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From Naama Kraus <naamakr...@gmail.com>
Subject Re: Problems with IndexWriter#commit() on Linux
Date Mon, 08 Feb 2010 10:24:00 GMT
Here is what I get with mount -l
/dev/mapper/lvm--raid-lvm0 on /data3 type ext3 (rw) []

Is there anything else to get more details of the mount options ?

On Mon, Feb 8, 2010 at 10:57 AM, Michael McCandless <
lucene@mikemccandless.com> wrote:

> Thanks for sharing...
>
> Software RAID should be perfectly fine for Lucene, in general, unless
> the mount is configured to ignore fsync (I think the "data=writeback"
> mount option for ext3 does so on Linux).
>
> Can you check the mount options on your RAID filesystem?
>
> Mike
>
> On Mon, Feb 8, 2010 at 2:09 AM, Naama Kraus <naamakraus@gmail.com> wrote:
> > Hi All,
> >
> > I am back to this one after some while.
> > It appears the file system I was using resides on software RAID disks. I
> ran
> > the same code on the same Linux machine, but on another file system
> residing
> > on SCSI disks. I didn't observe the problem there.
> > Both file systems are ext3.
> > So I am guessing the problem relates to the RAID disks.
> >
> > I looked again at commit() API, and the following comment may be
> explaining:
> >
> > "Note that this operation calls Directory.sync on the index files. That
> call
> > should not return until the file contents & metadata are on stable
> storage.
> > For FSDirectory, this calls the OS's fsync. But, beware: some hardware
> > devices may in fact cache writes even during fsync, and return before the
> > bits are actually on stable storage, to give the appearance of faster
> > performance. If you have such a device, and it does not have a battery
> > backup (for example) then on power loss it may still lose data. Lucene
> > cannot guarantee consistency on such devices."
> >
> > Well, for me, running on the SCSI disks is just fine, I wanted to anyway
> > share my experience.
> >
> > Naama
> >
> > On Fri, Jan 8, 2010 at 12:09 AM, Naama Kraus <naamakraus@gmail.com>
> wrote:
> >
> >> Thanks all for the hints, I'll get back to my code and do some
> additional
> >> checks.
> >> Naama
> >>
> >>
> >> On Thu, Jan 7, 2010 at 6:57 PM, Michael McCandless <
> >> lucene@mikemccandless.com> wrote:
> >>
> >>> kill -9 is harsh, but, perfectly fine from Lucene's standpoint.
> >>> Likewise if the OS or JVM crashes, power is suddenly lost, the index
> >>> will just fallback to the last successful commit.  What will cause
> >>> corruption is if you have bit errors happening somewhere in the
> >>> machine... or if two writers are accidentally allowed to be open on
> >>> one index... then you're in trouble.
> >>>
> >>> What IO system (filesystem & hardware) are you using on Linux?
> >>> Boiling down to a smallish test case can help to isolate the
> >>> problem...
> >>>
> >>> Mike
> >>>
> >>> On Thu, Jan 7, 2010 at 11:51 AM, Erick Erickson <
> erickerickson@gmail.com>
> >>> wrote:
> >>> > Can you show us the code where you commit?
> >>> >
> >>> > And how do you kill your process? Kill -9 is...er...harsh....
> >>> >
> >>> > Yeah, I'm wondering whether the index file size *stays*
> >>> > changed after you kill you process. If it keeps its
> >>> > growing on every run (after you kill your process
> >>> > multiple times), then I'd suspect that you aren't
> >>> > adding documents like you think you are. Perhaps
> >>> > different fields, different analyzers, etc.
> >>> >
> >>> > Luke should show you the largest document by ID,
> >>> > as well as document counts. Comparing changes
> >>> > in the document count and the max doc ID should
> >>> > tell you something...
> >>> >
> >>> > Is it possible that you are updating existing docs
> >>> > rather than adding new ones?
> >>> >
> >>> > Best
> >>> > Erick
> >>> >
> >>> > On Thu, Jan 7, 2010 at 10:41 AM, Naama Kraus <naamakraus@gmail.com>
> >>> wrote:
> >>> >
> >>> >> Thanks dor the input.
> >>> >>
> >>> >> 1. While the process is running, I do see the index files growing
on
> >>> disk
> >>> >> and the time stamps changing. Should I see a change in size right
