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Posted to common-issues@hadoop.apache.org by "Vinayakumar B (JIRA)" <ji...@apache.org> on 2016/05/12 10:03:12 UTC
[jira] [Moved] (HADOOP-13138) Unable to append to a SequenceFile
with Compression.NONE.
[ https://issues.apache.org/jira/browse/HADOOP-13138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vinayakumar B moved HDFS-10393 to HADOOP-13138:
-----------------------------------------------
Affects Version/s: (was: 2.7.2)
2.7.2
Component/s: (was: hdfs-client)
Key: HADOOP-13138 (was: HDFS-10393)
Project: Hadoop Common (was: Hadoop HDFS)
> Unable to append to a SequenceFile with Compression.NONE.
> ---------------------------------------------------------
>
> Key: HADOOP-13138
> URL: https://issues.apache.org/jira/browse/HADOOP-13138
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.7.2
> Reporter: Gervais Mickaël
> Assignee: Vinayakumar B
> 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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