c-f-cooper commented on PR #8596:
URL: https://github.com/apache/hudi/pull/8596#issuecomment-1528941416
> Hi, can you elaborate a little more what would happen if the inputstream
is not closed properly? Can you write a test case to demonstrate the resolution
of the issue.
To demonstrate the issue of unclosed IO streams, I can write the following
test program:
`import java.io.*;
public class UnclosedIOTest {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new
InputStreamReader(System.in));
BufferedWriter writer = new BufferedWriter(new
FileWriter("output.txt"));
System.out.print("Please enter a line of text:");
String line = reader.readLine();
writer.write(line);
System.out.println("Written to output.txt");
}
}
`
This program uses an unclosed BufferedReader and an unclosed BufferedWriter.
When the program runs, the user will be prompted to enter a line of text, and
the program will write this line of text to a file called output.txt. However,
because the BufferedReader and BufferedWriter are not closed, it can lead to
the following issues:
Resource leakage: When the program is run repeatedly, a new BufferedReader
and BufferedWriter will be created each time, but the old IO streams are not
closed, and they will continue to occupy system resources, which may eventually
cause the system or program to crash.
Data loss: If an exception occurs while writing data and the BufferedWriter
is not closed, the written data may be lost because they have not been flushed
to the disk yet.
To solve these issues, you should add the following code at the end of the
program to close the IO streams:
`reader.close();
writer.close();
`
This will ensure that the program correctly releases the IO resources.
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