[jira] [Created] (HDFS-10393) Unable to append to a SequenceFile with Compression.NONE.

[JIRA]

Gervais Mickaël created HDFS-10393:
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             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


Hi,

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,
             out,
             append,
             compression,
             keyClass,
             valueClass);
{code}

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

{code}
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)
{code}

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

{code:title=SequenceFile.java|borderStyle=solid}
 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");
            }
{code}


Thansk 

Mickaël



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