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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8531) SequenceFile Writer can throw out a better error if a serializer or deserializer isn't available
Date Mon, 16 Jul 2012 08:53:36 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414934#comment-13414934
] 

Hudson commented on HADOOP-8531:
--------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #2497 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2497/])
    HADOOP-8531. SequenceFile Writer can throw out a better error if a serializer or deserializer
isn't available. Contributed by Madhukara Phatak. (harsh) (Revision 1361933)

     Result = FAILURE
harsh : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1361933
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/SequenceFile.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/TestSequenceFile.java

                
> SequenceFile Writer can throw out a better error if a serializer or deserializer isn't
available
> ------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8531
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8531
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 2.0.0-alpha
>            Reporter: Harsh J
>            Assignee: madhukara phatak
>            Priority: Trivial
>              Labels: newbie
>         Attachments: HADOOP-8531-1.patch, HADOOP-8531-2.patch, HADOOP-8531-2.patch, HADOOP-8531.patch
>
>
> Currently, if the provided Key/Value class lacks a proper serializer in the loaded config
for the SequenceFile.Writer, we get an NPE as the null return goes unchecked.
> Hence we get:
> {code}
> java.lang.NullPointerException
> 	at org.apache.hadoop.io.SequenceFile$Writer.init(SequenceFile.java:1163)
> 	at org.apache.hadoop.io.SequenceFile$Writer.<init>(SequenceFile.java:1079)
> 	at org.apache.hadoop.io.SequenceFile$RecordCompressWriter.<init>(SequenceFile.java:1331)
> 	at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:271)
> {code}
> We can provide a better message + exception in such cases. This is slightly related to
MAPREDUCE-2584.

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