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From Peter Keegan <peterlkee...@gmail.com>
Subject Re: IO exception during merge/optimize
Date Tue, 27 Oct 2009 14:00:12 GMT
After rebuilding the corrupted indexes, the low disk space exception is now
occurring as expected. Sorry for the distraction.

fyi, here are the details:

 java.io.IOException: There is not enough space on the disk
    at java.io.RandomAccessFile.writeBytes(Native Method)
    at java.io.RandomAccessFile.write(Unknown Source)
    at
org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexOutput.flushBuffer(SimpleFSDirectory.java:192)
    at
org.apache.lucene.store.BufferedIndexOutput.flushBuffer(BufferedIndexOutput.java:96)
    at
org.apache.lucene.store.BufferedIndexOutput.flush(BufferedIndexOutput.java:85)
    at
org.apache.lucene.store.BufferedIndexOutput.close(BufferedIndexOutput.java:109)
    at
org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexOutput.close(SimpleFSDirectory.java:199)
    at org.apache.lucene.index.FieldsWriter.close(FieldsWriter.java:144)
    at
org.apache.lucene.index.SegmentMerger.mergeFields(SegmentMerger.java:357)
    at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:153)
    at
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:5011)
    at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4596)
    at
org.apache.lucene.index.IndexWriter.resolveExternalSegments(IndexWriter.java:3786)
    at
org.apache.lucene.index.IndexWriter.addIndexesNoOptimize(IndexWriter.java:3695)


And the corresponding index info log:

IFD [Indexer]: setInfoStream
deletionPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy@256ef705
IW 1 [Indexer]: setInfoStream:
dir=org.apache.lucene.store.SimpleFSDirectory@D:\mnsavs\lresumes3\lresumes3.luc\lresumes3.update.main.4
autoCommit=false
mergePolicy=org.apache.lucene.index.LogByteSizeMergePolicy@181b7c76mergeScheduler=org.apache.lucene.index.ConcurrentMergeScheduler@34883357ramBufferSizeMB=16.0
maxBufferedDocs=-1 maxBuffereDeleteTerms=-1
maxFieldLength=2147483647 index=
IW 1 [Indexer]: flush at addIndexesNoOptimize
IW 1 [Indexer]:   flush: segment=null docStoreSegment=null docStoreOffset=0
flushDocs=false flushDeletes=true flushDocStores=false numDocs=0
numBufDelTerms=0
IW 1 [Indexer]:   index before flush
IW 1 [Indexer]: now start transaction
IW 1 [Indexer]: LMP: findMerges: 2 segments
IW 1 [Indexer]: LMP:   level 8.774518 to 9.524518: 1 segments
IW 1 [Indexer]: LMP:   level 6.2973914 to 7.0473914: 1 segments
IW 1 [Indexer]: CMS: now merge
IW 1 [Indexer]: CMS:   index: _7:Cx1075533->_0** _8:Cx2795**
IW 1 [Indexer]: CMS:   no more merges pending; now return
IW 1 [Indexer]: add merge to pendingMerges: _7:Cx1075533->_0 [total 1
pending]
IW 1 [Indexer]: now merge
  merge=_7:Cx1075533->_0 into _0 [mergeDocStores]
  merge=org.apache.lucene.index.MergePolicy$OneMerge@4d480ea
  index=_7:Cx1075533->_0** _8:Cx2795**
IW 1 [Indexer]: merging _7:Cx1075533->_0 into _0 [mergeDocStores]
IW 1 [Indexer]: merge: total 1074388 docs
IW 1 [Indexer]: commitMerge: _7:Cx1075533->_0 into _0 [mergeDocStores]
index=_7:Cx1075533->_0** _8:Cx2795**
IW 1 [Indexer]: commitMergeDeletes _7:Cx1075533->_0 into _0 [mergeDocStores]
IFD [Indexer]: now checkpoint "segments_1" [2 segments ; isCommit = false]
IW 1 [Indexer]: LMP: findMerges: 2 segments
IW 1 [Indexer]: LMP:   level 8.864886 to 9.614886: 1 segments
IW 1 [Indexer]: LMP:   level 6.2973914 to 7.0473914: 1 segments
IW 1 [Indexer]: add merge to pendingMerges: _8:Cx2795 [total 1 pending]
IW 1 [Indexer]: now merge
  merge=_8:Cx2795 into _1 [mergeDocStores]
  merge=org.apache.lucene.index.MergePolicy$OneMerge@606f8b2b
  index=_0:C1074388 _8:Cx2795**
IW 1 [Indexer]: merging _8:Cx2795 into _1 [mergeDocStores]
IW 1 [Indexer]: merge: total 2795 docs
IW 1 [Indexer]: handleMergeException: merge=_8:Cx2795 into _1
[mergeDocStores] exc=java.io.IOException: There is not enough space on the
disk
IW 1 [Indexer]: hit exception during merge
IFD [Indexer]: refresh [prefix=_1]: removing newly created unreferenced file
"_1.fdt"
IFD [Indexer]: delete "_1.fdt"
IFD [Indexer]: refresh [prefix=_1]: removing newly created unreferenced file
"_1.fdx"
IFD [Indexer]: delete "_1.fdx"
IFD [Indexer]: refresh [prefix=_1]: removing newly created unreferenced file
"_1.fnm"
IFD [Indexer]: delete "_1.fnm"
IW 1 [Indexer]: now rollback transaction
IW 1 [Indexer]: all running merges have aborted
IFD [Indexer]: now checkpoint "segments_1" [0 segments ; isCommit = false]
IFD [Indexer]: delete "_0.nrm"
IFD [Indexer]: delete "_0.tis"
IFD [Indexer]: delete "_0.fnm"
IFD [Indexer]: delete "_0.tii"
IFD [Indexer]: delete "_0.frq"
IFD [Indexer]: delete "_0.fdx"
IFD [Indexer]: delete "_0.prx"
IFD [Indexer]: delete "_0.fdt"


