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_r265856906
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/ResultSubpartition.java
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@@ -118,13 +117,19 @@ protected Throwable getFailureCause() {
/**
* Gets the number of non-event buffers in this subpartition.
- *
- * <p><strong>Beware:</strong> This method should only be used in tests
in non-concurrent access
- * scenarios since it does not make any concurrency guarantees.
*/
- @VisibleForTesting
- public int getBuffersInBacklog() {
- return buffersInBacklog;
+ public abstract int getBuffersInBacklog();
+
+ /**
+ * @param lastBufferAvailable whether the last buffer in this
subpartition is available for consumption
+ * @return the number of non-event buffers in this subpartition
+ */
+ protected int getBuffersInBacklog(boolean lastBufferAvailable) {
Review comment:
Yes, it makes sense to keep the `Unsafe` here consistent with
`decreaseBuffersInBacklog`.
In another aspect, the existence of `Unsafe` is for distinguishing the
different usages compared with `safe`. For `getBuffersInBacklog` there might
need only one way for use either `safe` or `Unsafe`. Anyway I am willing to
make it `Unsafe` here, then we could avoid explaining it in method comments.
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