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More changes from upstream.

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git-svn-id: https://leveldb.googlecode.com/svn/trunk@12 62dab493-f737-651d-591e-8d6aee1b9529
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jorlow@chromium.org
2011-03-22 18:32:49 +00:00
parent 9df5aa892e
commit 13b72af77b
9 changed files with 405 additions and 119 deletions
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doc/impl.html
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@@ -123,8 +123,14 @@ one level-0 file in case some of these files overlap each other.
A compaction merges the contents of the picked files to produce a
sequence of level-(L+1) files. We switch to producing a new
level-(L+1) file after the current output file has reached the target
file size (2MB). The old files are discarded and the new files are
added to the serving state.
file size (2MB). We also switch to a new output file when the key
range of the current output file has grown enough to overlap more then
ten level-(L+2) files. This last rule ensures that a later compaction
of a level-(L+1) file will not pick up too much data from level-(L+2).
<p>
The old files are discarded and the new files are added to the serving
state.
<p>
Compactions for a particular level rotate through the key space. In