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https://issues.apache.org/jira/browse/LUCENE-600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749660#action_12749660
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Chuck Williams commented on LUCENE-600:
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Erratum: "deletion changes doc-id's by purging deleted documents" -->
"*merging* changes doc-id's by purging deleted documents"
> 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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