Re: How does delete work?

[Doug Cutting]

Merging happens constantly as documents are added. Each document is initially added in its own segment, and pushed onto the segment stack. Whenever there are mergeFactor segments on the top of the stack that are the same size, these are merged together into a new single segment that replaces them. So, if mergeFactor is 10, and you've added 122 documents, the stack will have five segments, as follows:
document 121
document 120
documents 110-119
documents 100-109
documents 0-100
The next merge will happen after document 129 is added, when a new segment will replace the segments for document 120 through document 129 with a new single segment.

It's actually a little more complicated than that, since (among other reasons) after docuuments are deleted a segment's size will no longer be exactly a power of the mergeFactor.

Doug

Otis Gospodnetic wrote:

This is via mergeFactor?

--- Doug Cutting <[EMAIL PROTECTED]> wrote:

The data is actually removed the next time its segment is merged. Optimizing forces it to happen, but it will also eventually happen as

more documents are added to the index, without optimization.

Scott Ganyo wrote:

It just marks the record as deleted.  The record isn't actually

removed

until the index is optimized.

Scott

Rob Outar wrote:

Hello all,

   I used the delete(Term) method, then I looked at the index

files,

only one
file changed "_1tx.del"  I found references to the file still in

some

of the
index files, so my question is how does Lucene handle deletes?

Thanks,

Rob


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