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From "Chuck Williams (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-600) ParallelWriter companion to ParallelReader
Date Mon, 12 Jun 2006 20:49:32 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-600?page=all ]

Chuck Williams updated LUCENE-600:
----------------------------------

    Attachment: ParallelWriter.patch

Patch to create and integrate ParallelWriter, Writable and TestParallelWriter -- also modifies
build to use java 1.5.


> ParallelWriter companion to ParallelReader
> ------------------------------------------
>
>          Key: LUCENE-600
>          URL: http://issues.apache.org/jira/browse/LUCENE-600
>      Project: Lucene - Java
>         Type: Improvement

>   Components: Index
>     Versions: 2.1
>     Reporter: Chuck Williams
>  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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