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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3571) LOB locators are not released if the LOB columns are not accessed by the client
Date Thu, 27 Mar 2008 16:17:24 GMT

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

Kristian Waagan updated DERBY-3571:
-----------------------------------

    Attachment: derby-3571-1b-client_track_lob_fix.diff

'derby-3571-1b-client_track_lob_fix.diff' replaces version 1a.
It addresses the comments made by Knut Anders, and the following changes:
 * LOB state object properly initialized
 * Check if positioned on insert row before checking current row (see the closeX-method).
 * Changed some state maintenance in LOBStateTracker.

I ran suites.All without failures (except the JMX failure), but I made some last minutes changes
so I'm rerunning.
I plan to get this code into 10.3, 10.4 and trunk. The optimization will be handled under
a separate JIRA and will only go into 10.4 and trunk.

> 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, 10.4.1.0, 10.5.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>         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
>
>
> 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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