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https://issues.apache.org/jira/browse/HADOOP-16021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16729649#comment-16729649
]
asin commented on HADOOP-16021:
-------------------------------
I have upload "all my code" above [~Jack-Lee]
> SequenceFile.createWriter appendIfExists codec cause NullPointerException
> -------------------------------------------------------------------------
>
> Key: HADOOP-16021
> URL: https://issues.apache.org/jira/browse/HADOOP-16021
> Project: Hadoop Common
> Issue Type: Bug
> Components: common
> Affects Versions: 2.7.3
> Environment: windows10, hadoop2.7.3, jdk8
> Reporter: asin
> Priority: Major
> Labels: bug
> Attachments: 57.png
>
>
>
> I want append the data in a file , when i use SequenceFile.appendIfExists ,
> it throw NullPointerException at at
> org.apache.hadoop.io.SequenceFile$Writer.(SequenceFile.java:1119)
> when i remove the 'appendIfExists', it works, but it will cover old file.
>
> when i try use CompressionType.RECORD or CompressionType.BLOCK throw "not
> support" exception
>
> {code:java}
> // my code
> SequenceFile.Writer writer = null;
> writer = SequenceFile.createWriter(conf,
> SequenceFile.Writer.file(path),
> SequenceFile.Writer.keyClass(Text.class),
> SequenceFile.Writer.valueClass(Text.class),
> SequenceFile.Writer.appendIfExists(true) );
> {code}
>
> {code:java}
> // all my code
> public class Writer1 implements VoidFunction<Iterator<Tuple2<String,
> String>>> {
> private static Configuration conf = new Configuration();
> private int MAX_LINE = 3; // little num,for test
> @Override
> public void call(Iterator<Tuple2<String, String>> iterator) throws
> Exception {
> int partitionId = TaskContext.get().partitionId();
> int count = 0;
> SequenceFile.Writer writer = null;
> while (iterator.hasNext()) {
> Tuple2<String, String> tp = iterator.next();
> Path path = new Path("D:/tmp-doc/logs/logs.txt");
> if (writer == null)
> writer = SequenceFile.createWriter(conf,
> SequenceFile.Writer.file(path),
> SequenceFile.Writer.keyClass(Text.class),
> SequenceFile.Writer.valueClass(Text.class),
> SequenceFile.Writer.appendIfExists(true)
> );
> writer.append(new Text(tp._1), new Text(tp._2));
> count++;
> if (count > MAX_LINE) {
> IOUtils.closeStream(writer);
> count = 0;
> writer = SequenceFile.createWriter(... // same as above
> }
> }
> if (count > 0) {
> IOUtils.closeStream(writer);
> }
> IOUtils.closeStream(writer);
> }
> }
> {code}
>
> {{more info
> see:[https://stackoverflow.com/questions/53943978/hadoop-sequencefile-createwriter-appendifexists-codec-cause-nullpointerexception]}}
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