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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: lucene index program won't start after power failure
Date Thu, 29 Sep 2016 15:22:17 GMT
No ... I don't think Luke can recreate the segments file.

I dug around and found the thread I was thinking of:
http://markmail.org/thread/ayl5q6rgtngeuoyy

Just be careful!  Make a backup copy of your index first!

Mike McCandless

http://blog.mikemccandless.com


On Thu, Sep 29, 2016 at 11:31 AM, Ziming Dong <dzm1016397507@gmail.com> wrote:
> do you mean `http://www.getopt.org/luke/`?
>
> On Mon, Sep 26, 2016 at 4:58 AM, Michael McCandless
> <lucene@mikemccandless.com> wrote:
>>
>> It is in theory possible to reconstruct a segments file by ls-ing all
>> other index files and manually rebuilding it but it is not an easy
>> task and it would have to make some guesses.
>>
>> I think in the past a user did manage to create such a tool and maybe
>> posted the results here either on this list or the dev list?
>>
>> The segments file is a vital file to the index.  It holds all metadata
>> about the index segments.  This is why Lucene is so careful about
>> writing a new one to a "pending" file, fsync'ing that, fsyncing the
>> directory, and doing an atomic rename, all before removing the older
>> segment files.
>>
>> Mike McCandless
>>
>> http://blog.mikemccandless.com
>>
>>
>> On Sun, Sep 25, 2016 at 10:37 AM, Ziming Dong <dzm1016397507@gmail.com>
>> wrote:
>> > sorry to resend.
>> > I'll change IO to local. Is there anyway to recover first index? now it
>> > can
>> > not be opened by checkIndex, we are building index of 7 billion
>> > webpages, it
>> > costs much time to rebuild.
>> >
>> > On Sun, Sep 25, 2016 at 5:31 PM, Ziming Dong <dzm1016397507@gmail.com>
>> > wrote:
>> >>
>> >> I'll change IO to local. Is there anyway to recover first index? now it
>> >> can be opened by checkIndex, we are building index of 7 billion
>> >> webpages, it
>> >> costs much time to rebuild.
>> >>
>> >> On Sat, Sep 24, 2016 at 2:54 AM, Michael McCandless
>> >> <lucene@mikemccandless.com> wrote:
>> >>>
>> >>> The 'sync' option for an NFS client just means that every write is
>> >>> sent immediately across the network.  And it really is useless
>> >>> performance loss as long as your app (like Lucene) does the "right
>> >>> thing" with fsync.
>> >>>
>> >>> The more important question is why fsync sent to your NFS client and
>> >>> then to the Mac Mini's NFS server failed to actually move all written
>> >>> bytes to durable storage.
>> >>>
>> >>> Can you reproduce this issue if you use a more well trodden IO system,
>> >>> e.g. Linux with ext4 on a local IO device?
>> >>>
>> >>> Mike McCandless
>> >>>
>> >>> http://blog.mikemccandless.com
>> >>>
>> >>> On Fri, Sep 23, 2016 at 12:00 AM, Ziming Dong
>> >>> <dzm1016397507@gmail.com>
>> >>> wrote:
>> >>> > I use the macmini on NFS server side. It seems mount option sync
 is
>> >>> > useless, just slows down the index program.
>> >>> >
>> >>> > On Fri, Sep 23, 2016 at 4:43 AM, Michael McCandless
>> >>> > <lucene@mikemccandless.com> wrote:
>> >>> >>
>> >>> >> OK sorry I meant your first index, and it seems to have only
one
>> >>> >> (broken) segments file.  Can you post the "ls -l" output of
that
>> >>> >> first
>> >>> >> index?  It looks like the file was (illegally) filled with
0s, or
>> >>> >> at
>> >>> >> least the first 4 bytes were.
>> >>> >>
>> >>> >> Lucene writes this file, fsyncs it, does an atomic rename,
and
>> >>> >> fsyncs
>> >>> >> the directory, so this should not happen, if your IO system
honors
>> >>> >> fsync.
>> >>> >>
>> >>> >> What IO devices are used by the NFS server?
>> >>> >>
>> >>> >> NFS is not well tested and has several known problems with
Lucene
>> >>> >> so
>> >>> >> this is already risky ground...
