pnowojski commented on a change in pull request #11687:
[FLINK-16536][network][checkpointing] Implement InputChannel state recovery for
unaligned checkpoint
URL: https://github.com/apache/flink/pull/11687#discussion_r406825039
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/RemoteInputChannel.java
##########
@@ -149,16 +154,58 @@ void assignExclusiveSegments() throws IOException {
}
}
+ /**
+ * Reads the channel state data executed by netty thread, so it can
make use of almost all the
+ * existing processes to avoid bringing additional race conditions with
task thread. Also it can
+ * avoid introducing another thread pool to handle this work to make
things more complex.
+ */
+ private void readInputChannelState() throws IOException {
+ while (true) {
+ Buffer buffer;
+ synchronized (bufferQueue) {
+ buffer = bufferQueue.takeBuffer();
+ if (buffer == null) {
+ if (isReleased()) {
+ return;
+ }
+
+ buffer =
inputGate.getBufferPool().requestBuffer();
+ if (buffer != null) {
+
bufferQueue.addFloatingBuffer(buffer);
+ continue;
+ } else {
+
inputGate.getBufferProvider().addBufferListener(this);
+ isWaitingForStateBuffers = true;
+ return;
+ }
+ }
+ }
+
+ ChannelStateReader.ReadResult result =
inputGate.stateReader.readInputData(channelInfo, buffer);
Review comment:
`stateReader.readInputData` is not thread safe as it is currently and this
`readInputChannelState` method can be executed by netty threads concurrently
for different channels, right?
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