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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: unsafe memory access operation
Date Fri, 12 Dec 2014 21:28:20 GMT
Hi,


> Ume, Thank you for your inputs. We update (write) index nightly once a day
> and use it majorly for reads.
> 
> I am wondering how does the latest version of java that you recommend
> help in my case. Please clarify.

This is unrelated to this issue. It is just a recommendation.

> --
> on a side note,not related to this, could you please reply to my comments on
> your blog for MMap directory post.

What was your question?

Uwe

> On Fri, Dec 12, 2014 at 12:59 PM, Uwe Schindler <uwe@thetaphi.de> wrote:
> >
> > Hi,
> >
> > I noticed, you mentioned "NFS" as filesystem. Lucene does not work
> > correctly on NFS as file systems, especially when writing to an index
> > (commits don’t work safely, NRT reopening breaks without correct
> > DeletionPolicy, FileLocking is broken). Purely reading indexes is
> > fine, but here NFS is a problem with MMap, because whenever the
> > connection to the NFS server drops, it may crush the whole JVM or
> > produce strange errors. This could also be the reason for the error you see
> here.
> >
> > I would recommend to update to 1.7.0_72 or 1.8.0_25.
> >
> > Uwe
> >
> > -----
> > Uwe Schindler
> > H.-H.-Meier-Allee 63, D-28213 Bremen
> > http://www.thetaphi.de
> > eMail: uwe@thetaphi.de
> >
> >
> > > -----Original Message-----
> > > From: Vijay B [mailto:vijay.nipuna@gmail.com]
> > > Sent: Friday, December 12, 2014 6:53 PM
> > > To: java-user@lucene.apache.org
> > > Subject: Re: unsafe memory access operation
> > >
> > > Uwe,
> > >
> > > We never seen these errors before with the same version of java.
> > > Would you think updating to latest version of 1.7 would get rid of this?
> > >
> > > Here is the info you requested:
> > >
> > > java version "1.7.0_25"
> > > Java(TM) SE Runtime Environment (build 1.7.0_25-b15) Java
> > > HotSpot(TM) 64- Bit Server VM (build 23.25-b01, mixed mode)
> > >
> > > On Fri, Dec 12, 2014 at 12:51 PM, Vijay B <vijay.nipuna@gmail.com>
> > wrote:
> > > >
> > > > Here is the info you requested:
> > > >
> > > > java version "1.7.0_25"
> > > > Java(TM) SE Runtime Environment (build 1.7.0_25-b15) Java
> > > > HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)
> > > >
> > > >
> > > >
> > > > On Fri, Dec 12, 2014 at 12:05 PM, Uwe Schindler <uwe@thetaphi.de>
> > > wrote:
> > > >>
> > > >> Hi,
> > > >>
> > > >> Which Java 7 build number / update level are you using? Those
> > > >> errors occur easily if you use an outdated JDK version.
> > > >>
> > > >> Uwe
> > > >>
> > > >> -----
> > > >> Uwe Schindler
> > > >> H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de
> > > >> eMail: uwe@thetaphi.de
> > > >>
> > > >> > -----Original Message-----
> > > >> > From: Vijay B [mailto:vijay.nipuna@gmail.com]
> > > >> > Sent: Friday, December 12, 2014 5:31 PM
> > > >> > To: java-user@lucene.apache.org
> > > >> > Subject: unsafe memory access operation
> > > >> >
> > > >> > we are running into this issue for the first time while
> > > >> > searching a
> > > >> lucene index
> > > >> > hosted on NFS. Once, this error occurs, all subsequent requests
> > fails.
> > > >> help
> > > >> > appreciated.
> > > >> >
> > > >> > Our Config:
> > > >> >  64-bit Java 1.7  (we are making use of MMapDirectory)  Lucene
> > > >> > 4.2.1
> > > >> Index
> > > >> > size: 8GB
> > > >> >
> > > >> > Let me know if you need any futher info.
> > > >> >
> > > >> >
> > > >> > java.lang.InternalError: a fault occurred in a recent unsafe
> > > >> > memory
> > > >> access
> > > >> > operation in compiled Java code
> > > >> >
> > >
> org.apache.lucene.codecs.BlockTreeTermsReader$FieldReader$SegmentTe
> > > >> > r
> > > >> > msEnum$Frame.loadBlock(BlockTreeTermsReader.java:2373)
> > > >> >
> > >
> org.apache.lucene.codecs.BlockTreeTermsReader$FieldReader$SegmentTe
> > > >> > r
> > > >> > msEnum.seekExact(BlockTreeTermsReader.java:1693)
> > > >> > org.apache.lucene.index.TermContext.build(TermContext.java:95)
> > > >> >
> > >
> org.apache.lucene.search.TermQuery.createWeight(TermQuery.java:167)
> > > >> >
> > > org.apache.lucene.search.BooleanQuery$BooleanWeight.&lt;init&gt;(Bo
> > > >> > olea
> > > >> > nQuery.java:187)
> > > >> >
> > >
> org.apache.lucene.search.BooleanQuery.createWeight(BooleanQuery.jav
> > > >> > a:4
> > > >> > 01)
> > > >> >
> > > org.apache.lucene.search.IndexSearcher.createNormalizedWeight(Index
> > > >> > Sea
> > > >> > rcher.java:664)
> > > >> > org.apache.lucene.search.IndexSearcher.search(IndexSearcher.jav
> > > >> > a:30
> > > >> > 9)
> > > >>
> > > >>
> > > >> -----------------------------------------------------------------
> > > >> ---- To unsubscribe, e-mail:
> > > >> java-user-unsubscribe@lucene.apache.org
> > > >> For additional commands, e-mail: java-user-help@lucene.apache.org
> > > >>
> > > >>
> >
> >
> > ---------------------------------------------------------------------
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> >
> >


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