Libin Qin created FLINK-32509:
---------------------------------
Summary: avoid using skip in InputStreamFSInputWrapper.seek
Key: FLINK-32509
URL: https://issues.apache.org/jira/browse/FLINK-32509
Project: Flink
Issue Type: Bug
Components: API / Core
Affects Versions: 1.18.0
Reporter: Libin Qin
The implementation of InputStream does not return -1 for eof.
The java doc of InputStream said "The skip method may, for a variety of
reasons, end up skipping over some smaller number of bytes, possibly 0."
For FileInputStream, it allows skipping any number of bytes past the end of the
file.
So the method "seek" of InputStreamFSInputWrapper will cause infinite loop if
desired exceed end of file
I reproduced with following case
```java
byte[] bytes = "flink".getBytes();
try (InputStream inputStream = new ByteArrayInputStream(bytes)) {
InputStreamFSInputWrapper wrapper = new InputStreamFSInputWrapper(inputStream);
wrapper.seek(20);
}
```
I found an issue of commons-io talks about the problem of skip
https://issues.apache.org/jira/browse/IO-203
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