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From Shailendra Mudgal <mudgal.shailen...@gmail.com>
Subject Re: Multiple searcher blocked threads
Date Thu, 07 Oct 2010 15:45:34 GMT
Hi Yannis,

Thanks for your reply.

It fixed the problem.

Thanks again.





On Thu, Oct 7, 2010 at 10:52 AM, Yannis Pavlidis <ypavlidis@oneriot.com>wrote:

> I would recommend you use NIOFSDirectory. We had similar issues and after
> we switched to NIOFSDirectory these issues disappeared (dramatically
> reduced).
>
> Also if you are using filters what has really helped us is to use cached
> filters (CachingWrapperFilters).
>
> Hope that helps.
>
> Yannis.
>
> On Oct 6, 2010, at 11:12 PM, Shailendra Mudgal wrote:
>
> > Hi Everyone,
> >
> > Recently we have migrated from lucene 2.2 to lucene 2.9.3.
> >
> > We are having some issues in search. During the load, searchers are
> getting
> > hung up. When we took a process stack, we sound that there are around 450
> > threads are in the blocked state.
> >
> >
> > Thread t@885: (state = BLOCKED)
> > -
> >
> org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexInput.readInternal(byte[],
> > int, int) @bci=7, line=115 (Compiled frame)
> > - org.apache.lucene.store.BufferedIndexInput.readBytes(byte[], int, int,
> > boolean) @bci=203, line=136 (Compiled frame)
> > -
> >
> org.apache.lucene.index.CompoundFileReader$CSIndexInput.readInternal(byte[],
> > int, int) @bci=51, line=247 (Compiled frame)
> > - org.apache.lucene.store.BufferedIndexInput.refill() @bci=87, line=157
> > (Compiled frame)
> > - org.apache.lucene.store.BufferedIndexInput.readByte() @bci=12, line=38
> > (Compiled frame)
> > - org.apache.lucene.store.IndexInput.readVInt() @bci=1, line=78 (Compiled
> > frame)
> > -
> >
> org.apache.lucene.index.TermBuffer.read(org.apache.lucene.store.IndexInput,
> > org.apache.lucene.index.FieldInfos) @bci=6, line=64 (Compiled frame)
> > - org.apache.lucene.index.SegmentTermEnum.next() @bci=64, line=129
> > (Compiled frame)
> > -
> >
> org.apache.lucene.index.SegmentTermEnum.scanTo(org.apache.lucene.index.Term)
> > @bci=25, line=160 (Compiled frame)
> > -
> org.apache.lucene.index.TermInfosReader.get(org.apache.lucene.index.Term,
> > boolean) @bci=211, line=232 (Compiled frame)
> > -
> org.apache.lucene.index.TermInfosReader.get(org.apache.lucene.index.Term)
> > @bci=3, line=179 (Compiled frame)
> > -
> >
> org.apache.lucene.index.SegmentReader.docFreq(org.apache.lucene.index.Term)
> > @bci=12, line=997 (Compiled frame)
> > -
> >
> org.apache.lucene.index.DirectoryReader.docFreq(org.apache.lucene.index.Term)
> > @bci=25, line=633 (Compiled frame)
> > -
> >
> org.apache.lucene.index.FilterIndexReader.docFreq(org.apache.lucene.index.Term)
> > @bci=9, line=195 (Compiled frame)
> > -
> >
> org.apache.lucene.search.IndexSearcher.docFreq(org.apache.lucene.index.Term)
> > @bci=5, line=147 (Compiled frame)
> > -
> >
> org.apache.lucene.search.Similarity.idfExplain(org.apache.lucene.index.Term,
> > org.apache.lucene.search.Searcher) @bci=29, line=765 (Compiled frame)
> > -
> >
> org.apache.lucene.search.TermQuery$TermWeight.<init>(org.apache.lucene.search.TermQuery,
> > org.apache.lucene.search.Searcher) @bci=28, line=46 (Compiled frame)
> > -
> >
> org.apache.lucene.search.TermQuery.createWeight(org.apache.lucene.search.Searcher)
> > @bci=6, line=146 (Compiled frame)
> > -
> >
> org.apache.lucene.search.BooleanQuery$BooleanWeight.<init>(org.apache.lucene.search.BooleanQuery,
> > org.apache.lucene.search.Searcher) @bci=72, line=184 (Compiled f
> > rame)
> > -
> >
> org.apache.lucene.search.BooleanQuery.createWeight(org.apache.lucene.search.Searcher)
> > @bci=6, line=415 (Interpreted frame)
> > -
> >
> org.apache.lucene.search.BooleanQuery$BooleanWeight.<init>(org.apache.lucene.search.BooleanQuery,
> > org.apache.lucene.search.Searcher) @bci=72, line=184 (Compiled f
> > rame)
> > -
> >
> org.apache.lucene.search.BooleanQuery.createWeight(org.apache.lucene.search.Searcher)
> > @bci=6, line=415 (Interpreted frame)
> > -
> org.apache.lucene.search.Query.weight(org.apache.lucene.search.Searcher)
> > @bci=8, line=99 (Interpreted frame)
> > -
> >
> org.apache.lucene.search.Searcher.createWeight(org.apache.lucene.search.Query)
> > @bci=2, line=230 (Interpreted frame)
> > -
> org.apache.lucene.search.Searcher.search(org.apache.lucene.search.Query,
> > org.apache.lucene.search.HitCollector) @bci=3, line=110 (Interpreted
> frame)
> > - lucene.searcher.MySearcherThread.run() @bci=99, line=52 (Compiled
> frame)
> >
> >
> >
> > I have a feeling that these blocked threads are the causing searcher not
> to
> > respond.
> >
> > Our application is running on SunOS and we are using jdk1.6_04
> >
> > Thanks in advance..
> > Vipin
>
>
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