fredia commented on code in PR #20860:
URL: https://github.com/apache/flink/pull/20860#discussion_r981058808
##########
flink-runtime/src/main/java/org/apache/flink/runtime/state/memory/ByteStreamStateHandle.java:
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@@ -148,7 +148,7 @@ public int read(byte[] b, int off, int len) throws
IOException {
index += bytesToCopy;
return bytesToCopy;
} else {
- return -1;
+ return len == 0 ? 0 : -1;
Review Comment:
Thanks for pointing this out, after rethinking the semantics of `read()`, I
think changing the
[NoFetchingInput#readBytes()](https://github.com/apache/flink/blob/9d2ae5572897f3e2d9089414261a250cfc2a2ab8/flink-core/src/main/java/org/apache/flink/api/java/typeutils/runtime/NoFetchingInput.java#L115-L140)
is a better way to go.
As
https://docs.oracle.com/javase/8/docs/api/java/io/FileInputStream.html#read--
explained,
> Returns:
the total number of bytes read into the buffer, or -1 if there is no more
data because the end of the file has been reached.
We should keep the semantics of `read()` consistent.
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