>> >>> >>
>> >>> >> Mike McCandless
>> >>> >>
>> >>> >> http://blog.mikemccandless.com
>> >>> >>
>> >>> >> On Thu, Sep 22, 2016 at 11:33 AM, Ziming Dong
>> >>> >> <dzm1016397507@gmail.com>
>> >>> >> wrote:
>> >>> >> > second index is recovered by checkIndex, I don't know
what are in
>> >>> >> > second
>> >>> >> > index directory before recover.
>> >>> >> > checkIndex can't read first index. index filenames are
attached.
>> >>> >> > I use lucene6.0.0 at the beginning, then I upgrade to
lucene6.1.0
>> >>> >> > to
>> >>> >> > continue index.
>> >>> >> >
>> >>> >> > On Thu, Sep 22, 2016 at 10:17 PM, Michael McCandless
>> >>> >> > <lucene@mikemccandless.com> wrote:
>> >>> >> >>
>> >>> >> >> Do you have 2 separate segments files in that 2nd
index?
>> >>> >> >>
>> >>> >> >> Which exact Lucene version is this?
>> >>> >> >>
>> >>> >> >> Mike McCandless
>> >>> >> >>
>> >>> >> >> http://blog.mikemccandless.com
>> >>> >> >>
>> >>> >> >>
>> >>> >> >> On Thu, Sep 22, 2016 at 7:44 AM, Ziming Dong
>> >>> >> >> <dzm1016397507@gmail.com>
>> >>> >> >> wrote:
>> >>> >> >> > I used checkIndex to recover second index though
I lost many
>> >>> >> >> > docs
>> >>> >> >> > in
>> >>> >> >> > index,
>> >>> >> >> > but first index can't be read by checkIndex,
error is
>> >>> >> >> >
>> >>> >> >> >> java -cp lucene-core-6.1.0.jar -ea:org.apache.lucene...
>> >>> >> >> >> org.apache.lucene.index.CheckIndex
>> >>> >> >> >> /Volumes/HPT8_56T/infomall-index/index0
>> >>> >> >> >> Opening index @ /Volumes/HPT8_56T/infomall-index/index0
>> >>> >> >> >> ERROR: could not read any segments file in
directory
>> >>> >> >> >> org.apache.lucene.index.IndexFormatTooOldException:
Format
>> >>> >> >> >> version
>> >>> >> >> >> is
>> >>> >> >> >> not
>> >>> >> >> >> supported (resource
>> >>> >> >> >>
>> >>> >> >> >>
>> >>> >> >> >>
>> >>> >> >> >>
>> >>> >> >> >> BufferedChecksumIndexInput(MMapIndexInput(path="/Volumes/HPT8_56T/infomall-index/index0/segments_5t3"))):
>> >>> >> >> >> 0 (needs to be between 1071082519 and 1071082519).
This
>> >>> >> >> >> version
>> >>> >> >> >> of
>> >>> >> >> >> Lucene
>> >>> >> >> >> only supports indexes created with release
5.0 and later.
>> >>> >> >> >>         at
>> >>> >> >> >>
>> >>> >> >> >>
>> >>> >> >> >>
>> >>> >> >> >> org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:295)
>> >>> >> >> >>         at
>> >>> >> >> >>
>> >>> >> >> >>
>> >>> >> >> >>
>> >>> >> >> >> org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:284)
>> >>> >> >> >>         at
>> >>> >> >> >>
>> >>> >> >> >>
>> >>> >> >> >> org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:507)
>> >>> >> >> >>         at
>> >>> >> >> >>
>> >>> >> >> >> org.apache.lucene.index.CheckIndex.doCheck(CheckIndex.java:2595)
>> >>> >> >> >>         at
>> >>> >> >> >>
>> >>> >> >> >> org.apache.lucene.index.CheckIndex.doMain(CheckIndex.java:2497)
>> >>> >> >> >>         at
>> >>> >> >> >> org.apache.lucene.index.CheckIndex.main(CheckIndex.java:2423)
>> >>> >> >> >
>> >>> >> >> >
>> >>> >> >> >  I use NFS, but I set mount option as  mount
-t nfs -o
>> >>> >> >> > tcp,sync,retrans=10
>> >>> >> >> > The index program has run 1 month without any
problem before
>> >>> >> >> > power
>> >>> >> >> > failure.
>> >>> >> >> >
>> >>> >> >> > On Thu, Sep 22, 2016 at 6:06 PM, Michael McCandless
>> >>> >> >> > <lucene@mikemccandless.com> wrote:
>> >>> >> >> >>
>> >>> >> >> >> Hmm I'm no longer so sure this is an IW bug:
on commit we
>> >>> >> >> >> fsync
>> >>> >> >> >> the
>> >>> >> >> >> pending_segments_N and then do an atomic
rename to
>> >>> >> >> >> segments_N.
