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https://issues.apache.org/jira/browse/HADOOP-9119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510519#comment-13510519
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Steve Loughran commented on HADOOP-9119:
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I propose new tests that write to the same file with: less data, more data, the
same amount of data -and a different set of data in each. The byte-by-byte
verification will pick up any situation where the old data is somehow mixed
with the new data.
> Add test to FileSystemContractBaseTest to verify integrity of overwritten
> files
> -------------------------------------------------------------------------------
>
> Key: HADOOP-9119
> URL: https://issues.apache.org/jira/browse/HADOOP-9119
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Steve Loughran
> Priority: Minor
>
> The test {{FileSystemContractBaseTest.testOverwrite()}} is meant to verify
> that overwrites work -but it only overwrites a zero byte file with some data
> and only checks for length. This can hide problems where there overwrite was
> somehow corrupted.
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