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From GitBox <...@apache.org>
Subject [GitHub] [incubator-nemo] johnyangk commented on a change in pull request #223: [NEMO-388] Off-heap memory management (reuse ByteBuffer)
Date Mon, 05 Aug 2019 07:58:26 GMT
johnyangk commented on a change in pull request #223: [NEMO-388] Off-heap memory management
(reuse ByteBuffer)
URL: https://github.com/apache/incubator-nemo/pull/223#discussion_r310453227
 
 

 ##########
 File path: runtime/executor/src/main/java/org/apache/nemo/runtime/executor/bytetransfer/ByteOutputContext.java
 ##########
 @@ -247,8 +246,24 @@ private void writeDataFrame(final Object body, final long length) throws
IOExcep
         throw new IOException("Stream already closed.");
       }
       channel.writeAndFlush(DataFrameEncoder.DataFrame.newInstance(getContextId(), body,
length, newSubStream))
+        .addListener((ChannelFutureListener) future -> {
+          if (future.isSuccess()) {
+            if (partitionToRelease != null) {
 
 Review comment:
   There's potentially a race condition here: `partitionToRelease` is set after `channel.writeAndFlush`.
   If `writeAndFlush` completes quickly, then this listener can be invoked before `partitionToRelease`
is set, in which case it fails to release the partition.

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