Peter

On Mon, Oct 26, 2009 at 3:59 PM, Peter Keegan <peterlkeegan@gmail.com>wrote:

>
>
> On Mon, Oct 26, 2009 at 3:00 PM, Michael McCandless <
> lucene@mikemccandless.com> wrote:
>
>> On Mon, Oct 26, 2009 at 2:55 PM, Peter Keegan <peterlkeegan@gmail.com>
>> wrote:
>> > On Mon, Oct 26, 2009 at 2:50 PM, Michael McCandless <
>> > lucene@mikemccandless.com> wrote:
>> >
>> >> On Mon, Oct 26, 2009 at 10:44 AM, Peter Keegan <peterlkeegan@gmail.com
>> >
>> >> wrote:
>> >> > Even running in console mode, the exception is difficult to
>> interpret.
>> >> > Here's an exception that I think occurred during an add document,
>> commit
>> >> or
>> >> > close:
>> >> > doc counts differ for segment _g: field Reader shows 137 but
>> segmentInfo
>> >> > shows 5777
>> >>
>> >> That's spooky.  Do you have the full exception for this one?  What IO
>> >> system are you running on?  (Is it just a local drive on your windows
>> >> computer?) It's almost as if the IO system is not generating an
>> >> IOException to Java when disk fills up.
>> >>
>> >
>> > Index and code are all on a local drive. There is no other exception
>> coming
>> > back - just what I reported.
>>
>> But, you didn't report a traceback for this first one?
>>
>
> Yes, I need to add some more printStackTrace calls.
>
>
>>
>> >> > I ensured that the disk space was low before updating the index.
>> >>
>> >> You mean, to intentionally test the disk-full case?
>> >>
>> >
>> > Yes, that's right.
>>
>> OK.  Can you turn on IndexWriter's infoStream, get this disk full /
>> corruption to happen again, and post back the resulting output?  Make
>> sure your index first passes CheckIndex before starting (so we don't
>> begin the test w/ any pre-existing index corruption).
>>
>
> Good point about CheckIndex.  I've already found 2 bad ones. I will build
> new indexes from scratch. This will take a while.
>
>
>> >> > On another occasion, the exception was:
>> >> > background merge hit exception: _0:C1080260 _1:C139 _2:C123 _3:C107
>> >> _4:C126
>> >> > _5:C121 _6:C126 _7:C711 _8:C116 into _9 [optimize] [mergeDocStores]
>> >>
>> >> In this case, the SegmentMerger was trying to open this segment, but
>> >> on attempting to read the first int from the fdx (fields index) file
>> >> for one of the segments, it hit EOF.
>> >>
>> >> This is also spooky -- this looks like index corruption, which should
>> >> never happen on hitting disk full.
>> >>
>> >
>> > That's what I thought, too. Could Lucene be catching the IOException and
>> > turning it into a different exception?
>>
>> I think that's unlikely, but I guess possible.  We have "disk full"
>> tests in the unit tests, that throw an IOException at different times.
>>
>> What exact windows version are you using?  The local drive is NTFS?
>>
>
> Windows Server 2003 Enterprise x64 SP2. Local drive is NTFS
>
>
>>
>> Mike
>>
>> ---------------------------------------------------------------------
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>>
>>
>

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