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From "Shai Erera (JIRA)" <>
Subject [jira] Commented: (LUCENE-2294) Create IndexWriterConfiguration and store all of IW configuration there
Date Thu, 11 Mar 2010 20:06:27 GMT


Shai Erera commented on LUCENE-2294:

bq. Should we also move MergedSegmentWarmer to IWC?

I guess it could ... wonder how I missed it ...

bq. This adds more Version.LUCENE_CURRENTs in contrib... 

I added it on purpose, so we know to convert these places when we remove LUCENE_CURRENT. We
can also do this gradually in LUCENE-2305.

bq. There were some tests that previously passed null as analyzers

Those were exactly the cases I wanted to move Analyzer out of the mandatory list. Whatever
you pass will work for those tests, because they obviously don't rely on analysis ... otherwise
they'd had been hit by NPE.
Hmm ... I wonder if I can still pass 'null' for them. I used eclipse search/replace tool to
add the Analyzer to IWC calls. The null argument disappeared completely because they used
the default, so the search/replace tool replaced that w/ Whitespace. I prefer to keep it that
way, to avoid re-changing them again.

bq. There are a number of tests where the analyzers were changed ...

I thought that that's ok, because those tests don't rely on the output of analysis, or otherwise
they should have tested/asserted it. Since they don't, it shouldn't matter to them. But I'll
revert that change.

So two things I need to do:
# revert the changes to those tests
# add warmer to 

> Create IndexWriterConfiguration and store all of IW configuration there
> -----------------------------------------------------------------------
>                 Key: LUCENE-2294
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Shai Erera
>            Assignee: Michael McCandless
>             Fix For: 3.1
>         Attachments:, LUCENE-2294.patch, LUCENE-2294.patch, LUCENE-2294.patch,
> I would like to factor out of all IW configuration parameters into a single configuration
class, which I propose to name IndexWriterConfiguration (or IndexWriterConfig). I want to
store there almost everything besides the Directory, and to reduce all the ctors down to one:
IndexWriter(Directory, IndexWriterConfiguration). What I was thinking of storing there are
the following parameters:
> * All of ctors parameters, except for Directory.
> * The different setters where it makes sense. For example I still think infoStream should
be set on IW directly.
> I'm thinking that IWC should expose everything in a setter/getter methods, and defaults
to whatever IW defaults today. Except for Analyzer which will need to be defined in the ctor
of IWC and won't have a setter.
> I am not sure why MaxFieldLength is required in all IW ctors, yet IW declares a DEFAULT
(which is an int and not MaxFieldLength). Do we still think that 10000 should be the default?
Why not default to UNLIMITED and otherwise let the application decide what LIMITED means for
it? I would like to make MFL optional on IWC and default to something, and I hope that default
will be UNLIMITED. We can document that on IWC, so that if anyone chooses to move to the new
API, he should be aware of that ...
> I plan to deprecate all the ctors and getters/setters and replace them by:
> * One ctor as described above
> * getIndexWriterConfiguration, or simply getConfig, which can then be queried for the
setting of interest.
> * About the setters, I think maybe we can just introduce a setConfig method which will
override everything that is overridable today, except for Analyzer. So someone could do iw.getConfig().setSomething();
> ** The setters on IWC can return an IWC to allow chaining set calls ... so the above
will turn into iw.setConfig(iw.getConfig().setSomething1().setSomething2()); 
> BTW, this is needed for Parallel Indexing (see LUCENE-1879), but I think it will greatly
simplify IW's API.
> I'll start to work on a patch.

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