Thanks for your support! We do a gracefully shutdown of our application but we do not wait for SaveSnapshotSuccess so this might be the issue.
Regards Wolfgnag Am Freitag, 16. Mai 2014 12:28:47 UTC+2 schrieb Björn Antonsson: > > Hi Martin, > > Thanks for clearing that up. > > Another solution could be to write a special end marker to the snapshot > file and only try to deserialize if the marker is there. > > I've opened a ticket <https://github.com/akka/akka/issues/15212> to make > the local file snapshot store more robust. > > B/ > > On 16 May 2014 at 12:13:01, Martin Krasser > ([email protected]<javascript:>) > wrote: > > The local snapshot store writes snapshots asynchronously and there's no > graceful shutdown implemented (i.e. it doesn't wait for the snapshot being > written successfully). This is currently a responsibility of the > application, waiting for a SaveSnapshotSuccess message to arrive before > stopping the actor. > > As a consequence, there's either an empty or partially written snapshot > file on disk. In this case, the lcoal snapshot store fails to load the > snapshot (logging the causing exception) *but* it will try to load a > next-older snapshot (down to a recursion level of three). If all three > attempts fail, then the corresponding processor is recovered from scratch, > otherwise from one of the older snapshots. If a new snapshot is saved > later, after recovery, everything should be fine again. > > Maybe the best solution to this problem is to write the snapshot to a > temporary file and then make an atomic rename (if supported by the > underlying FS) so that partially written snapshot files are not possible. > Please not that this is specific to the local snapshot store. The Cassandra > snapshot plugin (and maybe also others), for example, does atomic writes ... > > Cheers, > Martin > > On 16.05.14 11:43, Björn Antonsson wrote: > > Hi Wolfgang, > > I guess you are using the local file system store, and the problem only > occurs if the last snapshot file is empty? > > That does indeed sound like a real issue. Would you mind opening a > ticket<https://github.com/akka/akka/issues> and > add this information (with a longer more complete stack trace). > > B/ > > On 16 May 2014 at 10:17:23, Wofr ([email protected] <javascript:>) > wrote: > > Hi > > We using Akka 2.3.2 with akka-persistence in our project. > So far our experience with this new module are quite good :) > . > But recently we run into some troubles when using snapshots. In the case > we shutdown our application we write some data > to some snapshots. Some how it happens sometimes that snapshot files are > created but empty. > > In the case of a restart of our application this empty snapshots causes > this error. > If more revision of this snapshot are available and the last one does > contain data, the error does not occur. > > java.io.EOFException: null > at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown > Source) ~[na:1.7.0_25] > at > java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source) > ~[na:1.7.0_25] > at java.io.ObjectInputStream.readStreamHeader(Unknown Source) > ~[na:1.7.0_25] > at java.io.ObjectInputStream.<init>(Unknown Source) ~[na:1.7.0_25] > at > akka.util.ClassLoaderObjectInputStream.<init>(ClassLoaderObjectInputStream.scala:16) > > ~[akka-actor_2.10-2.3.2.jar:na] > > I would expect that an empty file should not cause an exception. > > Regards > > Wolfgang > > > -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to the Google Groups > "Akka User List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To post to this group, send email to [email protected]<javascript:> > . > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > > -- > *Björn Antonsson* > Typesafe <http://typesafe.com/> – Reactive <http://reactivemanifesto.org/> > Apps > on the JVM > twitter: @bantonsson <http://twitter.com/#%21/bantonsson> > > JOIN US. REGISTER TODAY! <http://www.scaladays.org/> > Scala <http://www.scaladays.org/> > Days <http://www.scaladays.org/> > June 16th-18th, <http://www.scaladays.org/> > Berlin <http://www.scaladays.org/> > > -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to the Google Groups > "Akka User List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To post to this group, send email to [email protected]<javascript:> > . > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > > > -- > Martin Krasser > > blog: http://krasserm.blogspot.com > code: http://github.com/krasserm > twitter: http://twitter.com/mrt1nz > > -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to the Google Groups > "Akka User List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To post to this group, send email to [email protected]<javascript:> > . > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > > -- > *Björn Antonsson* > Typesafe <http://typesafe.com/> – Reactive <http://reactivemanifesto.org/> > Apps > on the JVM > twitter: @bantonsson <http://twitter.com/#!/bantonsson> > > JOIN US. REGISTER TODAY! <http://www.scaladays.org/> > Scala <http://www.scaladays.org/> > Days <http://www.scaladays.org/> > June 16th-18th, <http://www.scaladays.org/> > Berlin <http://www.scaladays.org/> > > -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.
