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From Tim Bogaert <boggu...@gmail.com>
Subject Re: lots of .cfs (compound files) in the index directory
Date Thu, 15 Mar 2012 15:14:20 GMT
Operating system is Solaris. Directory is a NAS.
Directory implementation is SimpleFSDirectory.
I sent you the full log.

Thanks,
Tim

On Thu, Mar 15, 2012 at 4:04 PM, Michael McCandless <
lucene@mikemccandless.com> wrote:

> Hmm, which OS/filesystem is the index on?  Which Directory impl are
> you using...?
>
> Indeed CheckIndex sees the 5111 segments, so something seems amiss.
>
> The log was edited right?  EG I can't see the IW open log entries...
> and IW 51 is missing (it goes straight from 50 to 52).  Can you post
> the full log?  Also, can you attach it (instead of inlining it), maybe
> gzip'd, so it doesn't get line-wrapped?
>
> Finally, can you run things a big longer, so we can see the
> pathological behavior emerge?
>
> The only odd thing I see in the log is that IW seems to be attempting
> to delete files (eg _1a.cfs) that are still "live", which is odd.
>
> That the delete did not succeed could just be that the file is open
> from a reader (do you have a reader open on the index?)... though, I
> would have expected to see "unable to remove file..." in the
> InfoStream output.
>
> Mike McCandless
>
> http://blog.mikemccandless.com
>
>
> On Thu, Mar 15, 2012 at 10:30 AM, Tim Bogaert <bogguard@gmail.com> wrote:
> > Hi Mike,
> >
> > Segment format: FORMAT_3_1 [Lucene 3.1+]
> > NumBadSegments: 0
> > NumSegments: 5111
> > Clean?: true
> > TotLoseDocCount: 0
> > Partial: false
> >
> >
> > I reindexed and let the feed come in again...The logs of the result are
> > below (I just copied a few) after 10 minutes :
> > Segment format: FORMAT_3_1 [Lucene 3.1+]
> > NumBadSegments: 0
> > NumSegments: 11
> > Clean?: true
> > TotLoseDocCount: 0
> > Partial: false
> >
> > What I noticed in the log was that _1a.cfs is getting deleted, but it
> seems
> > to be still in the directory :
> >
> > ls -al
> > -rw-r--r--   1 web      web      1444172 Mar 15 15:13 _17.fdt
> > -rw-r--r--   1 web      web        88804 Mar 15 15:13 _17.fdx
> > -rw-r--r--   1 web      web          142 Mar 15 15:13 _17.fnm
> > -rw-r--r--   1 web      web      4352933 Mar 15 15:13 _17.frq
> > -rw-r--r--   1 web      web       177604 Mar 15 15:13 _17.nrm
> > -rw-r--r--   1 web      web      5931105 Mar 15 15:13 _17.prx
> > -rw-r--r--   1 web      web        18159 Mar 15 15:13 _17.tii
> > -rw-r--r--   1 web      web      1421338 Mar 15 15:13 _17.tis
> > -rw-r--r--   1 web      web           36 Mar 15 15:14 _17_1.del
> > -rw-r--r--   1 web      web       379400 Mar 15 15:13 _18.cfs
> > -rw-r--r--   1 web      web       424376 Mar 15 15:13 _19.cfs
> > -rw-r--r--   1 web      web       463177 Mar 15 15:13 _1a.cfs
> > -rw-r--r--   1 web      web       108875 Mar 15 15:13 _1b.cfs
> > -rw-r--r--   1 web      web         4481 Mar 15 15:14 _1c.cfs
> > -rw-r--r--   1 web      web         4465 Mar 15 15:15 _1d.cfs
> > -rw-r--r--   1 web      web         4534 Mar 15 15:17 _1e.cfs
> > -rw-r--r--   1 web      web         3252 Mar 15 15:18 _1f.cfs
> > -rw-r--r--   1 web      web         3314 Mar 15 15:21 _1g.cfs
> > -rw-r--r--   1 web      web         2340 Mar 15 15:25 _1h.cfs
> > -rw-r--r--   1 web      web         3902 Mar 15 15:27 _1i.cfs
> > -rw-r--r--   1 web      web         1687 Mar 15 15:28 _1j.cfs
> > -rw-r--r--   1 web      web           20 Mar 15 15:28 segments.gen
> > -rw-r--r--   1 web      web         2735 Mar 15 15:28 segments_1h
> >
> >
> > Here is (part of) the log :
> >
> > 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: TMP:
> > seg=_h(3.5):c1 size=0.007 MB [merging] [floored]
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: TMP:
> > seg=_b(3.5):c1 size=0.007 MB [merging] [floored]
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: TMP:
> > seg=_g(3.5):c1 size=0.006 MB [merging] [floored]
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: TMP:
> > seg=_c(3.5):c1 size=0.006 MB [merging] [floored]
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: TMP:
> > seg=_11(3.5):c1 size=0.005 MB [merging] [floored]
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: TMP:
> > seg=_12(3.5):c1 size=0.005 MB [merging] [floored]
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: TMP:
> > seg=_6(3.5):c1 size=0.005 MB [merging] [floored]
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: TMP:
> > allowedSegmentCount=1 vs count=15 (eligible count=5) tooBigCount=0
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: merge time
> 46
> > msec for 10 docs
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: now flush at close
> > waitForMerges=true
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: CMS:
> merge
> > thread: done
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: now trigger flush
> > reason=explicit flush
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #2]: CMS: set
> > priority of merge thread Lucene Merge Thread #3 to 6
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]:   start flush:
> > applyAllDeletes=true
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]:   index before
> flush
> > _0(3.5):C73 _1(3.5):C70 _2(3.5):C23 _3(3.5):c7 _16(3.5):c10 _6(3.5):c1
> > _18(3.5):c10 _17(3.5):c10 _b(3.5):c1 _c(3.5):c1 _d(3.5):c1 _g(3.5):c1
> > _h(3.5):c1 _11(3.5):c1 _12(3.5):c1
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: DW: flush: no
> docs;
> > skipping
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: apply all deletes
