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https://issues.apache.org/jira/browse/FLINK-10727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16670149#comment-16670149
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ASF GitHub Bot commented on FLINK-10727:
----------------------------------------
NicoK closed pull request #6974: [FLINK-10727][network] remove unnecessary
synchronization in SingleInputGate#requestPartitions()
URL: https://github.com/apache/flink/pull/6974
This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:
As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):
diff --git
a/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/SingleInputGate.java
b/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/SingleInputGate.java
index f51dc7417ab..2856ca1c33a 100644
---
a/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/SingleInputGate.java
+++
b/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/SingleInputGate.java
@@ -477,26 +477,28 @@ public boolean isFinished() {
@Override
public void requestPartitions() throws IOException,
InterruptedException {
- synchronized (requestLock) {
- if (!requestedPartitionsFlag) {
- if (isReleased) {
- throw new
IllegalStateException("Already released.");
- }
+ if (requestedPartitionsFlag) {
+ return;
+ }
- // Sanity checks
- if (numberOfInputChannels !=
inputChannels.size()) {
- throw new IllegalStateException("Bug in
input gate setup logic: mismatch between" +
- "number of total input
channels and the currently set number of input " +
- "channels.");
- }
+ synchronized (requestLock) {
+ if (isReleased) {
+ throw new IllegalStateException("Already
released.");
+ }
- for (InputChannel inputChannel :
inputChannels.values()) {
-
inputChannel.requestSubpartition(consumedSubpartitionIndex);
- }
+ // Sanity checks
+ if (numberOfInputChannels != inputChannels.size()) {
+ throw new IllegalStateException("Bug in input
gate setup logic: mismatch between" +
+ "number of total input channels
and the currently set number of input " +
+ "channels.");
}
- requestedPartitionsFlag = true;
+ for (InputChannel inputChannel :
inputChannels.values()) {
+
inputChannel.requestSubpartition(consumedSubpartitionIndex);
+ }
}
+
+ requestedPartitionsFlag = true;
}
//
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> Remove unnecessary synchronization in SingleInputGate#requestPartitions()
> -------------------------------------------------------------------------
>
> Key: FLINK-10727
> URL: https://issues.apache.org/jira/browse/FLINK-10727
> Project: Flink
> Issue Type: Improvement
> Components: Network
> Affects Versions: 1.5.5, 1.6.2, 1.7.0
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Major
> Labels: pull-request-available
>
> For every {{SingleInputGate#getNextBufferOrEvent()}},
> {{SingleInputGate#requestPartitions()}} is called and this always
> synchronizes on the {{requestLock}} before checking the
> {{requestedPartitionsFlag}}. Since {{SingleInputGate#requestPartitions()}} is
> only called from the same thread (the task thread getting the record), it is
> enough to check the {{requestedPartitionsFlag}} first before synchronizing
> for the actual requests (if needed). {{UnionInputGate}} already goes the same
> way in its {{requestPartitions()}} implementation.
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