Re: [Bigdata-developers] Current Revision of Blazegraph: Journal consumes extremely much disk space

[Bryan T. <br...@sy...>]

Andreas,

I was not able to replicate your result.  Unfortunately I navigated away
from the browser page in which I had submitted the request, so it loaded
all the data but failed to commit.  However, the resulting file is only
16GB.

I will redo this run and verify that the journal after the commit has this
same size on the disk.

I was only assuming that this was related to group commit because of your
original message.  Perhaps I misinterpreted your message. This is simply
about 1.5.1 (with group commit) vs 1.4.0.

Perhaps the issue is related to the small slot optimization?  Maybe in
combination with group commit?

*> com.bigdata.rwstore.RWStore.smallSlotType=1024*

I could not replicate your properties exactly because you are using a
non-standard vocabulary class.  Therefore I simply deleted the default
namespace (in quads mode) and recreated it with the defaults in triples
mode.  The small slot optimization and other parameters were not enabled in
my run.

Perhaps you could try to replicate my experience and I will enable the
small slots optimization?

Thanks,
Bryan

----
Bryan Thompson
Chief Scientist & Founder
SYSTAP, LLC
4501 Tower Road
Greensboro, NC 27410
br...@sy...
http://blazegraph.com
http://blog.bigdata.com <http://bigdata.com>
http://mapgraph.io

Blazegraph™ <http://www.blazegraph.com/> is our ultra high-performance
graph database that supports both RDF/SPARQL and Tinkerpop/Blueprints
APIs.  MapGraph™ <http://www.systap.com/mapgraph> is our disruptive new
technology to use GPUs to accelerate data-parallel graph analytics.

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On Thu, Apr 23, 2015 at 1:51 AM, Andreas Kahl <ka...@bs...> wrote:

> Bryan & Martyn,
>
> Thank you very much for investigating the issue. I assume  from the ticket
> that the error will vanish if I disable groupCommit. I will do so for the
> meantime.
>
> Although there is already extensive information in Bryan's ticket, please
> find attached my logs and DumpJournal outputs:
> - dumpJournal.html contains a dump from the 67GB journal after Blazegraph
> ran into "No space left on device"
> - dumpJournalWithTraceEnabled.html is the same dump for a running query
> when the journal was at about 14GB
> - queryStatus.html is just the status page showing my query
> - catalina.out.gz contains the trace outputs from starting Tomcat until I
> killed the curl running the SPARQL Update by Ctrl-C
> - loadGnd.log.gz is Blazegraphs output when loading the data
>
> Best Regards
> Andreas
>
>
>
> >>> Bryan Thompson <br...@sy...> 22.04.15 20.56 Uhr >>>
> See http://trac.bigdata.com/ticket/1206.  This is still in the
> investigation stage.
>
> Thanks,
> Bryan
>
> ----
> Bryan Thompson
> Chief Scientist & Founder
> SYSTAP, LLC
> 4501 Tower Road
> Greensboro, NC 27410
> br...@sy...
> http://blazegraph.com
> http://blog.bigdata.com <http://bigdata.com>
> http://mapgraph.io
>
> Blazegraph™ <http://www.blazegraph.com/> is our ultra high-performance
> graph database that supports both RDF/SPARQL and Tinkerpop/Blueprints
> APIs.  MapGraph™ <http://www.systap.com/mapgraph> is our disruptive new
> technology to use GPUs to accelerate data-parallel graph analytics.
>
> CONFIDENTIALITY NOTICE:  This email and its contents and attachments are
> for the sole use of the intended recipient(s) and are confidential or
> proprietary to SYSTAP. Any unauthorized review, use, disclosure,
> dissemination or copying of this email or its contents or attachments is
> prohibited. If you have received this communication in error, please notify
> the sender by reply email and permanently delete all copies of the email
> and its contents and attachments.
>
> On Wed, Apr 22, 2015 at 5:37 AM, Andreas Kahl <ka...@bs...>
> wrote:
>
> > Hello everyone,
> >
> > I currently updated to the current Revision (f4c63e5) of Blazegraph from
> > Git and tried to load a dataset into the updated Webapp. With Bigdata
> 1.4.0
> > this resulted in a journal of ~18GB. Now the process was cancelled
> because
> > the disk was full - the journal was beyond 50GB for the same file with
> the
> > same settings.
> > The only exception was that I activated GroupCommit.
> >
> > The dataset can be downloaded here:
> >
> http://datendienst.dnb.de/cgi-bin/mabit.pl?cmd=fetch&userID=opendata&pass=opendata&mabheft=GND.rdf.gz
> > .
> > Please find the settings used to load the file below.
> >
> > Do I have a misconfiguration, or is there a bug eating all disk memory?
> >
> > Best regards
> > Andreas
> >
> > Namespace-Properties:
> > curl -H "Accept: text/plain"
> > http://localhost:8080/bigdata/namespace/gnd/properties
> > #Wed Apr 22 11:35:31 CEST 2015
> > com.bigdata.namespace.kb.spo.com.bigdata.btree.BTree.branchingFactor=700
> > com.bigdata.relation.container=gnd
> > com.bigdata.rwstore.RWStore.smallSlotType=1024
> > com.bigdata.journal.AbstractJournal.bufferMode=DiskRW
> > com.bigdata.journal.AbstractJournal.file=/var/lib/bigdata/bigdata.jnl
> >
> >
> com.bigdata.rdf.store.AbstractTripleStore.vocabularyClass=de.bsb_muenchen.bigdata.vocab.B3KatVocabulary
> > com.bigdata.journal.AbstractJournal.initialExtent=209715200
> > com.bigdata.rdf.store.AbstractTripleStore.textIndex=true
> > com.bigdata.btree.BTree.branchingFactor=700
> >
> >
> com.bigdata.rdf.store.AbstractTripleStore.axiomsClass=com.bigdata.rdf.axioms.NoAxioms
> > com.bigdata.rdf.sail.isolatableIndices=false
> > com.bigdata.service.AbstractTransactionService.minReleaseAge=1
> > com.bigdata.rdf.sail.bufferCapacity=2000
> > com.bigdata.rdf.sail.truthMaintenance=false
> > com.bigdata.rdf.sail.namespace=gnd
> > com.bigdata.relation.class=com.bigdata.rdf.store.LocalTripleStore
> > com.bigdata.rdf.store.AbstractTripleStore.quads=false
> > com.bigdata.journal.AbstractJournal.writeCacheBufferCount=500
> > com.bigdata.search.FullTextIndex.fieldsEnabled=false
> > com.bigdata.relation.namespace=gndity=10000
> > com.bigdata.rdf.sail.BigdataSail.bufferCapacity=2000
> > com.bigdata.rdf.store.AbstractTripleStore.statementIdentifiers=false
> >
> >
> >
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