[Mulgara-dev] Mulgara version 2.1.4

[Paul Gearon]

Hi Augustina,

Sorry I haven't replied before now. I've been out all day.

On Thu, Oct 8, 2009 at 10:21 AM, Agustina Martinez <amgcia at gmail.com> wrote:
> Hi Paul,
>
> I've downloaded the new version of Mulgara to test it. I don't know if you
> remembered the problem I was having with 2.1.3 version when trying to use
> Fedora rebuild Index and getting the following exceptions from Mulgara:

Sorry I never followed up with you about this. I'd hoped that Eddie
had been in touch.

Going on your errors below, I originally thought that perhaps it was
exactly what it claimed to be: a connection failure. But I've seen
errors like this before, and that wasn't the cause, so I'm considering
other causes.

You mentioned that you're rebuilding Fedora's indexes. I don't know
what Fedora does in that case, but I'm wondering if you're trying to
access an older version of the storage files using the more recent
database. We don't have automatic forward porting, of these files, so
you'll get an error there.

Again, not knowing how to do things in Fedora, in Mulgara you'd bring
data forward by backing up the database with the old system, and then
restoring it into the new system. The commands for this are:

  backup <rmi://localhost/server1> to <file:/tmp/mydata.gz>
  restore <rmi://localhost/server1> from <file:/tmp/mydata.gz>

Keep on me about this, and I'll track down the people who ought to be
able to help.

Regards,
Paul Gearon

> Error: Error adding triples: org.mulgara.query.QueryException: Java RMI
> failure
>
> org.trippi.TrippiException: Error adding triples:
> org.mulgara.query.QueryException: Java RMI failure
>     at
> org.trippi.impl.mulgara.MulgaraSession.doTriples(MulgaraSession.java:212)
>     at org.trippi.impl.mulgara.MulgaraSession.add(MulgaraSession.java:71)
>     at
> org.trippi.impl.base.MemUpdateBuffer.writeBatch(MemUpdateBuffer.java:199)
>     at org.trippi.impl.base.MemUpdateBuffer.flush(MemUpdateBuffer.java:123)
>     at
> org.trippi.impl.base.ConcurrentTriplestoreWriter.flushBuffer(ConcurrentTriplestoreWriter.java:280)
>     at
> fedora.server.resourceIndex.ResourceIndexImpl.flushBuffer(ResourceIndexImpl.java:439)
>     at
> fedora.server.resourceIndex.ResourceIndexRebuilder.finish(ResourceIndexRebuilder.java:167)
>     at fedora.server.utilities.rebuild.Rebuild.<init>(Rebuild.java:129)
>     at fedora.server.utilities.rebuild.Rebuild.main(Rebuild.java:420)
> Caused by: org.mulgara.query.QueryException: Java RMI failure
>     at
> org.mulgara.server.rmi.RemoteSessionWrapperSession.testRetry(RemoteSessionWrapperSession.java:638)
>     at
> org.mulgara.server.rmi.RemoteSessionWrapperSession.insert(RemoteSessionWrapperSession.java:224)
>     at
> org.trippi.impl.mulgara.MulgaraSession.doTriples(MulgaraSession.java:195)
>     ... 8 more
> Caused by: java.rmi.MarshalException: error marshalling arguments; nested
> exception is:
>     java.net.SocketException: Broken pipe
>     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
>     at org.mulgara.server.rmi.RemoteJRDFSessionImpl_Stub.insert(Unknown
> Source)
>     at
> org.mulgara.server.rmi.RemoteSessionWrapperSession.insert(RemoteSessionWrapperSession.java:221)
>     ... 9 more
> Caused by: java.net.SocketException: Broken pipe
>     at java.net.SocketOutputStream.socketWrite0(Native Method)
>     at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
>     at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
>     at
> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
>     at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
>     at
> java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1685)
>     at
> java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1594)
>     at
> java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1173)
>     at
> java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1127)
>     at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1284)
>     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
>     at
> java.io.ObjectOutputStream.writeFatalException(ObjectOutputStream.java:1398)
>     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:305)
>     at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:258)
>     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:117)
>     ... 11 more
>
> You redirected me to one of your colleagues but I haven't heard from him.
> Any clue on this?
>
> Thanks in advance and best regards!
> Agustina
>
> 2009/10/8 Paul Gearon <gearon at ieee.org>
>>
>> I am pleased to announce Mulgara version 2.1.4.  Mulgara can be downloaded
>> from:
>>  http://mulgara.org/download.html
>>
>> This version now allows users to configure Mulgara to load up any
>> XPathFunctionResolver class and use the functions it provides within
>> SPARQL queries. By default, Mulgara is now including the EXSLT
>> functions, along with several custom functions.
>>
>> Several significant bugfixes have also been included:
>> - XML and JSON results are now correctly encoded with UTF-8.
>> - Graph URIs are no longer canonicalized if they are not in the RMI
>> scheme.
>> - Improved query planning for some queries. Mulgara's queries are
>> still DISTINCT only, so the speed improvements associate with this
>> change will not appear until 2.1.5.
>> - Fixed handling of graphs accessed through HTTPS, particularly on Mac.
>>
>> For the full list of updates, please see the release notes and
>> documentation for details.
>>  Release notes: http://mulgara.org/release.html#v2.1.4
>>  Documentation: http://mulgara.org/trac/wiki/Docs
>>
>> The bug fixes in this release mostly occurred due to your requests.
>> Thanks for the contribution, and I hope that this encourages more
>> feedback. You can get in touch with us on the mailing lists, or submit
>> a report to the bug tracker:
>>  http://mulgara.org/trac/report