JingGe commented on a change in pull request #17501:
URL: https://github.com/apache/flink/pull/17501#discussion_r771626315
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File path:
flink-connectors/flink-connector-files/src/main/java/org/apache/flink/connector/file/src/reader/StreamFormat.java
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@@ -157,6 +166,88 @@
long splitEnd)
throws IOException;
+ /**
+ * Creates a new reader to read in this format. This method is called when
a fresh reader is
+ * created for a split that was assigned from the enumerator. This method
may also be called on
+ * recovery from a checkpoint, if the reader never stored an offset in the
checkpoint (see
+ * {@link #restoreReader(Configuration, Path, long, long, long)} for
details.
+ *
+ * <p>Provide the default implementation, subclasses are therefore not
forced to implement it.
+ * Compare to the {@link #createReader(Configuration, FSDataInputStream,
long, long)}, This
+ * method put the focus on the {@link Path}. The default implementation
adapts information given
+ * by method arguments to {@link FSDataInputStream} and calls {@link
+ * #createReader(Configuration, FSDataInputStream, long, long)}.
+ *
+ * <p>If the format is {@link #isSplittable() splittable}, then the {@code
inputStream} is
+ * positioned to the beginning of the file split, otherwise it will be at
position zero.
+ */
+ default StreamFormat.Reader<T> createReader(
+ Configuration config, Path filePath, long splitOffset, long
splitLength)
+ throws IOException {
Review comment:
the commit of adding two default methods has been dropped.
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