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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3811) ArrayIndexOutOfBoundsException in BasePage.getHeaderAtSlot accessing modified Clob with READ_UNCOMMITTED isolation
Date Wed, 23 Jun 2010 16:16:50 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan updated DERBY-3811:
-----------------------------------

    Attachment: derby-3811-1a-LOBLocksTest.diff
                LOBLocksTest.html

Attaching a basic LOB locking test as patch 1a.
I'm also attaching the JavaDoc as HTML for easier reading (reading the overall test description
may help).

I'm seeing failures with when running this test. It would be nice if someone could verify
if the test is doing the right things.
You can expect to see eight or nine errors when running the tests.
For the record, I think the test exposes more than one problem.


Test ready for review.

> ArrayIndexOutOfBoundsException in BasePage.getHeaderAtSlot accessing modified Clob with
READ_UNCOMMITTED isolation
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3811
>                 URL: https://issues.apache.org/jira/browse/DERBY-3811
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.5.1.1
>            Reporter: Kristian Waagan
>         Attachments: ClobStabilityTest.java, derby-3811-1a-LOBLocksTest.diff, LOBLocksTest.html
>
>
> The attached Java program does the following, using two concurrent threads for the last
part.
>  a) Inserts a  1 MB Clob.
>  b) UpdateThread changes the Clob to a 0.5 MB Clob, then sleeps for 5 seconds before
it performs a rollback.
>  c) SelectThread selects the Clob and calls Clob.length().
> Both threads/connections run with READ_UNCOMMITTED isolation and with autocommit off.
> Running the attached Java program results in the following exception:
> 1217602873292 :: Using isolation level READ_UNCOMMITTED (1)
> 1217602873341 :: <<UpdateThread>> Starting update.
> 1217602873649 :: <<UpdateThread>> Update completed!
> 1217602875305 :: <<SelectThread>> Executing select query...
> 1217602875328 :: <<SelectThread>> Getting Clob object...
> java.sql.SQLException: Java exception: '-1: java.lang.ArrayIndexOutOfBoundsException'.
>         at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:95)
>         at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Util.java:87)
>         at org.apache.derby.impl.jdbc.Util.javaException(Util.java:244)
>         at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:403)
>         at org.apache.derby.impl.jdbc.EmbedResultSet.noStateChangeException(EmbedResultSet.java:4386)
>         at org.apache.derby.impl.jdbc.StoreStreamClob.noStateChangeLOB(StoreStreamClob.java:292)
>         at org.apache.derby.impl.jdbc.StoreStreamClob.getCharLength(StoreStreamClob.java:170)
>         at org.apache.derby.impl.jdbc.EmbedClob.length(EmbedClob.java:175)
>         at ClobStabilityTest$SelectThread.myRun(ClobStabilityTest.java:102)
>         at ClobStabilityTest$SelectThread.run(ClobStabilityTest.java:87)
>         at java.lang.Thread.run(Thread.java:619)
> Caused by: java.sql.SQLException: Java exception: '-1: java.lang.ArrayIndexOutOfBoundsException'.
>         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)
>         ... 10 more
> Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
>         at org.apache.derby.impl.store.raw.data.BasePage.getHeaderAtSlot(BasePage.java:1794)
>         at org.apache.derby.impl.store.raw.data.StoredPage.restorePortionLongColumn(StoredPage.java:5816)
>         at org.apache.derby.impl.store.raw.data.OverflowInputStream.fillByteHolder(OverflowInputStream.java:151)
>         at org.apache.derby.impl.store.raw.data.BufferedByteHolderInputStream.read(BufferedByteHolderInputStream.java:44)
>         at java.io.DataInputStream.read(DataInputStream.java:132)
>         at org.apache.derby.impl.jdbc.PositionedStoreStream.read(PositionedStoreStream.java:106)
>         at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
>         at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
>         at org.apache.derby.iapi.util.UTF8Util.internalSkip(UTF8Util.java:111)
>         at org.apache.derby.iapi.util.UTF8Util.skipUntilEOF(UTF8Util.java:59)
>         at org.apache.derby.impl.jdbc.StoreStreamClob.getCharLength(StoreStreamClob.java:167)
>         ... 4 more
> 1217602878848 :: <<UpdateThread>> Rolling back!
> Is the Java program valid, and should this work?

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