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From "Chuck Williams (JIRA)" <>
Subject [jira] Commented: (LUCENE-600) ParallelWriter companion to ParallelReader
Date Mon, 31 Aug 2009 22:36:32 GMT


Chuck Williams commented on LUCENE-600:

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:
>             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
>     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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