>> >>> >> >> >>
>> >>> >> >> >> Can you describe your IO system?  Is it possible
it does not
>> >>> >> >> >> implement
>> >>> >> >> >> fsync or atomic renames correctly?
>> >>> >> >> >>
>> >>> >> >> >> Also, your 2nd exception indices the segments_N
file was
>> >>> >> >> >> intact
>> >>> >> >> >> but
>> >>> >> >> >> the .cfs file was corrupt, which is also
hard to explain
>> >>> >> >> >> unless
>> >>> >> >> >> fsync
>> >>> >> >> >> isn't working on your IO system.
>> >>> >> >> >>
>> >>> >> >> >> Mike McCandless
>> >>> >> >> >>
>> >>> >> >> >> http://blog.mikemccandless.com
>> >>> >> >> >>
>> >>> >> >> >> On Thu, Sep 22, 2016 at 5:10 AM, Michael
McCandless
>> >>> >> >> >> <lucene@mikemccandless.com> wrote:
>> >>> >> >> >> > Sorry for the slow reply here.  Curious
that both of these
>> >>> >> >> >> > exceptions
>> >>> >> >> >> > are from IW.init.  I think this may
be a real bug, caused
>> >>> >> >> >> > by
>> >>> >> >> >> > this:
>> >>> >> >> >> >
>> >>> >> >> >> >
>> >>> >> >> >> >
>> >>> >> >> >> >
>> >>> >> >> >> >
>> >>> >> >> >> > https://github.com/apache/lucene-solr/commit/981bfba841144d08df1d1a183d39fcd6f195ad56
>> >>> >> >> >> >
>> >>> >> >> >> > I'll see if I can make a standalone
test case showing this.
>> >>> >> >> >> >
>> >>> >> >> >> > If you open those indices with an IndexReader
instead, does
>> >>> >> >> >> > it
>> >>> >> >> >> > succeed?
>> >>> >> >> >> >
>> >>> >> >> >> > If you run CheckIndex, what does it
report?
>> >>> >> >> >> >
>> >>> >> >> >> > Mike McCandless
>> >>> >> >> >> >
>> >>> >> >> >> > http://blog.mikemccandless.com
>> >>> >> >> >> >
>> >>> >> >> >> > On Wed, Sep 14, 2016 at 1:22 AM, Ziming
Dong
>> >>> >> >> >> > <dzm1016397507@gmail.com>
>> >>> >> >> >> > wrote:
>> >>> >> >> >> >> I have 6 machine and 6 index directories,
each machine
>> >>> >> >> >> >> builds
>> >>> >> >> >> >> index
>> >>> >> >> >> >> into
>> >>> >> >> >> >> one index directory. After power
failure last night, two
>> >>> >> >> >> >> of
>> >>> >> >> >> >> those
>> >>> >> >> >> >> machine
>> >>> >> >> >> >> can't start index program.
>> >>> >> >> >> >>
>> >>> >> >> >> >> one error is
>> >>> >> >> >> >>
>> >>> >> >> >> >>> INFO: 2016-09-14 12:31:38 [main]
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.InfomallIndexer$Builder:ignoreCollectionsFile(227):
>> >>> >> >> >> >>> Loaded 2146 ignored collections
from
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> /mnt/HPT8_56T/infomall-index/index0/ignored_collections.txt
>> >>> >> >> >> >>> ERROR: 2016-09-14 12:31:39 [main]
>> >>> >> >> >> >>> sewm.bdbox.util.LogUtil:error(71):
>> >>> >> >> >> >>> org.apache.lucene.index.IndexFormatTooOldException:
>> >>> >> >> >> >>> Format
>> >>> >> >> >> >>> version
>> >>> >> >> >> >>> is
>> >>> >> >> >> >>> not
>> >>> >> >> >> >>> supported (resource
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> BufferedChecksumIndexInput(MMapIndexInput(path="/mnt/HPT8_56T/infomall-index/index0/segments_5t3"))):
>> >>> >> >> >> >>> 0 (needs to be between 1071082519
and 1071082519). This
>> >>> >> >> >> >>> version
>> >>> >> >> >> >>> of
>> >>> >> >> >> >>> Lucene
>> >>> >> >> >> >>> only supports indexes created
with release 5.0 and later.
