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Posted to dev@lucene.apache.org by "Michael Busch (JIRA)" <ji...@apache.org> on 2009/08/31 10:07:33 UTC
[jira] Closed: (LUCENE-600) ParallelWriter companion to
ParallelReader
[ https://issues.apache.org/jira/browse/LUCENE-600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Busch closed LUCENE-600.
--------------------------------
Resolution: Won't Fix
This solution has the severe drawback that it only works if the IndexWriter is used in flush-by-docCount mode. Lucene's default behavior is flush-by-size now.
See LUCENE-1879 for a more generic approach.
> ParallelWriter companion to ParallelReader
> ------------------------------------------
>
> Key: LUCENE-600
> URL: https://issues.apache.org/jira/browse/LUCENE-600
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.1
> Reporter: Chuck Williams
> Priority: Minor
> Attachments: ParallelWriter.patch
>
>
> A new class ParallelWriter is provided that serves as a companion to ParallelReader. ParallelWriter meets all of the doc-id synchronization requirements of ParallelReader, subject to:
> 1. ParallelWriter.addDocument() is synchronized, which might have an adverse effect on performance. The writes to the sub-indexes are, however, done in parallel.
> 2. The application must ensure that the ParallelReader is never reopened inside ParallelWriter.addDocument(), else it might find the sub-indexes out of sync.
> 3. The application must deal with recovery from ParallelWriter.addDocument() exceptions. Recovery must restore the synchronization of doc-ids, e.g. by deleting any trailing document(s) in one sub-index that were not successfully added to all sub-indexes, and then optimizing all sub-indexes.
> A new interface, Writable, is provided to abstract IndexWriter and ParallelWriter. This is in the same spirit as the existing Searchable and Fieldable classes.
> This implementation uses java 1.5. The patch applies against today's svn head. All tests pass, including the new TestParallelWriter.
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