> after
> >>> >> killing the process, is that what you mean ?
> >>> >> 2. Yes, same directory is being used for indexing and search.
> >>> >> 3. Didn't try Luke, good idea. Though I wonder, the same code runs
> well
> >>> on
> >>> >> Windows.
> >>> >>
> >>> >> Naama
> >>> >>
> >>> >> On Thu, Jan 7, 2010 at 3:37 PM, Erick Erickson <
> >>> erickerickson@gmail.com
> >>> >> >wrote:
> >>> >>
> >>> >> > Several questions:
> >>> >> > 1> are the index files larger after you kill your process?
> >>> >> >    Or have the timestamps changed?
> >>> >> > 2> are you absolutely sure that your indexer, when you
> >>> >> >     add documents, is pointing at the same directory your
> >>> >> >     search is pointing to?
> >>> >> > 3> Have you gotten a copy of Luke and examined your index
> >>> >> >     to see if, perhaps, your documents aren't being added
the
> >>> >> >     way you think they are?
> >>> >> >
> >>> >> > Erick
> >>> >> >
> >>> >> > On Thu, Jan 7, 2010 at 7:13 AM, Naama Kraus <naamakraus@gmail.com
> >
> >>> >> wrote:
> >>> >> >
> >>> >> > > Hi,
> >>> >> > >
> >>> >> > > I am using IndexWriter#commit() methods in my program
to commit
> >>> >> document
> >>> >> > > additions to the index. I do that once in a while, after
a bunch
> of
> >>> >> > > documents were added. Since my indexing process is long,
I want
> to
> >>> make
> >>> >> > > sure
> >>> >> > > I don't loose too many additions in case of a crash.
> >>> >> > > When running on Windows, things work as expected. But
when
> running
> >>> my
> >>> >> > code
> >>> >> > > on Linux, seems like commit() has no effect. If I kill
my
> program
> >>> and
> >>> >> > then
> >>> >> > > restart it, I don't see documents that I added and then
> committed
> >>> (they
> >>> >> > are
> >>> >> > > not returned by a search operation).
> >>> >> > > I am running Lucene 3.0.0
> >>> >> > >
> >>> >> > > Can anyone help ?
> >>> >> > >
> >>> >> > > Thanks, Naama
> >>> >> > >
> >>> >> > > --
> >>> >> > > "If you want your children to be intelligent, read them
fairy
> >>> tales. If
> >>> >> > you
> >>> >> > > want them to be more intelligent, read them more fairy
tales."
> >>> >> > > "What really interests me is whether God had any choice
in the
> >>> creation
> >>> >> > of
> >>> >> > > the world."
> >>> >> > > (Albert Einstein)
> >>> >> > >
> >>> >> >
> >>> >>
> >>> >>
> >>> >>
> >>> >> --
> >>> >> "If you want your children to be intelligent, read them fairy tales.
> If
> >>> you
> >>> >> want them to be more intelligent, read them more fairy tales."
> >>> >> "What really interests me is whether God had any choice in the
> creation
> >>> of
> >>> >> the world."
> >>> >> (Albert Einstein)
> >>> >>
> >>> >
> >>>
> >>> ---------------------------------------------------------------------
> >>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> >>> For additional commands, e-mail: java-user-help@lucene.apache.org
> >>>
> >>>
> >>
> >>
> >> --
> >> "If you want your children to be intelligent, read them fairy tales. If
> you
> >> want them to be more intelligent, read them more fairy tales."
> >> "What really interests me is whether God had any choice in the creation
> of
> >> the world."
> >> (Albert Einstein)
> >>
> >
> >
> >
> > --
> > "If you want your children to be intelligent, read them fairy tales. If
> you
> > want them to be more intelligent, read them more fairy tales."
> > "What really interests me is whether God had any choice in the creation
> of
> > the world."
> > "A table, a chair, a bowl of fruit and a violin; what else does a man
> need
> > to be happy? "
> > (Albert Einstein)
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>


-- 
"If you want your children to be intelligent, read them fairy tales. If you
want them to be more intelligent, read them more fairy tales."
"What really interests me is whether God had any choice in the creation of
the world."
"A table, a chair, a bowl of fruit and a violin; what else does a man need
to be happy? "
(Albert Einstein)

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