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Date: Fri, 15 Feb 2008 16:38:51 -0800
From: "vivek sar" <vivextra@gmail.com>
To: java-user@lucene.apache.org
Subject: Re: DefaultIndexAccessor
In-Reply-To: <47A9E258.7020400@ai.sri.com>
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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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