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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3611) ERROR XSDG2: Invalid checksum on Page occurs during mass inserts into two-column bigint PK table
Date Thu, 10 Apr 2008 11:50:11 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12587605#action_12587605

Knut Anders Hatlen commented on DERBY-3611:

Some of the problems found in DERBY-3347 could lead to corruption on page 0, so yes, it might
be related.

> ERROR XSDG2: Invalid checksum on Page occurs during mass inserts into two-column bigint
PK table
> ------------------------------------------------------------------------------------------------
>                 Key: DERBY-3611
>                 URL: https://issues.apache.org/jira/browse/DERBY-3611
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions:,
>         Environment: Occurred on 6 separate quad-core machines running either Vista,
Vista SP1 and Server 2008.  Also seen on AMD64 dual core 4200 with 4 GB of ram running 32
bit XP pro.
>            Reporter: David Sitsky
>            Priority: Critical
>         Attachments: derby-worker0.log, derby-worker3.log, derby-worker4.log
> The original extensive email thread reporting this issue can be seen from here: http://www.nabble.com/ERROR-XSDG2%3A-Invalid-checksum-on-Page-Page%280%2CContainer%280%2C-1313%29%29-td16389697.html.
> I have an intensive data-processing application which utilises Apache Derby, using 6
quad-core machines running Vista SP1 and/or Vista Server 2008.  Each quad-core machine typically
runs 4 separate JVM worker processes, each running their own embedded derby database.
> I have found after 5 or 10 hours of processing, one or a couple of my worker processes,
start reporting the following error in their derby.log file:
> ERROR XSDG2: Invalid checksum on Page Page(0,Container(0, 1313)) 
> The worker process never seems to recover.  Derby locates the error, reboots the database,
but seems to inevitably report the same error again.  I have tried both and
with the same results.  The conglomerate and page number is always the same.
> I know it is not a hardware issue, as this is across 6 separate machines, and it has
happened with software / hardware raid, and no disk errors have been reported.  A customer
of our software also reported this error occurring on their AMD64 dual core 4200 with 4 GB
of ram running 32 bit XP pro.
> The table the conglomerate refers to is as follows:
> CREATE TABLE text_table (guidhigh BIGINT NOT NULL,
>                          guid BIGINT NOT NULL,
>                          data BLOB (1G) NOT NULL,
>                          PRIMARY KEY (guidhigh, guid)) 
> In this application, essentially random values for guidhigh and guid were being created,
with data being compressed text, that could range from anything from a few bytes to many megabytes
in size.
> The processing code effectively did a select from the table on guidhigh and guid to check
if an entry exists, before inserting a new row within a transaction.
> If I forceable shut the application down, I could connect to the database using ij, and
would get the same error:
> ij> select count(*) from text_table;
> ERROR XSDG2: Invalid checksum on Page Page(0,Container(0, 1313)), expected=304,608,373,
on-disk version=2,462,088,751, page dump follows: Hex dump:
> 00000000: 0076 0000 0001 0000 0000 0000 27ea 0000  .v..............
> 00000010: 0000 0006 0000 0000 0000 0000 0000 0000  ................
> 00000020: 0000 0000 0001 0000 0000 0000 0000 0000  ................
> .... 
> A workaround which we managed to implement in our application, as suggested from derby-user
via Stanley Bradbury,  was to not have the PK during the load, which we managed to implement.
 We also replaced the two column PK with a single column and the problem has since never occurred.
> I'll attach a number of example derby.log files which contain the error messages.

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