> > during flush
> > BD 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: applyDeletes: no
> > deletes; skipping
> > BD 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: prune
> > sis=org.apache.lucene.index.SegmentInfos@1cad1e6 minGen=0 packetCount=0
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: clearFlushPending
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: CMS: now merge
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: CMS:   index:
> > _0(3.5):C73 _1(3.5):C70 _2(3.5):C23 _3(3.5):c7 _16(3.5):c10 _6(3.5):c1
> > _18(3.5):c10 _17(3.5):c10 _b(3.5):c1 _c(3.5):c1 _d(3.5):c1 _g(3.5):c1
> > _h(3.5):c1 _11(3.5):c1 _12(3.5):c1
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: CMS:   no more
> > merges pending; now return
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: waitForMerges
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #3]: merge store
> > matchedCount=10 vs 10
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #3]: merged
> > segment size=0.076 MB vs estimate=0.103 MB
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #3]:
> commitMerge:
> > _2(3.5):C23 _3(3.5):c7 _d(3.5):c1 _h(3.5):c1 _b(3.5):c1 _g(3.5):c1
> > _c(3.5):c1 _11(3.5):c1 _12(3.5):c1 _6(3.5):c1 into _19 index=_0(3.5):C73
> > _1(3.5):C70 _2(3.5):C23 _3(3.5):c7 _16(3.5):c10 _6(3.5):c1 _18(3.5):c10
> > _17(3.5):c10 _b(3.5):c1 _c(3.5):c1 _d(3.5):c1 _g(3.5):c1 _h(3.5):c1
> > _11(3.5):c1 _12(3.5):c1
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #3]:
> > commitMergeDeletes _2(3.5):C23 _3(3.5):c7 _d(3.5):c1 _h(3.5):c1
> _b(3.5):c1
> > _g(3.5):c1 _c(3.5):c1 _11(3.5):c1 _12(3.5):c1 _6(3.5):c1 into _19
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #3]: after
> commit:
> > _0(3.5):C73 _1(3.5):C70 _19(3.5):C38 _16(3.5):c10 _18(3.5):c10
> _17(3.5):c10
> > IFD [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #3]: now
> checkpoint
> > "segments_15" [6 segments ; isCommit = false]
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #3]: merge time
> 61
> > msec for 38 docs
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: waitForMerges done
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; Lucene Merge Thread #3]: CMS:
> merge
> > thread: done
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: now call final
> > commit()
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: commit: start
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: commit: enter lock
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: commit: already
> > prepared
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: commit:
> > pendingCommit != null
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: commit: wrote
> > segments file "segments_16"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: now checkpoint
> > "segments_16" [42 segments ; isCommit = true]
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: deleteCommits: now
> > decRef commit "segments_15"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "segments_15"
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: commit: done
> > IW 50 [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: at close:
> > _0(3.5):C73 _1(3.5):C70 _19(3.5):C38 _16(3.5):c10 _18(3.5):c10
> _17(3.5):c10
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_19.tii"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_19.tis"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_18.cfs"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_19.nrm"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_19.fnm"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_19.fdt"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_17.cfs"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_19.prx"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_16.cfs"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_19.fdx"
> > IFD [Thu Mar 15 15:25:23 MET 2012; pool-2-thread-1]: delete "_19.frq"
> > Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: applyDeletes: no deletes;
> > skipping
> > BD 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: prune
> > sis=org.apache.lucene.index.SegmentInfos@59d9fe minGen=0 packetCount=0
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: clearFlushPending
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: CMS: now merge
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: CMS:   index:
> > _0(3.5):C73 _1(3.5):C70 _2(3.5):C23 _1a(3.5):C16 _17(3.5):c10
> _19(3.5):c10
> > _18(3.5):c10
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: CMS:   no more
> > merges pending; now return
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: waitForMerges
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: waitForMerges done
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: now call final
> > commit()
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: commit: start
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: commit: enter lock
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: commit: already
> > prepared
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: commit:
> > pendingCommit != null
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: commit: wrote
> > segments file "segments_17"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: now checkpoint
> > "segments_17" [43 segments ; isCommit = true]
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: deleteCommits: now
> > decRef commit "segments_16"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "segments_16"
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: commit: done
