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From "madhukara phatak (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8531) SequenceFile Writer can throw out a better error if a serializer isn't available
Date Sun, 01 Jul 2012 10:08:53 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

madhukara phatak updated HADOOP-8531:
-------------------------------------

    Attachment: HADOOP-8531-1.patch

Hi Harsha,
 Thanks for reviewing patch. I have updated the patch which fixes style issues and error messages.
Deserializer code already has null checks , so I think there is no need of any change in them.
                
> SequenceFile Writer can throw out a better error if a serializer isn't available
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-8531
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8531
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Harsh J
>            Assignee: madhukara phatak
>            Priority: Trivial
>              Labels: newbie
>         Attachments: HADOOP-8531-1.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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