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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3811) ArrayIndexOutOfBoudsException in BasePage.getHeaderAtSlot accessing modified Clob with READ_UNCOMMITTED isolation
Date Fri, 01 Aug 2008 15:06:34 GMT
ArrayIndexOutOfBoudsException 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: 10.5.0.0
            Reporter: Kristian Waagan
         Attachments: ClobStabilityTest.java

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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