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https://issues.apache.org/jira/browse/FLINK-7456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324465#comment-16324465
]
ASF GitHub Bot commented on FLINK-7456:
---------------------------------------
Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/4552#discussion_r161247589
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/SequenceNumberingViewReader.java
---
@@ -77,6 +92,46 @@ void requestSubpartitionView(
}
}
+ /**
+ * The credits from consumer are added in incremental way.
+ *
+ * @param creditDeltas The credit deltas
+ */
+ public void addCredit(int creditDeltas) {
+ numCreditsAvailable += creditDeltas;
+ }
+
+ /**
+ * Updates the value to indicate whether the reader is enqueued in the
pipeline or not.
+ *
+ * @param isRegisteredAvailable True if this reader is already enqueued
in the pipeline.
+ */
+ public void notifyAvailabilityChanged(boolean isRegisteredAvailable) {
+ this.isRegisteredAvailable = isRegisteredAvailable;
+ }
+
+ public boolean isRegisteredAvailable() {
+ return isRegisteredAvailable;
+ }
+
+ /**
+ * Check whether this reader is available or not.
+ *
+ * <p>Return true only if the next buffer is event or the reader has
both available
+ * credits and buffers.
+ */
+ public boolean isAvailable() {
+ if (numBuffersAvailable.get() <= 0) {
+ return false;
+ }
+
+ if (subpartitionView.nextBufferIsEvent() || numCreditsAvailable
> 0) {
--- End diff --
how about checking `numCreditsAvailable` first since that's the cheaper
check?
> Implement Netty sender incoming pipeline for credit-based
> ---------------------------------------------------------
>
> Key: FLINK-7456
> URL: https://issues.apache.org/jira/browse/FLINK-7456
> Project: Flink
> Issue Type: Sub-task
> Components: Network
> Reporter: zhijiang
> Assignee: zhijiang
> Fix For: 1.5.0
>
>
> This is a part of work for credit-based network flow control.
> On sender side, each subpartition view maintains an atomic integer
> {{currentCredit}} from receiver. Once receiving the messages of
> {{PartitionRequest}} and {{AddCredit}}, the {{currentCredit}} is added by
> deltas.
> Each view also maintains an atomic boolean field to mark it as registered
> available for transfer to make sure it is enqueued in handler only once. If
> the {{currentCredit}} increases from zero and there are available buffers in
> the subpartition, the corresponding view will be enqueued for transferring
> data.
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