Rev 3767: A little bit more in http://bzr.arbash-meinel.com/branches/bzr/1.8-dev/btree_buffer

[John Arbash Meinel]

At http://bzr.arbash-meinel.com/branches/bzr/1.8-dev/btree_buffer

------------------------------------------------------------
revno: 3767
revision-id: john at arbash-meinel.com-20081006190823-8fqjwof4rf8a1xzl
parent: john at arbash-meinel.com-20081004161137-66rj5cqt4r2dxw32
committer: John Arbash Meinel <john at arbash-meinel.com>
branch nick: btree_buffer
timestamp: Mon 2008-10-06 14:08:23 -0500
message:
  A little bit more
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=== modified file 'doc/developers/btree_index_request_expansion.rst'
--- a/doc/developers/btree_index_request_expansion.rst	2008-10-04 16:11:37 +0000
+++ b/doc/developers/btree_index_request_expansion.rst	2008-10-06 19:08:23 +0000
@@ -254,4 +254,7 @@
    all pages could fit in a single width request.
 
 4. When expanding, add nodes that are "next" to the node in question, which
-   have not been read yet.
+   have not been read yet. This also has another interesting property. When
+   searching in a given direction, on the first request, we will pre-read both
+   directions. Future requests will only pre-read in one direction, as the
+   other direction is cached.