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From Rob Audenaerde <rob.audenae...@gmail.com>
Subject RE: debugging growing index size
Date Fri, 13 Nov 2015 17:22:57 GMT
I haven't disabled unmapping, and I am running out-of-the-box
FSDirectory.open(). As I can see it tries to pick MMap.  For the test I
explicitly constructed a NIOFSDIrectoryReader

OS is (from the top of my head)  CentOS 6.x, Java 1.8.0u33. I can check
later for more details.
On Nov 13, 2015 18:07, "Uwe Schindler" <uwe@thetaphi.de> wrote:

> Hi,
>
> Lucene has the workaround, so it should not happen, UNLESS you explicitly
> disable the hack using MMapDirectory#setEnableUnmap(false).
>
> Uwe
>
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
>
> > -----Original Message-----
> > From: will martin [mailto:wmartinusa@gmail.com]
> > Sent: Friday, November 13, 2015 6:04 PM
> > To: java-user@lucene.apache.org
> > Subject: Re: debugging growing index size
> >
> > Hi Rob:
> >
> >
> > Doesn’t this look like known SE issue JDK-4724038 and discussed by Peter
> > Levart and Uwe Schindler on a lucene-dev thread 9/9/2015?
> >
> > MappedByteBuffer …. what OS are you on Rob? What JVM?
> >
> > http://bugs.java.com/view_bug.do?bug_id=4724038
> >
> > http://mail-archives.apache.org/mod_mbox/lucene-
> > dev/201509.mbox/%3C55F0461A.2070005@gmail.com%3E
> >
> > hth
> > -will
> >
> >
> >
> > > On Nov 13, 2015, at 11:23 AM, Rob Audenaerde
> > <rob.audenaerde@gmail.com> wrote:
> > >
> > > I'm currently running using NIOFS. It seems to prevent the issue from
> > > appearing.
> > >
> > > This is a second run (with applied deletes etc)
> > >
> > > raudenaerd@:/<6>index/index$sudo ls -lSra *.dvd
> > > -rw-r--r--. 1 apache apache      7993 Nov 13 16:09 _y_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache  39048886 Nov 13 17:12 _xod_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache  53699972 Nov 13 17:17 _110e_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache 112855516 Nov 13 17:19 _12r5_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache 151149886 Nov 13 17:13 _y0s_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache 222062059 Nov 13 17:17 _z20_Lucene50_0.dvd
> > >
> > > raudenaerde:/<6>index/index$sudo ls -lSaa *.dvd
> > > -rw-r--r--. 1 apache apache 222062059 Nov 13 17:17 _z20_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache 151149886 Nov 13 17:13 _y0s_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache 112855516 Nov 13 17:19 _12r5_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache  53699972 Nov 13 17:17 _110e_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache  39048886 Nov 13 17:12 _xod_Lucene50_0.dvd
> > > -rw-r--r--. 1 apache apache      7993 Nov 13 16:09 _y_Lucene50_0.dvd
> > >
> > >
> > >
> > > On Thu, Nov 12, 2015 at 3:40 PM, Michael McCandless <
> > > lucene@mikemccandless.com> wrote:
> > >
> > >> Hi Rob,
> > >>
> > >> A couple more things:
> > >>
> > >> Can you print the value of MMapDirectory.UNMAP_SUPPORTED?
> > >>
> > >> Also, can you try your test using NIOFSDirectory instead?  Curious if
> > >> that changes things...
> > >>
> > >> Mike McCandless
> > >>
> > >> http://blog.mikemccandless.com
> > >>
> > >>
> > >> On Thu, Nov 12, 2015 at 7:28 AM, Rob Audenaerde
> > >> <rob.audenaerde@gmail.com> wrote:
> > >>> Curious indeed!
> > >>>
> > >>> I will turn on the IndexFileDeleter.VERBOSE_REF_COUNTS and recreate
> > the
> > >>> logs. Will get back with them in a day hopefully.
> > >>>
> > >>> Thanks for the extra logging!
> > >>>
> > >>> -Rob
> > >>>
> > >>> On Thu, Nov 12, 2015 at 11:34 AM, Michael McCandless <
> > >>> lucene@mikemccandless.com> wrote:
> > >>>
> > >>>> Hmm, curious.
> > >>>>
> > >>>> I looked at the [large] infoStream output and I see segment _3ou7
> > >>>> present on init of IW, a few getReader calls referencing it, then
a
> > >>>> forceMerge that indeed merges it away, yet I do NOT see IW
> > attempting
> > >>>> deletion of its files.
