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https://issues.apache.org/jira/browse/HADOOP-12831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15170707#comment-15170707
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Steve Loughran commented on HADOOP-12831:
-----------------------------------------
+1
> LocalFS/FSOutputSummer NPEs in constructor if bytes per checksum set to 0
> --------------------------------------------------------------------------
>
> Key: HADOOP-12831
> URL: https://issues.apache.org/jira/browse/HADOOP-12831
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Assignee: Mingliang Liu
> Priority: Minor
> Attachments: HADOOP-12831.000.patch, HADOOP-12831.001.patch,
> HADOOP-12831.002.patch
>
>
> If you set the number of bytes per checksum to zero,
> {code}
> conf.setInt(LocalFileSystemConfigKeys.LOCAL_FS_BYTES_PER_CHECKSUM_KEY, 0)
> {code}
> then create a "file://" instance, you get to see a stack trace
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