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https://issues.apache.org/jira/browse/MAPREDUCE-6891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Schäfer resolved MAPREDUCE-6891.
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Resolution: Duplicate
> TextInputFormat: duplicate records with custom delimiter
> --------------------------------------------------------
>
> Key: MAPREDUCE-6891
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6891
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: Till Schäfer
>
> When using a custom delimiter for TextInputFormat, the resulting blocks are
> not correct under some circumstances. It happens that the total number of
> records is wrong and some entries are duplicated.
> I have created a reproducible test case:
> Generate a File
> {code:bash}
> for i in $(seq 1 10000000); do
> echo -n $i >> long_delimiter-1to10000000-with_newline.txt;
> echo "--------------------------------------------" >>
> long_delimiter-1to10000000-with_newline.txt;
> done
> {code}
> Java-Test to reproduce the error
> {code:java}
> public static void longDelimiterBug(JavaSparkContext sc) {
> Configuration hadoopConf = new Configuration();
> String delimitedFile = "long_delimiter-1to10000000-with_newline.txt";
> hadoopConf.set("textinputformat.record.delimiter",
> "--------------------------------------------\n");
> JavaPairRDD<LongWritable, Text> input =
> sc.newAPIHadoopFile(delimitedFile, TextInputFormat.class,
> LongWritable.class, Text.class, hadoopConf);
> List<String> values = input.map(t -> t._2.toString()).collect();
> Assert.assertEquals(10000000, values.size());
> for (int i = 0; i < 10000000; i++) {
> boolean correct = values.get(i).equals(Integer.toString(i + 1));
> if (!correct) {
> logger.error("Wrong value for index {}: expected {} ->
> got {}", i, i + 1, values.get(i));
> } else {
> logger.info("Correct value for index {}: expected {} ->
> got {}", i, i + 1, values.get(i));
> }
> Assert.assertTrue(correct);
> }
> }
> {code}
> This example fails with the error
> {quote}
> java.lang.AssertionError: expected:<10000000> but was:<10042616>
> {quote}
> when commenting out the Assert about the size of the collection, my log
> output ends like this:
> {quote}
> [main] INFO edu.udo.cs.schaefer.testspark.Main - Correct value for index
> 663244: expected 663245 -> got 663245
> [main] ERROR edu.udo.cs.schaefer.testspark.Main - Wrong value for index
> 663245: expected 663246 -> got 660111
> {quote}
> After the the wrong value for index 663245 the values are sorted again an a
> continuing with 660112, 660113, ....
> The error is not reproducible with _\n_ as delimiter, i.e. when not using a
> custom delimiter.
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