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From Gervais Mickaël (JIRA) <j...@apache.org>
Subject [jira] [Created] (HDFS-10393) Unable to append to a SequenceFile with Compression.NONE.
Date Thu, 12 May 2016 08:30:13 GMT
Gervais Mickaël created HDFS-10393:

             Summary: Unable to append to a SequenceFile with Compression.NONE.
                 Key: HDFS-10393
                 URL: https://issues.apache.org/jira/browse/HDFS-10393
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.7.2
            Reporter: Gervais Mickaël
            Priority: Critical


I'm trying to use the append functionnality to an existing _SequenceFile_.

If I set _Compression.NONE_, it works when the file is created, but when the file already
exists I've a _NullPointerException_, by the way it works if I specify a compression with
a codec.

{code:title=Failing code|borderStyle=solid}
Option compression = compression(CompressionType.NONE);
Option keyClass = keyClass(LongWritable.class);
Option valueClass = valueClass(BytesWritable.class);
Option out = file(dfs);
Option append = appendIfExists(true);

writer = createWriter(conf,

The following exeception is thrown when the file exists because compression option is checked:

Exception in thread "main" java.lang.NullPointerException
	at org.apache.hadoop.io.SequenceFile$Writer.<init>(SequenceFile.java:1119)
	at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:273)

This is due to the *codec* which is _null_:

 if (readerCompressionOption.value != compressionTypeOption.value
                || !readerCompressionOption.codec.getClass().getName()
                    .equals(compressionTypeOption.codec.getClass().getName())) {
              throw new IllegalArgumentException(
                  "Compression option provided does not match the file");



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