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From "vivek sar" <vivex...@gmail.com>
Subject Re: DefaultIndexAccessor
Date Sat, 16 Feb 2008 02:50:20 GMT
Mark,

Thanks for the quick fix. Actually, it is possible that there might
had been simultaneous queries using the MultiSearcher. I assumed it
was thread-safe, thus was re-using the same instance. I'll update my
application code as well.

Thanks,
-vivek

On Feb 15, 2008 5:56 PM, Mark Miller <markrmiller@gmail.com> wrote:
> Here is the fix: https://issues.apache.org/jira/browse/LUCENE-1026
>
>
> vivek sar wrote:
> > Mark,
> >
> >    There seems to be some issue with DefaultMultiIndexAccessor.java. I
> > got following NPE exception,
> >
> >      2008-02-13 07:10:28,021 ERROR [http-7501-Processor6] ReportServiceImpl -
> > java.lang.NullPointerException
> >         at org.apache.lucene.indexaccessor.DefaultMultiIndexAccessor.release(DefaultMultiIndexAccessor.java:89)
> >
> > Looks like the IndexAccessor for one of the Searcher in the
> > MultiSearcher returned null. Not sure how is that possible, any ideas
> > how is that possible?
> >
> > In my case it caused a critical error as the writer thread was stuck
> > forever (we found out after couple of days) because of this,
> >
> > "PS thread 9" prio=1 tid=0x00002aac70eb95d0 nid=0x6ba in Object.wait()
> > [0x0000000047533000..0x0000000047533b80]
> >         at java.lang.Object.wait(Native Method)
> >         - waiting on <0x00002aab3e5c7700> (a
> > org.apache.lucene.indexaccessor.DefaultIndexAccessor)
> >         at java.lang.Object.wait(Unknown Source)
> >         at org.apache.lucene.indexaccessor.DefaultIndexAccessor.waitForReadersAndCloseCached(DefaultIndexAccessor.java:593)
> >         at org.apache.lucene.indexaccessor.DefaultIndexAccessor.release(DefaultIndexAccessor.java:510)
> >         - locked <0x00002aab3e5c7700> (a
> > org.apache.lucene.indexaccessor.DefaultIndexAccessor)
> >
> > The only way to recover was to re-start the application.
> >
> > I use both MultiSearcher and IndexSearcher in my application, I've
> > looked at your code but not able to pinpoint how can it go wrong? Of
> > course, you do have to check for null in the
> > MultiIndexAccessor.release, but how could you get null index accessor
> > at first place?
> >
> > I do call IndexAccessor.close during partitioning of indexes, but the
> > close should wait for all Searchers to close before doing anything.
> >
> > Do you have any updates to your code since 02/04/2008?
> >
> > Thanks,
> > -vivek
> >
> > On Feb 6, 2008 8:37 AM, Jay <yu@ai.sri.com> wrote:
> >
> >> Thanks for your clarifications, Mark!
> >>
> >>
> >> Jay
> >>
> >>
> >> Mark Miller wrote:
> >>
> >>>> 5. Although currently IndexSearcher.close() does almost nothing except
> >>>> to close the internal index reader, it might be a safer to close
> >>>> searcher itself as well in closeCachedSearcher(), just in case, the
> >>>> searcher may have other resources to release in the future version of
> >>>> Lucene.
> >>>>
> >>> Didn't catch that "as well". You are right, great idea Jay, thanks.
> >>>
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> >>
> >
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> >
> >
>
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