Merge pull request #68 from andyqzb/master

ORListener block for new events to reduce cpu usage

Author: chavdar

databus2-relay/databus2-event-producer-or/src/main/java/com/linkedin/databus2/producers/ORListener.java

@@ -136,6 +136,9 @@ public interface TransactionProcessor
   /** Shared queue to transfer binlog events from OpenReplicator to ORlistener thread **/
   private BlockingQueue<BinlogEventV4> _binlogEventQueue = null;
 
+  /** Milli sec timeout for _binlogEventQueue operation **/
+  private long _queueTimeoutMs = 100L;
+
   public ORListener(String name,
                     int currentFileNumber,
                     Logger log,
@@ -144,7 +147,8 @@ public ORListener(String name,
                     Map<String, Short> tableUriToSrcIdMap,
                     Map<String, String> tableUriToSrcNameMap,
                     SchemaRegistryService schemaRegistryService,
-                    int maxQueueSize)
+                    int maxQueueSize,
+                    long queueTimeoutMs)
   {
     super("ORListener_" + name);
     _log = log;
@@ -155,6 +159,7 @@ public ORListener(String name,
     _schemaRegistryService = schemaRegistryService;
     _currFileNum = currentFileNumber;
     _binlogEventQueue = new LinkedBlockingQueue<BinlogEventV4>(maxQueueSize);
+    _queueTimeoutMs = queueTimeoutMs;
   }
 
   @Override
@@ -163,7 +168,7 @@ public void onEvents(BinlogEventV4 event)
     boolean isPut = false;
     do {
       try {
-        isPut = _binlogEventQueue.offer(event, 100, TimeUnit.MILLISECONDS);
+        isPut = _binlogEventQueue.offer(event, _queueTimeoutMs, TimeUnit.MILLISECONDS);
       } catch (InterruptedException e) {
         _log.error("failed to put binlog event to binlogEventQueue event: " + event, e);
       }
@@ -638,9 +643,24 @@ public void run() {
 
       eventList.clear();
       int eventNumber = _binlogEventQueue.drainTo(eventList);
+      if (eventNumber == 0)
+      {
+        try
+        {
+          event = _binlogEventQueue.poll(_queueTimeoutMs, TimeUnit.MILLISECONDS);
+          if (event != null)
+          {
+            eventList.add(event);
+            eventNumber = eventList.size();
+          }
+        }
+        catch (InterruptedException e)
+        {
+          _log.info("Interrupted when poll from _binlogEventQueue!!");
+        }
+      }
       for (int i = 0; i < eventNumber; i++)
       {
-
         event = eventList.get(i);
         if (event == null)
         {

databus2-relay/databus2-event-producer-or/src/main/java/com/linkedin/databus2/producers/OpenReplicatorEventProducer.java

@@ -330,7 +330,7 @@ void initOpenReplicator(long scn)
       String binlogFile = String.format("%s.%06d", _binlogFilePrefix, logid);
       // we should use a new ORListener to drop the left events in binlogEventQueue and the half processed transaction.
       _orListener = new ORListener(_sourceName, logid, _log, _binlogFilePrefix, _producerThread, _tableUriToSrcIdMap,
-          _tableUriToSrcNameMap, _schemaRegistryService, 200);
+          _tableUriToSrcNameMap, _schemaRegistryService, 200, 100L);
 
       _or.setBinlogFileName(binlogFile);
       _or.setBinlogPosition(offset);