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:295)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:284)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:910)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.InfomallIndexer.<init>(InfomallIndexer.java:60)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.ThreadedInfomallIndexer.<init>(ThreadedInfomallIndexer.java:28)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.ThreadedInfomallIndexer.<init>(ThreadedInfomallIndexer.java:21)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.ThreadedInfomallIndexer$Builder.build(ThreadedInfomallIndexer.java:72)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.ThreadedInfomallIndexer.main(ThreadedInfomallIndexer.java:129)
>> >>> >> >> >> >>
>> >>> >> >> >> >>
>> >>> >> >> >> >> another is
>> >>> >> >> >> >>
>> >>> >> >> >> >> INFO: 2016-09-14 01:11:06 [main]
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.InfomallIndexer$Builder:ignoreCollectionsFile(227):
>> >>> >> >> >> >>> Loaded 8575 ignored collections
from
>> >>> >> >> >> >>> /mnt/HPT8/infomall-index/index5/ignored_collections.txt
>> >>> >> >> >> >>> ERROR: 2016-09-14 01:11:09 [main]
>> >>> >> >> >> >>> sewm.bdbox.util.LogUtil:error(71):
>> >>> >> >> >> >>> org.apache.lucene.index.CorruptIndexException:
codec
>> >>> >> >> >> >>> footer
>> >>> >> >> >> >>> mismatch
>> >>> >> >> >> >>> (file
>> >>> >> >> >> >>> truncated?): actual footer=0
vs expected
>> >>> >> >> >> >>> footer=-1071082520
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> (resource=MMapIndexInput(path="/mnt/HPT8/infomall-index/index5/_1kqn.cfs"))
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.codecs.CodecUtil.validateFooter(CodecUtil.java:448)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.codecs.CodecUtil.retrieveChecksum(CodecUtil.java:433)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.codecs.lucene50.Lucene50CompoundReader.<init>(Lucene50CompoundReader.java:86)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.codecs.lucene50.Lucene50CompoundFormat.getCompoundReader(Lucene50CompoundFormat.java:71)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.index.IndexWriter.readFieldInfos(IndexWriter.java:1016)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.index.IndexWriter.getFieldNumberMap(IndexWriter.java:1033)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:938)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.InfomallIndexer.<init>(InfomallIndexer.java:60)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.ThreadedInfomallIndexer.<init>(ThreadedInfomallIndexer.java:28)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.ThreadedInfomallIndexer.<init>(ThreadedInfomallIndexer.java:21)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.ThreadedInfomallIndexer$Builder.build(ThreadedInfomallIndexer.java:72)
>> >>> >> >> >> >>>         at
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>>
>> >>> >> >> >> >>> sewm.bdbox.search.ThreadedInfomallIndexer.main(ThreadedInfomallIndexer.java:129)
>> >>> >> >> >> >>>
>> >>> >> >> >> >>
>> >>> >> >> >> >>
>> >>> >> >> >> >> it seems 1071082519 is a special
number.
>> >>> >> >> >> >>
>> >>> >> >> >> >> - -
>> >>> >> >> >> >>
>> >>> >> >> >> >> Ziming Dong
>> >>> >> >> >> >> *http://suiyuan2009.github.io/
>> >>> >> >> >> >> <http://suiyuan2009.github.io/>*
>> >>> >> >> >
>> >>> >> >> >
>> >>> >> >> >
>> >>> >> >> >
>> >>> >> >> > --
>> >>> >> >> >
>> >>> >> >> > Ziming Dong
>> >>> >> >> > http://suiyuan2009.github.io/
>> >>> >> >> >
>> >>> >> >
>> >>> >> >
>> >>> >> >
>> >>> >> >
>> >>> >> > --
>> >>> >> >
>> >>> >> > Ziming Dong
>> >>> >> > http://suiyuan2009.github.io/
>> >>> >> >
>> >>> >
>> >>> >
>> >>> >
>> >>> >
>> >>> > --
>> >>> >
>> >>> > Ziming Dong
>> >>> > http://suiyuan2009.github.io/
>> >>> >
>> >>
>> >>
>> >>
>> >>
>> >> --
>> >>
>> >> Ziming Dong
>> >> http://suiyuan2009.github.io/
>> >>
>> >
>> >
>> >
>> > --
>> >
>> > Ziming Dong
>> > http://suiyuan2009.github.io/
>> >
>
>
>
>
> --
>
> Ziming Dong
> http://suiyuan2009.github.io/
>

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