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From Oystein.Grov...@Sun.COM (Øystein Grøvlen)
Subject Re: [jira] Updated: (DERBY-555) Unable to restart after disk is full
Date Mon, 26 Sep 2005 15:11:28 GMT

Could someone look at my patch?  I would also like comments on my
questions on testing and documentation.


>>>>> "ØG(" == Øystein Grøvlen (JIRA) <derby-dev@db.apache.org> writes:

    ØG(>      [ http://issues.apache.org/jira/browse/DERBY-555?page=all ]
    ØG(> Øystein Grøvlen updated DERBY-555:
    ØG(> ----------------------------------

    ØG(>     Attachment: derby-555.diff

    ØG(> I have attached a patch that aims to resolve this issue as follows:

    ØG(> - If database is set to read-only, print a message in derby.log about this.
    ØG(> - If the database is read-only, do not worry about log path.  This avoids the
null pointer exception. 

    ØG(> The following files are changed:
    ØG(> M      java/engine/org/apache/derby/impl/store/raw/RawStore.java
    ØG(> M      java/engine/org/apache/derby/impl/store/raw/data/BaseDataFileFactory.java
    ØG(> M      java/engine/org/apache/derby/iapi/reference/MessageId.java
    ØG(> M      java/engine/org/apache/derby/loc/messages_en.properties

    ØG(> If this fix is applied, the database will boot in read-only mode if there is
not free disk space in the database directory.  A message of this will then be printed to
derby.log.  This is far from an ideal solution since an application that experience this will
not get any warning/error when connecting.  However, if it laters tries to modify data, it
will get exceptions like "ERROR 25502: An SQL data change is not permitted for a read-only
connection, user or database".  I think many Derby users will be confused by this message
since I am not sure the aspects of read-only connections/users/databases are well known to
most Derby   users.

    ØG(> I guess the documentation should be updated to inform about this, but I am not
quite sure where to put it.  Any suggestions?

    ØG(> I have not made any tests for this.  Do people think it is necessary?  It is
a bit difficult to make a standard test that fills disk devices.  I could experiment to see
if I can get the same NPE problem with a read-only database.

    >> 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:
    >> 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
    >> I suspect this may be related to the fact that I ran with the log in a non-default

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