> > IW 52 [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: at close:
> > _0(3.5):C73 _1(3.5):C70 _2(3.5):C23 _1a(3.5):C16 _17(3.5):c10
> _19(3.5):c10
> > _18(3.5):c10
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_1a.fdx"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_1a.tis"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_1a.frq"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_1a.tii"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_1a.fnm"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_1a.fdt"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_18.cfs"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_1a.nrm"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_19.cfs"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_17.cfs"
> > IFD [Thu Mar 15 15:25:27 MET 2012; pool-2-thread-1]: delete "_1a.prx"
> >
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; Lucene Merge Thread #3]: CMS:
> merge
> > thread: done
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; Lucene Merge Thread #0]: CMS: set
> > priority of merge thread Lucene Merge Thread #3 to 6
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: now flush at close
> > waitForMerges=true
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: now trigger flush
> > reason=explicit flush
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]:   start flush:
> > applyAllDeletes=true
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]:   index before
> flush
> > _0(3.5):C73 _1(3.5):C70 _2(3.5):C23 _3(3.5):c7 _18(3.5):c10 _1b(3.5):c10
> > _1a(3.5):c10 _19(3.5):c10
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: DW: flush: no
> docs;
> > skipping
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: apply all deletes
> > during flush
> > BD 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: applyDeletes: no
> > deletes; skipping
> > BD 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: prune
> > sis=org.apache.lucene.index.SegmentInfos@e91b11 minGen=0 packetCount=0
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: clearFlushPending
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: CMS: now merge
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: CMS:   index:
> > _0(3.5):C73 _1(3.5):C70 _2(3.5):C23 _3(3.5):c7 _18(3.5):c10 _1b(3.5):c10
> > _1a(3.5):c10 _19(3.5):c10
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: CMS:   no more
> > merges pending; now return
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: waitForMerges
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: waitForMerges done
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: now call final
> > commit()
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: commit: start
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: commit: enter lock
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: commit: already
> > prepared
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: commit:
> > pendingCommit != null
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: commit: wrote
> > segments file "segments_18"
> > IFD [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: now checkpoint
> > "segments_18" [44 segments ; isCommit = true]
> > IFD [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: deleteCommits: now
> > decRef commit "segments_17"
> > IFD [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: delete "segments_17"
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: commit: done
> > IW 53 [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: at close:
> > _0(3.5):C73 _1(3.5):C70 _2(3.5):C23 _3(3.5):c7 _18(3.5):c10 _1b(3.5):c10
> > _1a(3.5):c10 _19(3.5):c10
> > IFD [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: delete "_1b.cfs"
> > IFD [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: delete "_18.cfs"
> > IFD [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: delete "_19.cfs"
> > IFD [Thu Mar 15 15:25:38 MET 2012; pool-2-thread-1]: delete "_1a.cfs"
> >
> > Kind regards,
> > Bogguard
> >
> > On Thu, Mar 15, 2012 at 1:21 PM, Michael McCandless <
> > lucene@mikemccandless.com> wrote:
> >
> >> Hmm, that's odd...
> >>
> >> Can you set IndexWriter's infoStream and then capture the output while
> >> doing the small writes every few seconds and post back?
> >>
> >> If you run CheckIndex on the index does it also report ~3000 segments?
> >>
> >> Mike McCandless
> >>
> >> http://blog.mikemccandless.com
> >>
> >> On Thu, Mar 15, 2012 at 7:14 AM, Tim Bogaert <bogguard@gmail.com>
> wrote:
> >> > Hi,
> >> >
> >> > We migrated our project to Lucene 3.5 and used the TieredMergePolicy
> with
> >> > all its defaults.
> >> > Our project contains a relatively small index (+-90MB) and gets small
> >> > writes every few seconds.
> >> > The behaviour we see is that when we reindex everything works great
> and
> >> > performant,
> >> > but when we keep the index running for some days we see a lot
> (+-3000) of
> >> > very small .cfs files (between 1KB and 10KB) are being generated and
> the
> >> > performance drops significantly.
> >> > Reïndexing solves the problem, but this shouldn't be the solution.
> >> >
> >> > Is there a way to change the behaviour of the .cfs files. I noticed
> you
> >> can
> >> > fully disable it, but I read that this isn't adviced.
> >> >
> >> > Kind regards,
> >> > Bogguard
> >>
> >> ---------------------------------------------------------------------
> >> 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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