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From T Vinod Gupta <tvi...@readypulse.com>
Subject Re: index.merge.scheduler exception - java.io.IOException: Input/output error
Date Mon, 09 Jul 2012 11:43:47 GMT
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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