[ http://issues.apache.org/jira/browse/LUCENE-561?page=all ]
Chuck Williams updated LUCENE-561:
----------------------------------
Attachment: ParallelReaderBugs.patch
> ParallelReader fails on deletes and on seeks of previously unused fields
> ------------------------------------------------------------------------
>
> Key: LUCENE-561
> URL: http://issues.apache.org/jira/browse/LUCENE-561
> Project: Lucene - Java
> Type: Bug
> Components: Index
> Versions: 2.0
> Environment: All
> Reporter: Chuck Williams
> Attachments: ParallelReaderBugs.patch
>
> In using ParallelReader I've hit two bugs:
> 1. ParallelReader.doDelete() and doUndeleteAll() call doDelete() and
> doUndeleteAll() on the subreaders, but these methods do not set hasChanges.
> Thus the changes are lost when the readers are closed. The fix is to call
> deleteDocument() and undeleteAll() on the subreaders instead.
> 2. ParallelReader discovers the fields in each subindex by using
> IndexReader.getFieldNames() which only finds fields that have occurred on at
> least one document. In general a parallel index is designed with assignments
> of fields to sub-indexes and term seeks (including searches) may be done on
> any of those fields, even if no documents in a particular state of the index
> have yet had an assigned field. Seeks/searches on fields that have not yet
> been indexed generated an NPE in ParallelReader's various inner class seek()
> and next() methods because fieldToReader.get() returns null on the unseen
> field. The fix is to extend the add() methods to supply the correct list of
> fields for each subindex.
> Patch that corrects both of these issues attached.
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