dongjoon-hyun commented on code in PR #54280:
URL: https://github.com/apache/spark/pull/54280#discussion_r2797263654
##########
core/src/test/scala/org/apache/spark/deploy/history/EventLogFileWritersSuite.scala:
##########
@@ -160,8 +160,148 @@ abstract class EventLogFileWritersSuite extends
SparkFunSuite with LocalSparkCon
expectedLines: Seq[String] = Seq.empty): Unit
}
+/**
+ * A test OutputStream that simulates IO errors.
+ */
+class ErrorThrowingOutputStream extends OutputStream {
+ var throwOnWrite: Boolean = false
+ var throwOnFlush: Boolean = false
+ var throwOnClose: Boolean = false
+
+ override def write(b: Int): Unit = {
+ if (throwOnWrite) {
+ throw new IOException("Simulated write error")
+ }
+ }
+
+ override def write(b: Array[Byte], off: Int, len: Int): Unit = {
+ if (throwOnWrite) {
+ throw new IOException("Simulated write error")
+ }
+ }
+
+ override def flush(): Unit = {
+ if (throwOnFlush) {
+ throw new IOException("Simulated flush error")
+ }
+ }
+
+ override def close(): Unit = {
+ if (throwOnClose) {
+ throw new IOException("Simulated close error")
Review Comment:
The test case matches Spark's code's exception message like the following.
Instead of this test suite string.
```
assert(warningMessages.exists(_.contains("Spark detects errors while
flushing")),
```
```
assert(warningMessages.exists(_.contains("Spark detects errors while
closing")),
```
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