[jira] [Updated] (DERBY-4805) Increase the length of the RDBNAM field in the DRDA implementation

["Mamta A. Satoor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-4805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mamta A. Satoor updated DERBY-4805:
-----------------------------------

    Attachment: DERBY4805_patch4_stat.txt
                DERBY4805_patch4_diff.txt

Attaching patch DERBY4805_patch4_diff.txt which is ready for commit. It will allow RDBNAM to be 1024 bytes, thus lifting the limit from current 255bytes. I have changed the existing boundary test case to test for the new limit but the tests now use in-memory db jdbc url since on disk long urls were running into problem because of OS/file system limitation on the length of file name length. If there are no further comments, I will go ahead and commit the patch on Thursday. 
As for newer client(version 10.11 and higher) going against an older server(10.10 and lower which will not have the fix for DERBY-4805 and hence will not accept the longer RDBNAM) with new RDBNAM limit, it will result in protocol exception. This is because when the client makes the first connect request to server, it has no way of knowing what server version it is talking to and hence there is no way to catch the length violation on the client side at this point. I will go ahead and log a jira for this behavior. Hopefully there won't be many user environments where client and server are at different version levels and trying to give a really long db name.

> Increase the length of the RDBNAM field in the DRDA implementation
> ------------------------------------------------------------------
>
>                 Key: DERBY-4805
>                 URL: https://issues.apache.org/jira/browse/DERBY-4805
>             Project: Derby
>          Issue Type: Improvement
>          Components: Network Client, Network Server
>    Affects Versions: 10.7.1.1
>            Reporter: Tiago R. Espinha
>            Assignee: Mamta A. Satoor
>              Labels: derby_triage10_9
>         Attachments: DERBY4805_patch2_diff.txt, DERBY4805_patch2_stat.txt, DERBY4805_patch3_diff.txt, DERBY4805_patch3_stat.txt, DERBY4805_patch4_diff.txt, DERBY4805_patch4_stat.txt, DERBY_4805_diff_patch1.txt
>
>
> Currently, whenever the client driver is used, there is a limit of 255 bytes for the database name. This is defined by the DRDA spec and there has been a discussion on the list [1]/[2] as to whether this limit should be raised due to the introduction of the new ACR that allows for UTF-8 characters.
> UTF-8 characters can take up to four bytes and this reduces the limit in characters dramatically.
> This should be an easy change as there is a codepoint that defines this limit.
> [1] did not work but [2] did
> [1] - http://old.nabble.com/Database-name-length-tt29691419.html
> [2]http://apache-database.10148.n7.nabble.com/Database-name-length-td33182.html



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