> > >>>>
> > >>>> And indeed I see plenty (too many: many times per second?) of
> > commits
> > >>>> after that, so the index itself is no longer referencing _3ou7.
> > >>>>
> > >>>> If you are failing to close all NRT readers then I would expect
> _3ou7
> > >>>> to be in the lsof output, but it's not.
> > >>>>
> > >>>> The NRT readers close method has logic that notifies IndexWriter
> when
> > >>>> it's done "needing" the files, to emulate "delete on last close"
> > >>>> semantics for filesystems like HDFS that don't do that ... it's
> > >>>> possible something is wrong here.
> > >>>>
> > >>>> Can you set the (public, static) boolean
> > >>>> IndexFileDeleter.VERBOSE_REF_COUNTS to true, and then re-
> > generate this
> > >>>> log?  This causes IW to log the ref count of each file it's tracking
> > >>>> ...
> > >>>>
> > >>>> I'll also add a bit more verbosity to IW when NRT readers are opened
> > >>>> and close, for 5.4.0.
> > >>>>
> > >>>> Mike McCandless
> > >>>>
> > >>>> http://blog.mikemccandless.com
> > >>>>
> > >>>>
> > >>>> On Wed, Nov 11, 2015 at 6:09 AM, Rob Audenaerde
> > >>>> <rob.audenaerde@gmail.com> wrote:
> > >>>>> Hi all,
> > >>>>>
> > >>>>> I'm still debugging the growing-index size. I think closing
index
> > >> readers
> > >>>>> might help (work in progress), but I can't really see them
holding
> on
> > >> to
> > >>>>> files (at least, using lsof ). Restarting the application sheds
> some
> > >>>> light,
> > >>>>> I see logging on files that are no longer referenced.
> > >>>>>
> > >>>>> What I see is that there are files in the index-directory,
that
> seem
> > >> to
> > >>>>> longer referenced..
> > >>>>>
> > >>>>> I put the output of the infoStream online, because is it rather
big
> > >> (30MB
> > >>>>> gzipped):  http://www.audenaerde.org/lucene/merges.log.gz
> > >>>>>
> > >>>>> Output of lsof:  (executed 'sudo lsof *' in the index directory
 ).
> > >> This
> > >>>> is
> > >>>>> on an CentOS box (maybe that influences stuff as well?)
> > >>>>>
> > >>>>> COMMAND   PID   USER   FD   TYPE DEVICE   SIZE/OFF     NODE
NAME
> > >>>>> java    30581 apache  mem    REG  253,0 3176094924 18880508
> > >>>>> _4gs5_Lucene50_0.dvd
> > >>>>> java    30581 apache  mem    REG  253,0  505758610 18880546
> _4gs5.fdt
> > >>>>> java    30581 apache  mem    REG  253,0  369563337 18880631
> > >>>>> _4gs5_Lucene50_0.tim
> > >>>>> java    30581 apache  mem    REG  253,0  176344058 18880623
> > >>>>> _4gs5_Lucene50_0.pos
> > >>>>> java    30581 apache  mem    REG  253,0  378055201 18880606
> > >>>>> _4gs5_Lucene50_0.doc
> > >>>>> java    30581 apache  mem    REG  253,0  372579599 18880400
> > >>>>> _4i5a_Lucene50_0.dvd
> > >>>>> java    30581 apache  mem    REG  253,0   82017447 18880748
> _4g37.cfs
> > >>>>> java    30581 apache  mem    REG  253,0   85376507 18880721
> _4fb3.cfs
> > >>>>> java    30581 apache  mem    REG  253,0  363493917 18880533
> > >>>>> _4ct1_Lucene50_0.dvd
> > >>>>> java    30581 apache  mem    REG  253,0    9421892 18880806
> _4gjc.cfs
> > >>>>> java    30581 apache  mem    REG  253,0   76877461 18880553
> _4ct1.fdt
> > >>>>> java    30581 apache  mem    REG  253,0   46271330 18880661
> > >>>>> _4ct1_Lucene50_0.tim
> > >>>>> java    30581 apache  mem    REG  253,0   26911387 18880653
> > >>>>> _4ct1_Lucene50_0.pos
> > >>>>> java    30581 apache  mem    REG  253,0   54678249 18880568
> > >>>>> _4ct1_Lucene50_0.doc
> > >>>>> java    30581 apache  mem    REG  253,0   76556587 18880328
> _4i5a.fdt
> > >>>>> java    30581 apache  mem    REG  253,0   45032159 18880389
> > >>>>> _4i5a_Lucene50_0.tim
> > >>>>> java    30581 apache  mem    REG  253,0   26486772 18880388
> > >>>>> _4i5a_Lucene50_0.pos
> > >>>>> java    30581 apache  mem    REG  253,0   55411002 18880362
