hadoop-hdfs-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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


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



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-dev-unsubscribe@hadoop.apache.org
For additional commands, e-mail: hdfs-dev-help@hadoop.apache.org


Mime
View raw message