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From "Suresh Thalamati (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-555) Unable to restart after disk is full
Date Tue, 27 Sep 2005 00:02:03 GMT
    [ http://issues.apache.org/jira/browse/DERBY-555?page=comments#action_12330529 ] 

Suresh Thalamati commented on DERBY-555:
----------------------------------------

Hi Øystein, 

Tested your patch ,  it looks good .    I have couple of minor questions,   related to the
 new error message  :
Database located at C:\suresht\databases\wombat has been booted in READ ONLY mod
e. This will occur when the database is located in a jar file.  This may also ha
ppen when Derby is not able to write to the database directory; either because i
t does not have the required access rights or because the disk is full.

1) New Message added will be displayed  on  every boot  from a read only media ,  Not sure
if 
this  will be  annoying to  the users who are booting  derby  from a read-only media ?  

2) Above Message added will never be  displayed  when booted from a JAR file.   reference
to jar in read-only mode ("... This will occur when the database is located in a jar file
...) may not be needed. 

--

How about modifying the general boot message to indicate that  the database is booted in 
read-only mode ? and  document the special case of disk full scenario some where ? 

I agree with you that  there is no simple way to write a disk full test cases that can be
added to nightly runs.  But if you have a test case ,  I  think  it might be  good idea  to
 create special  ad-hoc test   directory and put it there ,   so that some one interested
can run them manually  at the time of a  release.
 
On a quick scan through the docs,  found   a section  "Booting databases"  section in the
Developers guide("http://db.apache.org/derby/docs/10.1/devguide/) ; may be we can mention
the disk full read-only boot  special case there as a note. 

Thanks
-suresht


> Unable to restart after disk is full
> ------------------------------------
>
>          Key: DERBY-555
>          URL: http://issues.apache.org/jira/browse/DERBY-555
>      Project: Derby
>         Type: Bug
>   Components: Store
>     Versions: 10.2.0.0
>  Environment: Sun Sparc Solaris, 1.4 JDK, Derby Client/Server
>     Reporter: Øystein Grøvlen
>     Assignee: Øystein Grøvlen
>     Priority: Critical
>  Attachments: derby-555.diff
>
> 1. Inserted data into the database until the disk was full. (5 clients inserting into
5 different tables in parallel.)
> 2. Shut down the server
> 3. Start the database again without freeing any disk space.
> When I try to start the database again, I get Null-pointer-exception, regardless of how
I connect (have tried embedded, client server, ij, jdbc applications).  I have not tried to
free some space on the disk before starting.  
> The call stack is not available right now (the computer I used had to be shut down due
to problems with our cooling system), but the exception comes from the following line in RawStore.java:
>      properties.put(Attribute.LOG_DEVICE, logFactory.getCanonicalLogPath());
> getCanonicalLogPath() returns null which results in a NPE in the hash table.
> A quick debug before the computer was stopped, showed that the logFactory was an instance
of org.apache.derby.impl.store.raw.log.ReadOnly which always returns null in its  getCanonicalLogPath().
> I suspect this may be related to the fact that I ran with the log in a non-default location.

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