Okay, I have created a small patch that seems to fix my problems. It can be downloaded at http://cedarsoft.de/tmp/terracotta_compatibility_patch.patch
I am not sure whether that is enough for terracotta support, but for me it works so far. And I don't understand whether I have added a pitfall to Joda time. The problem is that org.joda.time.base.AbstractPartial#compareTo compares the field types using "!=" but when using a cluster those instances are not identical. So I have added a simple "equals" method to org.joda.time.DateTimeFieldType.StandardDateTimeFieldType. At the moment I use that patched version successfully. It would be great if anyone could take a look at that patch and give some comments whether that is a valid change that could be added to the trunk. Regards, Johannes Schneider On Wed, 2008-03-26 at 19:35 +0100, Johannes Schneider wrote: > I forced Terracotta to share all static fields within > org.joda.time.DateTimeFieldType. > Without that the methods "isAfter", "isBefore" etc. fail with that > exception: > > Exception in thread "Thread-12" java.lang.ClassCastException: > ReadablePartial objects must have matching field types > [INFO] [client] at > org.joda.time.base.AbstractPartial.compareTo(AbstractPartial.java:325) > [INFO] [client] at > org.joda.time.LocalDate.compareTo(LocalDate.java:566) > [INFO] [client] at > org.joda.time.base.AbstractPartial.isBefore(AbstractPartial.java:381) > > > The problem is that the DateTimeFields are cached using static fields > within DateTimeFieldType. > While Terracotta is able to transfer the DateTime object to the other > JVM, the static fields are different on each of those VMs. > So comparisons using "==" fail.... > > So maybe that could/should be fixed? Do you have an idea how that could > be achieved? > > > Regards, > > Johannes Schneider > > On Wed, 2008-03-26 at 08:41 -0700, Brian S O'Neill wrote: > > It looks like Terracotta is sharing things that aren't intended to be > > shared. The time zone cache is just a performance optimization for the > > local JVM. How can you instruct Terracotta not to share this? I have no > > experience with Terracotta. > > > > The only amount of sharing which was anticipated was serialization of > > the top-level objects, like DateTime. These objects serialize the > > minimum amount of data and no runtime state. Put another way, Joda-Time > > deals with small data objects, and only data is intended to be shared. > > Is Terracotta trying to share the entire Joda-Time runtime? This does > > not make sense. > > > > Johannes Schneider wrote: > > > Hi, > > > > > > I run into big performance problems regarding Joda and Terracotta (a > > > clustering solution). > > > At the moment I don't have any ideas how to solve that. Maybe anybody > > > has any experiences with Joda and Terracotta? > > > > > > I have created a small micro benchmark to test that. It can be found at > > > the Terracotta forums > > > (http://forums.terracotta.org/forums/posts/list/0/903.page#5537). > > > > > > The main problem is that it seems to be necessary to add the following > > > fields as root: > > > > > > <roots> > > > <root> > > > <field-expression>private static final > > > org.joda.time.DateTimeFieldType > > > org.joda.time.DateTimeFieldType.*</field-expression> > > > </root> > > > </roots> > > > > > > If I don't add that root the methods #isAfter() #isBefore #isEquals > > > don't work as expected. > > > > > > And therefore it is necessary to add locking for those methods: > > > > > > <autolock auto-synchronized="true"> > > > <method-expression>* > > > org.joda.time.tz.CachedDateTimeZone.get*(..)</method-expression> > > > <lock-level>write</lock-level> > > > </autolock> > > > <autolock auto-synchronized="true"> > > > <method-expression>* > > > org.joda.time.chrono.BasicChronology.get*(..)</method-expression> > > > <lock-level>write</lock-level> > > > </autolock> > > > > > > > > > But locking those methods on the hole cluster results in a major > > > performance impact when working with Joda objects. > > > > > > If anyone can give me any hint or comment, that will be great. At the > > > moment I am thinking about removing Joda Time completely from the > > > cluster and only do local calculations with Joda. But that means a lot > > > of work and I really don't wanna miss Joda time... > > > > > > > > > > > > Regards, > > > > > > Johannes Schneider > > > > > > > > > ------------------------------------------------------------------------ > > > > > > ------------------------------------------------------------------------- > > > Check out the new SourceForge.net Marketplace. > > > It's the best place to buy or sell services for > > > just about anything Open Source. > > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > > > ------------------------------------------------------------------------ > > > > > > _______________________________________________ > > > Joda-interest mailing list > > > Joda-interest@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/joda-interest > > > > > > > ------------------------------------------------------------------------- > > Check out the new SourceForge.net Marketplace. > > It's the best place to buy or sell services for > > just about anything Open Source. > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > > _______________________________________________ > > Joda-interest mailing list > > Joda-interest@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/joda-interest > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > _______________________________________________ Joda-interest mailing list > Joda-interest@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/joda-interest -- Johannes Schneider Im Lindenwasen 15 72810 Gomaringen Fon +49 7072 9229972 Fax +49 7072 509999 Mobil +49 178 1364488 [EMAIL PROTECTED] http://www.johannes-schneider.info
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