zhangjun0x01 commented on a change in pull request #1704:
URL: https://github.com/apache/iceberg/pull/1704#discussion_r522594622
##########
File path:
flink/src/test/java/org/apache/iceberg/flink/actions/TestRewriteDataFilesAction.java
##########
@@ -280,4 +280,91 @@ public void testRewriteLargeTableHasResiduals() throws
IOException {
// Assert the table records as expected.
SimpleDataUtil.assertTableRecords(icebergTableUnPartitioned, expected);
}
+
+ /**
+ * a test case to test avoid repeate compress
+ * <p>
+ * If datafile cannot be combined to CombinedScanTask with other DataFiles,
the size of the CombinedScanTask list size
+ * is 1, so we remove these CombinedScanTasks to avoid compressed repeatedly.
+ * <p>
+ * In this test case,we generated 3 data files and set targetSizeInBytes
greater than the largest file size so that
+ * it cannot be combined a CombinedScanTask with other datafiles. The
datafile with the largest file size will not be
+ * compressed.
+ * <p>
+ * For the same data, the file sizes of different formats are different. The
file sizes of different formats generated
+ * by the data in the current test case are as follows:
+ * <p>
+ * avro :
+ * size file
+ * 408 00000-0-5a218337-1742-4ed1-83d8-55e301da49b8-00001.avro
+ * 2390 00000-0-8f431924-ec8d-4957-a238-b8fe2b136210-00001.avro
+ * 408 00000-0-9c75bcc4-49f0-4722-9528-c1d5faa50fa7-00001.avro
+ *
+ * orc :
+ * size file
+ * 1626 00000-0-260d42d1-f00f-4c5f-9628-5f41f6395093-00001.orc
+ * 331 00000-0-942fd38b-d7af-4ad2-a985-0e6ccdb4d8d3-00001.orc
+ * 333 00000-0-ad8f2c34-6cf7-43fe-990f-f8f6389d198e-00001.orc
+ *
+ * parquet :
+ * size file
+ * 611 00000-0-84e1fd63-a840-4a23-983f-5247e9218cbe-00001.parquet
+ * 611 00000-0-91b070f0-7d17-487c-97ec-de0f0b09aa31-00001.parquet
+ * 2691 00000-0-e09c969d-d6ee-4a41-9e42-9dcbf42bc4e1-00001.parquet
+ *
+ * @throws IOException IOException
+ */
+ @Test
+ public void testRewriteAvoidRepeateCompress() throws IOException {
+ List<String> records = Lists.newArrayList();
+ List<Record> expected = Lists.newArrayList();
+ for (int i = 0; i < 500; i++) {
+ String data = String.valueOf(i) + "hello iceberg,hello flink";
+ records.add("(" + i + ",'" + data + "')");
Review comment:
This is to construct a file with a larger file size to distinguish the
other two small files, so that we can compress the other two small files
without compressing the large file. If the three files are similar in size, we
will not be able to do the rewrite
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
