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From Lance Norskog <goks...@gmail.com>
Subject Re: MMapDirectory failed to map a 23G compound index segment
Date Fri, 09 Sep 2011 03:58:00 GMT
Do you need to use the compound format?

On Thu, Sep 8, 2011 at 3:57 PM, Rich Cariens <richcariens@gmail.com> wrote:

> I should add some more context:
>
>   1. the problem index included several cfs segment files that were around
>   4.7G, and
>   2. I'm running four SOLR instances on the same box, all of which have
>   similiar problem indeces.
>
> A colleague thought perhaps I was bumping up against my 256,000 open files
> ulimit. Do the MultiMMapIndexInput ByteBuffer arrays each consume a file
> handle/descriptor?
>
> On Thu, Sep 8, 2011 at 5:19 PM, Rich Cariens <richcariens@gmail.com>
> wrote:
>
> > FWiW I optimized the index down to a single segment and now I have no
> > trouble opening an MMapDirectory on that index, even though the 23G cfx
> > segment file remains.
> >
> >
> > On Thu, Sep 8, 2011 at 4:27 PM, Rich Cariens <richcariens@gmail.com
> >wrote:
> >
> >> Thanks for the response. "free -g" reports:
> >>
> >>         total        used        free        shared        buffers
> >> cached
> >> Mem:      141          95          46             0
> >> 0            93
> >> -/+ buffers/cache:      2         139
> >> Swap:       3           0           3
> >>
> >> 2011/9/7 Fran├žois Schiettecatte <fschiettecatte@gmail.com>
> >>
> >>> My memory of this is a little rusty but isn't mmap also limited by mem
> +
> >>> swap on the box? What does 'free -g' report?
> >>>
> >>> Fran├žois
> >>>
> >>> On Sep 7, 2011, at 12:25 PM, Rich Cariens wrote:
> >>>
> >>> > Ahoy ahoy!
> >>> >
> >>> > I've run into the dreaded OOM error with MMapDirectory on a 23G cfs
> >>> compound
> >>> > index segment file. The stack trace looks pretty much like every
> other
> >>> trace
> >>> > I've found when searching for OOM & "map failed"[1]. My configuration
> >>> > follows:
> >>> >
> >>> > Solr 1.4.1/Lucene 2.9.3 (plus
> >>> > SOLR-1969<https://issues.apache.org/jira/browse/SOLR-1969>
> >>> > )
> >>> > CentOS 4.9 (Final)
> >>> > Linux 2.6.9-100.ELsmp x86_64 yada yada yada
> >>> > Java SE (build 1.6.0_21-b06)
> >>> > Hotspot 64-bit Server VM (build 17.0-b16, mixed mode)
> >>> > ulimits:
> >>> >    core file size     (blocks, -c)     0
> >>> >    data seg size    (kbytes, -d)     unlimited
> >>> >    file size     (blocks, -f)     unlimited
> >>> >    pending signals    (-i)     1024
> >>> >    max locked memory     (kbytes, -l)     32
> >>> >    max memory size     (kbytes, -m)     unlimited
> >>> >    open files    (-n)     256000
> >>> >    pipe size     (512 bytes, -p)     8
> >>> >    POSIX message queues     (bytes, -q)     819200
> >>> >    stack size    (kbytes, -s)     10240
> >>> >    cpu time    (seconds, -t)     unlimited
> >>> >    max user processes     (-u)     1064959
> >>> >    virtual memory    (kbytes, -v)     unlimited
> >>> >    file locks    (-x)     unlimited
> >>> >
> >>> > Any suggestions?
> >>> >
> >>> > Thanks in advance,
> >>> > Rich
> >>> >
> >>> > [1]
> >>> > ...
> >>> > java.io.IOException: Map failed
> >>> > at sun.nio.ch.FileChannelImpl.map(Unknown Source)
> >>> > at
> org.apache.lucene.store.MMapDirectory$MMapIndexInput.<init>(Unknown
> >>> > Source)
> >>> > at
> org.apache.lucene.store.MMapDirectory$MMapIndexInput.<init>(Unknown
> >>> > Source)
> >>> > at org.apache.lucene.store.MMapDirectory.openInput(Unknown Source)
> >>> > at org.apache.lucene.index.SegmentReader$CoreReaders.<init>(Unknown
> >>> Source)
> >>> >
> >>> > at org.apache.lucene.index.SegmentReader.get(Unknown Source)
> >>> > at org.apache.lucene.index.SegmentReader.get(Unknown Source)
> >>> > at org.apache.lucene.index.DirectoryReader.<init>(Unknown Source)
> >>> > at org.apache.lucene.index.ReadOnlyDirectoryReader.<init>(Unknown
> >>> Source)
> >>> > at org.apache.lucene.index.DirectoryReader$1.doBody(Unknown Source)
> >>> > at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(Unknown
> >>> > Source)
> >>> > at org.apache.lucene.index.DirectoryReader.open(Unknown Source)
> >>> > at org.apache.lucene.index.IndexReader.open(Unknown Source)
> >>> > ...
> >>> > Caused by: java.lang.OutOfMemoryError: Map failed
> >>> > at sun.nio.ch.FileChannelImpl.map0(Native Method)
> >>> > ...
> >>>
> >>>
> >>
> >
>



-- 
Lance Norskog
goksron@gmail.com

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