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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3811) ArrayIndexOutOfBoundsException in BasePage.getHeaderAtSlot accessing modified Clob with READ_UNCOMMITTED isolation
Date Wed, 12 Aug 2009 07:09:14 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742244#action_12742244
] 

Kristian Waagan commented on DERBY-3811:
----------------------------------------

Thanks for checking, Kathey.

I was just thinking about studying the corrupted page itself. Being an "ad-hoc" procedure,
I don't have any concrete steps for you.
I guess waiting for another chance to look at a corrupted page is a better option, but if
you have some spare time:
 - Is the page all nulls?
 - Is it an overflow page?
 - Does the slot table look correct?
 - Is the checksum(s) correct?
   (I'm thinking Derby should have detected it if it isn't?)
 - Does the various flags look okay?
   (decoding these are cumbersome unless you have a tool...)
 - Are there any other rows on the page, and are these valid)

I think the first questions are easier to answer, then the answers get harder to obtain as
you go down the list...
Also, are you able to run the consistency checker? Or does it fail with the same error?

I haven't checked if the original repro corrupts the database, so that's something that should
be checked as well (I won't have time to do this now, but maybe later).

> 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
>
>
> 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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