocket, configuration, outputtype, dvds);
+            listener = new Listener(serverSocket, configuration, outputtype, dvds, partition);
             this.executorService = executorService;
         }
 
@@ -155,9 +155,9 @@
         }
 
         public Listener(ServerSocket serverSocket, Map<String, String> configuration, ARecordType outputtype,
-                String datasetName) throws Exception {
+                String datasetName, int partition) throws Exception {
             this.serverSocket = serverSocket;
-            this.tweetGenerator = new TweetGenerator2(configuration, 0, TweetGenerator.OUTPUT_FORMAT_ADM_STRING);
+            this.tweetGenerator = new TweetGenerator2(configuration, partition, TweetGenerator.OUTPUT_FORMAT_ADM_STRING);
             String value = configuration.get(KEY_MODE);
             String confValue = null;
             if (value != null) {
diff --git a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TwitterFirehoseFeedAdapterFactory.java b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TwitterFirehoseFeedAdapterFactory.java
index 1d8a607..b18a5f2 100644
--- a/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TwitterFirehoseFeedAdapterFactory.java
+++ b/asterix-tools/src/main/java/edu/uci/ics/asterix/tools/external/data/TwitterFirehoseFeedAdapterFactory.java
@@ -107,8 +107,8 @@
     }
 
     @Override
-    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx) throws Exception {
-        return new TwitterFirehoseFeedAdapter(configuration, parserFactory, outputType, ctx);
+    public IDatasourceAdapter createAdapter(IHyracksTaskContext ctx, int partition) throws Exception {
+        return new TwitterFirehoseFeedAdapter(configuration, parserFactory, outputType, ctx, partition);
     }
 
     @Override
@@ -130,7 +130,7 @@
                     "message-text" };
 
             AUnorderedListType unorderedListType = new AUnorderedListType(BuiltinType.ASTRING, "referred-topics");
-            IAType[] fieldTypes = new IAType[] { BuiltinType.ASTRING, userRecordType, BuiltinType.APOINT,
+            IAType[] fieldTypes = new IAType[] { BuiltinType.AINT64, userRecordType, BuiltinType.APOINT,
                     BuiltinType.ADATETIME, unorderedListType, BuiltinType.ASTRING };
             outputType = new ARecordType("TweetMessageType", fieldNames, fieldTypes, false);