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Subject [GitHub] [flink] zhijiangW commented on a change in pull request #7911: [FLINK-11082][network] Fix the logic of getting backlog in sub partition
Date Tue, 12 Mar 2019 02:51:48 GMT
zhijiangW commented on a change in pull request #7911: [FLINK-11082][network] Fix the logic
of getting backlog in sub partition
URL: https://github.com/apache/flink/pull/7911#discussion_r264503784
 
 

 ##########
 File path: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/SpillableSubpartitionView.java
 ##########
 @@ -156,7 +156,8 @@ public BufferAndBacklog getNextBuffer() throws IOException, InterruptedException
 				checkState(nextBuffer.isFinished(),
 					"We can only read from SpillableSubpartition after it was finished");
 
-				newBacklog = parent.decreaseBuffersInBacklogUnsafe(nextBuffer.isBuffer());
+				parent.decreaseBuffersInBacklog(nextBuffer.isBuffer());
+				newBacklog = parent.getBuffersInBacklog();
 
 Review comment:
   1. The current backlog is based on `flushTriggered` or `finished` status after changing,
if we want to return backlog during `decreaseBuffersInBacklog`, we might need to pass these
info into `decreaseBuffersInBacklog(boolean `flushTriggered` | `finished`)`. In order not
to dirty this method, I split it into a separate method. Maybe it does not seem so bad if
passing parameter into `decreaseBuffersInBacklog `. So we could still merge these two into
one method if you prefer.
   
   2. Yes, you are right. Here we could get backlog in unsafe way, no need to add the synchronized
overhead.

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