> > >>>>> _4i5a_Lucene50_0.doc
> > >>>>> java    30581 apache  mem    REG  253,0   70484185 18880340
> _4hkn.cfs
> > >>>>> java    30581 apache  mem    REG  253,0   10873921 18880324
> _4gpz.cfs
> > >>>>> java    30581 apache  mem    REG  253,0   17230506 18880524
> _4i11.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    6706969 18880575
> _4i0t.cfs
> > >>>>> java    30581 apache  mem    REG  253,0   15135578 18880624
> _4i0i.cfs
> > >>>>> java    30581 apache  mem    REG  253,0   15368310 18880717
> _4hzp.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    5146140 18880583
> _4hze.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    2917380 18880411
> _4gs5.nvd
> > >>>>> java    30581 apache  mem    REG  253,0    6871469 18880732
> _4hod.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    2860341 18880495
> _4i84.cfs
> > >>>>> java    30581 apache  mem    REG  253,0     835726 18880660
> _4i7z.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    1005595 18880648
> _4i7w.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    5639672 18880401
> _4i4o.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    4388371 18880440
> _4i4a.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    1151845 18880512
> _4i7v.cfs
> > >>>>> java    30581 apache  mem    REG  253,0     941773 18880613
> _4i7x.cfs
> > >>>>> java    30581 apache  mem    REG  253,0     984023 18880588
> _4i7o.cfs
> > >>>>> java    30581 apache  mem    REG  253,0    1790005 18880619
> _4i7y.cfs
> > >>>>> java    30581 apache  mem    REG  253,0     466371 18880515
> _4ct1.nvd
> > >>>>> java    30581 apache  mem    REG  253,0     723280 18880573
> _4i7q.cfs
> > >>>>> java    30581 apache  mem    REG  253,0     806289 18880517
> _4i7h.cfs
> > >>>>> java    30581 apache  mem    REG  253,0      17362 18880520
> _4i9s.cfs
> > >>>>> java    30581 apache  mem    REG  253,0     698362 18880531
> _4i9r.cfs
> > >>>>> java    30581 apache  mem    REG  253,0     483215 18880406
> _4i5a.nvd
> > >>>>> java    30581 apache  mem    REG  253,0      14110 18880416
> _4i9v.cfs
> > >>>>> java    30581 apache  mem    REG  253,0       6121 18880412
> _4i9t.cfs
> > >>>>> java    30581 apache   30wW  REG  253,0          0 18877901
> write.lock
> > >>>>>
> > >>>>> Output of some of the biggest files in the index directory:
> > >>>>>
> > >>>>> -rw-r--r--. 1 apache apache  358684577 Nov 11 08:04 _4fjn.cfs
> > >>>>> -rw-r--r--. 1 apache apache  363493917 Nov 11 07:54
> > >> _4ct1_Lucene50_0.dvd
> > >>>>> -rw-r--r--. 1 apache apache  369563337 Nov 11 08:06
> > >> _4gs5_Lucene50_0.tim
> > >>>>> -rw-r--r--. 1 apache apache  372579599 Nov 11 08:09
> > >> _4i5a_Lucene50_0.dvd
> > >>>>> -rw-r--r--. 1 apache apache  378055201 Nov 11 08:06
> > >> _4gs5_Lucene50_0.doc
> > >>>>> -rw-r--r--. 1 apache apache  427401813 Nov 10 08:14 _3ou7.cfs
> > >>>>> -rw-r--r--. 1 apache apache  505758610 Nov 11 08:04 _4gs5.fdt
> > >>>>> -rw-r--r--. 1 apache apache 1107391579 Nov 10 07:55
> > >> _3k3a_Lucene50_0.dvd
> > >>>>> -rw-r--r--. 1 apache apache 3176094924 Nov 11 08:10
> > >> _4gs5_Lucene50_0.dvd
> > >>>>>
> > >>>>> Note that the 3ou7 and 3k3a segments no longer appear to be
in use?
> > >>>>
> > >>>>
> ---------------------------------------------------------------------
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> > >>>>
> > >>>>
> > >>
> > >> ---------------------------------------------------------------------
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> > >>
> > >>
> >
> >
> > ---------------------------------------------------------------------
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>
>
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