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From "vivek sar" <vivex...@gmail.com>
Subject Re: DefaultIndexAccessor
Date Thu, 28 Feb 2008 21:26:25 GMT
Mark,

  We deployed our indexer (using defaultIndexAccessor) on one of the
production site and getting this error,

Caused by: java.util.concurrent.RejectedExecutionException
	at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(Unknown
Source)
	at java.util.concurrent.ThreadPoolExecutor.reject(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.execute(Unknown Source)
	at org.apache.lucene.indexaccessor.DefaultIndexAccessor.release(DefaultIndexAccessor.java:514)


This is happening repeatedly every time the indexer runs.

This is running your latest IndexAccessor-021508 code.  Any ideas
(it's kind of urgent for us)?

Thanks,
-vivek


On Fri, Feb 15, 2008 at 6:50 PM, vivek sar <vivextra@gmail.com> wrote:
> 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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