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https://issues.apache.org/jira/browse/TAJO-999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14092364#comment-14092364
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ASF GitHub Bot commented on TAJO-999:
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Github user blrunner commented on the pull request:
https://github.com/apache/tajo/pull/110#issuecomment-51737133
Thanks @hyunsik. :)
> SequenceFile key class need to be compatible.
> ---------------------------------------------
>
> Key: TAJO-999
> URL: https://issues.apache.org/jira/browse/TAJO-999
> Project: Tajo
> Issue Type: Bug
> Components: storage
> Reporter: Jaehwa Jung
> Assignee: Jaehwa Jung
> Fix For: 0.9.0
>
>
> Currently, tajo uses ByteWritable class for key class in SequenceFile. If we
> used ByteWritable class for key class, it is no problem. But if we use
> another class for key class, we must find IOException. For example, When I
> used LongWritable class for key class in TextSerde, I found error as follows:
> {code:xml}
> ERROR org.apache.tajo.worker.Task: wrong key class:
> org.apache.hadoop.io.BytesWritable is not class
> org.apache.hadoop.io.LongWritable
> java.io.IOException: wrong key class: org.apache.hadoop.io.BytesWritable is
> not class org.apache.hadoop.io.LongWritable
> at
> org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:2251)
> at
> org.apache.tajo.storage.sequencefile.SequenceFileScanner.next(SequenceFileScanner.java:147)
> {code}
> Thus, we need to improve SequenceFileScanner and SequenceFileScannerAppender
> compatible for all writable classes.
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