[jira] Resolved: (DERBY-3571) LOB locators are not released if the LOB columns are not accessed by the client

["Kristian Waagan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-3571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kristian Waagan resolved DERBY-3571.
------------------------------------

       Resolution: Fixed
    Fix Version/s: 10.4.1.2

Backported the fix (trunk revision 643819) to the 10.4 branch with revision 645438.
I will file another Jira for the comments Knut Anders posted, as they should be addressed if we decide not to throw exceptions for accessing a LOB column multiple times (in the non-stream cases).

> LOB locators are not released if the LOB columns are not accessed by the client
> -------------------------------------------------------------------------------
>
>                 Key: DERBY-3571
>                 URL: https://issues.apache.org/jira/browse/DERBY-3571
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Network Client
>    Affects Versions: 10.3.2.1, 10.4.0.0, 10.5.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For: 10.4.1.2, 10.5.0.0
>
>         Attachments: derby-3571-1a-client_track_lob_fix.diff, derby-3571-1a-client_track_lob_fix.stat, derby-3571-1b-client_track_lob_fix.diff, derby-3571-1c-client_track_lob_fix.diff, derby-3571-1d-client_track_lob_fix.diff, derby-3571-1e-client_track_lob_fix.diff, derby-3571-2a-simple_release.diff, derby-3571-2a-simple_release.stat
>
>
> If the client creates a result set containing LOB locator columns and iterates through it without actually accessing the LOB columns, the locators are not released.
> The amount of locators and their associated LOB objects causes the server to consume large amounts of memory and it eventually gets an OOME.
> There are a few workarounds for this bug:
>  a) Access and/or properly close the LOBs (i.e. Blob.free).
>     This is partly dependent on DERBY-2892.
>  b) Invoke Connection.commit (or rollback) periodically, which causes all locators on the connection to be released.

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