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From Mike Matrigali <mikem_...@sbcglobal.net>
Subject Re: [jira] Commented: (DERBY-606) SYSCS_UTIL.SYSCS_INPLACE_COMPRESS_TABLE fails on (very) large tables
Date Fri, 17 Nov 2006 18:08:57 GMT
The comment in this test is that lock escalation is a problem for the 
test, not that Derby does something incorrect by doing the lock 
escalation.  Lock escalation is handled fine by derby, it is just that 
this test expects only row locks.  The issue with this test is that it 
uses multiple connections and expects them in some cases to
be working on the same table while the other thread holds locks.  If 
lock escalation happens then one thread gets a table level lock and the
other thread can't do what the test expects.

Mayuresh Nirhali (JIRA) wrote:
>     [ http://issues.apache.org/jira/browse/DERBY-606?page=comments#action_12450785 ]

>             
> Mayuresh Nirhali commented on DERBY-606:
> ----------------------------------------
> 
> I looked at the OnlineCompressTest and realized that to reproduce this case, the simplest
way is to increase the number of rows added to the table in one of the existing testcases.
However, I see a following comment in the testcase,
> 
> <snip>
>      * 4000 rows  - reasonable number of pages to test out, still 1 alloc page
>      *
>      * note that row numbers greater than 4000 may lead to lock escalation
>      * issues, if queries like "delete from x" are used to delete all the 
>      * rows.
> </snip>
> 
> This is very relevant to the testcase which I would like to add and so, would like to
know the Lock Escalation issue here. Has anyone seen this kind of issue before ? any pointers
??
> 
> The repro attached to the bug has almost similar testcase, I have not seen any problems
with that so far. So, it might be that the Lock Escalation issue has already been fixed. (I
did not find any related JIRA for this though). Can someone please confirm this ?? I can update
the comments if that problem has been fixed.
> 
> Thanks
> 
> 
> 
>>SYSCS_UTIL.SYSCS_INPLACE_COMPRESS_TABLE fails on (very) large tables
>>--------------------------------------------------------------------
>>
>>                Key: DERBY-606
>>                URL: http://issues.apache.org/jira/browse/DERBY-606
>>            Project: Derby
>>         Issue Type: Bug
>>         Components: Store
>>   Affects Versions: 10.1.1.0
>>        Environment: Java 1.5.0_04 on Windows Server 2003 Web Edition
>>           Reporter: Jeffrey Aguilera
>>        Assigned To: Mayuresh Nirhali
>>            Fix For: 10.3.0.0
>>
>>        Attachments: A606Test.java, derby606_v1.diff
>>
>>
>>SYSCS_UTIL.SYSCS_INPLACE_COMPRESS_TABLE fails with one of the following error messages
when applied to a very large table (>2GB):
>>Log operation null encounters error writing itself out to the log stream, this could
be caused by an errant log operation or internal log buffer full due to excessively large
log operation. SQLSTATE: XJ001: Java exception: ': java.io.IOException'.
>>or
>>The exception 'java.lang.ArrayIndexOutOfBoundsException' was thrown while evaluating
an expression. SQLSTATE: XJ001: Java exception: ': java.lang.ArrayIndexOutOfBoundsException'.
>>In either case, no entry is written to the console log or to derby.log.
> 
> 


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