ParallelReader fails on deletes and on seeks of previously unused fields
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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
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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