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From "Mike Matrigali (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-4923) update of a long row can fail with ERROR nospc: nospc.U exception.
Date Fri, 20 Jul 2012 16:33:34 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mike Matrigali updated DERBY-4923:
----------------------------------

    Assignee:     (was: Mike Matrigali)

i had plans to look at this, but not top of my list.  unassiging it for now and will change
if I am actively working on it.
                
> update of a long row can fail with ERROR nospc: nospc.U exception.
> ------------------------------------------------------------------
>
>                 Key: DERBY-4923
>                 URL: https://issues.apache.org/jira/browse/DERBY-4923
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.5.3.0, 10.6.1.0, 10.6.2.1
>            Reporter: Mike Matrigali
>              Labels: derby_triage10_8
>         Attachments: derby.log, derby4923repro.diff
>
>
> An update of a row fails with a nospc.U exception.  If there is space on the disk then
an update should never fail for a space 
> issue.  The code is meant to always reserve enough space on a page such that if an expanding
update happens that does not
> fit, it should in the worst case change the row to an overflow row pointer and put the
rest in a linked overflow chain.
> The following set of circumstances will cause this bug (not sure which are exactly needed
- just what i did to
> cause the repro), I will be attaching a test case:
> The row being updated has the following characteristics:
>     o located on 4k page
>     o 2 colum row with 2nd column a blob column
>     o the row is a long row with first piece having 1st column on main page, and the
2nd piece having just blob column on overflow page.
>     o before the update there is 0 free space on the overflow page.
>     o the update causes the blob column to expand past 4k 
> Caused by: java.sql.SQLException: nospc.U
>     at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
>     at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(SQLExceptionFactory40.java:119)
>     at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:70)
>     ... 39 more
> Caused by: ERROR nospc: nospc.U
>     at org.apache.derby.impl.store.raw.data.StoredPage.logRow(StoredPage.java:4155)
>     at org.apache.derby.impl.store.raw.data.UpdateOperation.writeOptionalDataToBuffer(UpdateOperation.java:255)
>     at org.apache.derby.impl.store.raw.data.UpdateOperation.<init>(UpdateOperation.java:106)
>     at org.apache.derby.impl.store.raw.data.LoggableActions.actionUpdate(LoggableActions.java:80)
>     at org.apache.derby.impl.store.raw.data.StoredPage.doUpdateAtSlot(StoredPage.java:8625)
>     at org.apache.derby.impl.store.raw.data.BasePage.updateAtSlot(BasePage.java:1062)
>     at org.apache.derby.impl.store.access.conglomerate.GenericConglomerateController.replace(GenericConglomerateController.java:486)
>     at org.apache.derby.impl.sql.execute.RowChangerImpl.updateRow(RowChangerImpl.java:523)
>     at org.apache.derby.impl.sql.execute.UpdateResultSet.collectAffectedRows(UpdateResultSet.java:569)
>     at org.apache.derby.impl.sql.execute.UpdateResultSet.open(UpdateResultSet.java:264)
>     at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(GenericPreparedStatement.java:436)
>     at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPreparedStatement.java:317)
>     at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedStatement.java:1241)
>     ... 33 more

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