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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2992) getBinaryStream returns incorrect result (truncated value) if underlying blob is deleted
Date Tue, 09 Feb 2010 17:39:27 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kristian Waagan updated DERBY-2992:

    Attachment: derby-2992-1a-throw_exception_on_eof.diff

Attached patch 1a, which fixes the problem as outlined in the comment above. I also incorporated
the repro/test Kathey has written.
Should we try to say something about what went wrong in the error message, such that the user
has a chance to understand what went wrong?

Patch ready for review.

> getBinaryStream returns incorrect result (truncated value) if underlying blob is deleted
> ----------------------------------------------------------------------------------------
>                 Key: DERBY-2992
>                 URL: https://issues.apache.org/jira/browse/DERBY-2992
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions:,,
>            Reporter: Kathey Marsden
>         Attachments: derby-2992-1a-throw_exception_on_eof.diff, TruncatedBlob.java
> If getBinaryStream is reading a value (READ_UNCOMMITTED) and the row is deleted by another
connection, a truncated value will be returned without error. I believe instead either the
whole value or an IOException should occur.
> With 10.2 and higher with the repro attahed we get:
> > java TruncatedBlob
> Embedded:
> Read 32669 bytes
> 0 rows in BLOBCLOB
> With 10.1
> Embedded:
> Read 40000 bytes (OK)
> 0 rows in BLOBCLOB 
> Note network server returns the full value for both 10.1 and 10.2 but gives a lock timeout
for 10.2+.  I will file a separate issue for that.

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