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From Erick Erickson <erickerick...@gmail.com>
Subject Re: index.merge.scheduler exception - java.io.IOException: Input/output error
Date Mon, 09 Jul 2012 13:27:01 GMT
no, you can't delete those files, and you can't regenerate just those files,
all the various segment files are necessary and intertwined...

Consider using the CheckIndex facility, see:
http://solr.pl/en/2011/01/17/checkindex-for-the-rescue/

note, the CheckIndex class is contained in the lucene core jar....

You can run it with the -fix option to repair (at, perhaps, the expense
of loss of some documents) if you choose, but running it without
that option first is probably a good idea..

Best
Erick

On Mon, Jul 9, 2012 at 7:43 AM, T Vinod Gupta <tvinod@readypulse.com> wrote:
> this is on local file system on amazon ec2 host. the file system was fine
> until a week ago when the outage happened and there were probably some
> system glitches. i have seen this issue since then.. sometimes regular
> commands like less or ls hang for many seconds even though there is no
> cpu/memory pressure on the machine.
>
> in my case, there are only 2 unique entries for which i see this error. one
> for a .fdt file and one for a .tis file. is it possible to regenerate those
> files somehow? if i delete those 2 files, will the entire index get
> corrupted? im ok to live with some data loss if it makes it more stable and
> performant.
>
> thanks
>
> On Mon, Jul 9, 2012 at 2:28 AM, Ian Lea <ian.lea@gmail.com> wrote:
>
>> Is this on a local or remote file system?  Is the file system itself
>> OK?  Is something else messing with your lucene index at the same
>> time?
>>
>>
>> --
>> Ian.
>>
>>
>> On Sun, Jul 8, 2012 at 8:58 PM, T Vinod Gupta <tvinod@readypulse.com>
>> wrote:
>> > Hi,
>> > My log files are showing the below exceptions almost at twice a minute
>> > frequency. what is causing it and how can i fix it? I am not using lucene
>> > directly but instead using elasticsearch (0.18.7 version). but since the
>> > stack trace is all lucene, i am sending it to this mailing list.
>> >
>> > also, my queries are taking a long time to execute (sometimes take a
>> > minute). could this be contributing to it somehow?
>> >
>> > [2012-07-08 19:44:19,887][WARN ][index.merge.scheduler    ] [<my node
>> > name>] [twitter][4] failed to merge
>> > java.io.IOException: Input/output error:
>> > NIOFSIndexInput(path="/media/ephemeral0
>> > /ES_data/elasticsearch/nodes/0/indices/twitter/4/index/_2h29k.tis")
>> >         at
>> > org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.readInternal(N
>> > IOFSDirectory.java:180)
>> >         at
>> > org.apache.lucene.store.BufferedIndexInput.refill(BufferedIndexInput.
>> > java:229)
>> >         at
>> >
>> org.apache.lucene.store.BufferedIndexInput.readByte(BufferedIndexInput.java:39)
>> >         at org.apache.lucene.store.DataInput.readVInt(DataInput.java:105)
>> >         at
>> >
>> org.apache.lucene.store.BufferedIndexInput.readVInt(BufferedIndexInput.java:197)
>> >         at org.apache.lucene.index.TermBuffer.read(TermBuffer.java:86)
>> >         at
>> > org.apache.lucene.index.SegmentTermEnum.next(SegmentTermEnum.java:133)
>> >         at
>> > org.apache.lucene.index.SegmentMergeInfo.next(SegmentMergeInfo.java:72)
>> >         at
>> >
>> org.apache.lucene.index.SegmentMerger.mergeTermInfos(SegmentMerger.java:546)
>> >         at
>> > org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:473)
>> >         at
>> > org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:109)
>> >         at
>> > org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4295)
>> >         at
>> org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3940)
>> >         at
>> >
>> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:388)
>> >         at
>> >
>> org.apache.lucene.index.TrackingConcurrentMergeScheduler.doMerge(TrackingConcurrentMergeScheduler.java:88)
>> >         at
>> >
>> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:456)
>> > Caused by: java.io.IOException: Input/output error
>> >         at sun.nio.ch.FileDispatcher.pread0(Native Method)
>> >         at sun.nio.ch.FileDispatcher.pread(FileDispatcher.java:49)
>> >         at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:248)
>> >         at sun.nio.ch.IOUtil.read(IOUtil.java:224)
>> >         at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:663)
>> >         at
>> >
>> org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.readInternal(NIOFSDirectory.java:162)
>> >         ... 15 more
>> >
>> > thanks
>>
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