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From "Jason Rutherglen (JIRA)" <>
Subject [jira] Updated: (LUCENE-1516) Integrate IndexReader with IndexWriter
Date Sat, 21 Feb 2009 01:38:02 GMT


Jason Rutherglen updated LUCENE-1516:

    Attachment: LUCENE-1516.patch

There's concurrency issues to work out.

- IW.getReader returns a cloned read only reader 
- Removed IW.reopenReader 
- All test methods pass except testAddIndexesAndDoDeletesThreads. testAddIndexesAndDoDeletesThreads
currently merges indexes concurrently (and fails). In the future the
method will test merging, deleting, and searching concurrently. 
- Concurrent merges fail when "ant test-core" is run 
- DocumentsWriter.applyDeletes deletes again at the SegmentReader level
- What happens when a user executes IR.clone(true) on a read only

> Integrate IndexReader with IndexWriter 
> ---------------------------------------
>                 Key: LUCENE-1516
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.4
>            Reporter: Jason Rutherglen
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.9
>         Attachments: LUCENE-1516.patch, LUCENE-1516.patch, LUCENE-1516.patch, LUCENE-1516.patch,
LUCENE-1516.patch, LUCENE-1516.patch, LUCENE-1516.patch, LUCENE-1516.patch
>   Original Estimate: 672h
>  Remaining Estimate: 672h
> The current problem is an IndexReader and IndexWriter cannot be open
> at the same time and perform updates as they both require a write
> lock to the index. While methods such as IW.deleteDocuments enables
> deleting from IW, methods such as IR.deleteDocument(int doc) and
> norms updating are not available from IW. This limits the
> capabilities of performing updates to the index dynamically or in
> realtime without closing the IW and opening an IR, deleting or
> updating norms, flushing, then opening the IW again, a process which
> can be detrimental to realtime updates. 
> This patch will expose an IndexWriter.getReader method that returns
> the currently flushed state of the index as a class that implements
> IndexReader. The new IR implementation will differ from existing IR
> implementations such as MultiSegmentReader in that flushing will
> synchronize updates with IW in part by sharing the write lock. All
> methods of IR will be usable including reopen and clone. 

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