RussellSpitzer commented on a change in pull request #2196:
URL: https://github.com/apache/iceberg/pull/2196#discussion_r569602777
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File path:
spark/src/test/java/org/apache/iceberg/actions/TestRewriteDataFilesAction.java
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@@ -311,6 +320,76 @@ public void testRewriteLargeTableHasResiduals() {
Assert.assertEquals("Rows must match", records, actualRecords);
}
+ @Test
+ public void testRewriteDataFilesForLargeFile() throws IOException,
AnalysisException {
+ PartitionSpec spec = PartitionSpec.unpartitioned();
+ Map<String, String> options = Maps.newHashMap();
+ Table table = TABLES.create(SCHEMA, spec, options, tableLocation);
+ Assert.assertNull("Table must be empty", table.currentSnapshot());
+
+ List<Record> excepted = Lists.newArrayList();
+ Record baseRecord = GenericRecord.create(SCHEMA);
+
+ GenericAppenderFactory genericAppenderFactory = new
GenericAppenderFactory(SCHEMA);
+ int count = 0;
+ File file = temp.newFile();
+ try (FileAppender<Record> fileAppender =
+ genericAppenderFactory.newAppender(Files.localOutput(file),
FileFormat.PARQUET)) {
+ int fileSize = 10000;
+ for (; fileAppender.length() < fileSize; count++) {
+ Record record = baseRecord.copy();
+ record.setField("c1", count);
+ record.setField("c2", "foo" + count);
+ record.setField("c3", "bar" + count);
+ fileAppender.add(record);
+ excepted.add(record);
+ }
+ }
+
+ DataFile dataFile = DataFiles.builder(table.spec())
+ .withPath(file.getAbsolutePath())
+ .withFileSizeInBytes(file.length())
+ .withFormat(FileFormat.PARQUET)
+ .withRecordCount(count)
+ .build();
+
+ table.newAppend().appendFile(dataFile).commit();
+
+ List<ThreeColumnRecord> records1 = Lists.newArrayList(
+ new ThreeColumnRecord(1, "BBBBBBBBBB", "BBBB"),
+ new ThreeColumnRecord(1, "DDDDDDDDDD", "DDDD")
+ );
+ writeRecords(records1);
+
+ table.refresh();
+
+ CloseableIterable<FileScanTask> tasks = table.newScan().planFiles();
+ List<DataFile> dataFiles =
Lists.newArrayList(CloseableIterable.transform(tasks, FileScanTask::file));
+ Assert.assertEquals("Should have 3 scan tasks before rewrite", 3,
dataFiles.size());
Review comment:
Ah yeah I think I was mistaken here, I think we may be generating
multiple files via the writeRecords method which could potentially parallelize
the write resulting in multiple files. (This is for the 2 record file)
Instead we would need to do a repartition(1) to insure a single file is
written.
In my internal test I just did the repartition to make sure we had a single
file writes
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