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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2294) Create IndexWriterConfiguration and store all of IW configuration there
Date Fri, 05 Mar 2010 14:02:27 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shai Erera updated LUCENE-2294:
-------------------------------

    Attachment: LUCENE-2294.patch

Patch includes:
* IndexWriterConfig + Test
* Changes to IndexWriter to use IWC
* Changes to DocumentsWriter - removed IndexingChain from its ctor and always use default.

IndexingChain is package-private and so was the ctor on IndexWriter which allowed to set it.
If that's important (e.g. used by SOLR maybe?), then I can add a package-private setting to
IndexWriterConfig which will allow setting this. But since I haven't found any calls in Lucene
(tests nor java), and no implementations of this class besides the default that is in DW,
I thought this can be removed.

I would like to have this patched reviewed, before I go about changing all the code to use
the new IWC (tests + java). If we agree on the details and how it looks and used, I'll do
it - should be straightforward.

> Create IndexWriterConfiguration and store all of IW configuration there
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-2294
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2294
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Shai Erera
>             Fix For: 3.1
>
>         Attachments: 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();
iw.setConfig(newConfig);
> ** 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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