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From Peter Keegan <peterlkee...@gmail.com>
Subject Re: 2 phase commit with external data
Date Fri, 06 Nov 2009 19:46:39 GMT
Here's a new scenario:

1. JVM 1 creates IndexWriter, version 1
2. JVM 2 creates IndexReader, version 1
3. JVM 1 IndexWriter calls prepareCommit()
4. JVM 2 IndexReader.isCurrent() returns false

In step 4, I expected 'isCurrent' to return true until the IndexWriter had
committed in JVM 1. Is this the correct behavior?

Peter


On Fri, Nov 6, 2009 at 11:40 AM, Michael McCandless <
lucene@mikemccandless.com> wrote:

> It will always return a reader reflecting every change done with that
> writer (plus, the index as it was when the writer was opened) before
> getReader was called.
>
> It's unaffected by the call to prepareCommit.
>
> Mike
>
> On Fri, Nov 6, 2009 at 11:35 AM, Peter Keegan <peterlkeegan@gmail.com>
> wrote:
> > Which version of the index will IndexWriter.getReader() return if there
> have
> > been updates, but no call to 'prepareCommit'?
> >
> >
> > On Fri, Nov 6, 2009 at 11:33 AM, Michael McCandless <
> > lucene@mikemccandless.com> wrote:
> >
> >> On Fri, Nov 6, 2009 at 11:22 AM, Peter Keegan <peterlkeegan@gmail.com>
> >> wrote:
> >> >>Can you use IndexWriter.getReader() to get the reader for step 2
> >> > Yes - perfect! I didn't think that would be different than refreshing
> or
> >> > recreating an IndexReader.
> >>
> >> Great!
> >>
> >> getReader() searches the full index, plus uncommitted changes.
> >>
> >> > I don't need to keep the old commit alive. The goal is to keep the
> >> external
> >> > file in synch with the index, so a separate searcher process will see
> >> > consistent data. By postponing both commits, the window where they are
> >> out
> >> > of synch is very small (2 file renames). I record the Lucene index
> >> version
> >> > in the external file for checking synchcronization.
> >>
> >> OK.
> >>
> >> Mike
> >>
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> >>
> >>
> >
>
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