On Monday 14 July 2008 06:56, Daniel Cheng wrote:
> On Sun, Jul 13, 2008 at 1:38 AM, <toad at freenetproject.org> wrote:
> > Author: toad
> > Date: 2008-07-12 17:38:13 +0000 (Sat, 12 Jul 2008)
> > New Revision: 21115
> >
> > Modified:
> >
branches/db4o/freenet/src/freenet/support/io/PersistentEncryptedTempBucketFactory.java
> > Log:
> > Document another anti-OOM hack.
> >
> > Modified:
branches/db4o/freenet/src/freenet/support/io/PersistentEncryptedTempBucketFactory.java
> > ===================================================================
> > ---
branches/db4o/freenet/src/freenet/support/io/PersistentEncryptedTempBucketFactory.java
2008-07-12 17:29:21 UTC (rev 21114)
> > +++
branches/db4o/freenet/src/freenet/support/io/PersistentEncryptedTempBucketFactory.java
2008-07-12 17:38:13 UTC (rev 21115)
> > @@ -33,6 +33,10 @@
> > // return bf.bf ==
persistentTempBucketFactory;
> > // }
> > // });
> > + // REDFLAG:
> > + // Constraining on bf causes an OOM for Cooo on db4o
6.4.48.10991. Commenting out bf below fixes it.
> > + // Neither of the below log messages was logged ... which
suggests something very strange is happening in db4o.
>
> db4o do a query-by-example on constrain() ---- all primitive field /
> string are compared, null fields are ignored, some other object might
> work (i have no idea on when would it work). It does not expect you
> specifying a complex object there.
Then how do you constrain to an exact value? Db4o's indexes are all by exact
pointer, never by value.
>
> persistentTempBucketFactory have a Random / RandomSource field, which
> can be problematic.
It's transient.
>
> > + // FIXME EVIL DB4O BUG - if can replicate, file a bug...
but it didn't happen to me, on the same version, also on linux, so it may not
be replicable.
> > Query query = container.query();
> >
query.constrain(PersistentEncryptedTempBucketFactory.class);
>
> //query.descend("bf").constrain(persistentTempBucketFactory);
>
> and use a .and() here.
Doh! That may be what I've been missing in several places.
If you don't do and(), what happens?
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