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<a href="https://github.com/couchbase/moss/commit/<a class=hub.com/couchbase/moss/commit/81ad193dfd4f6fb5f24810769a8b0c690918d7e7">81ad193df<a href="https://github.com/couchbase/moss/commit/81ad193dfd4f6fb5f24810769a8b0c690918d7e7">&quot;&gt;MB-25705: Introducing an in-memory index for segments

+ This in-memory index is designed to be used for very
  large segments only.
+ Enabled by setting the following store options:
    - SegmentKeysIndexMaxBytes
    - SegmentKeysIndexMinKeyBytes
+ Sample results from test:: (mac)
    {SegmentKeysIndexMaxBytes: 100000; SegmentKeysIndexMinKeyBytes: 1000000}

                  (numItems:    1000000)                           &amp;lt;-------------------- Fetch times --------------------&amp;gt;
                   BatchSize        Writetime         Readtime        Mean      Median        90th        95th        99th
WITHOUT SEG INDEX      10000     1.738389319s     310.956033ms     2.474µs     1.576µs     3.961µs     5.955µs    14.634µs
   WITH SEG INDEX      10000     1.777895136s     281.959804ms     2.166µs     1.456µs     2.952µs     4.165µs     7.103µs
WITHOUT SEG INDEX        100     2.938286922s     207.110626ms     1.641µs     1.126µs     2.292µs      3.36µs     9.661µs
   WITH SEG INDEX        100     3.104446229s     158.762558ms     1.178µs      1.02µs     1.573µs     1.886µs     3.005µs

                  (numItems:   10000000)                           &amp;lt;-------------------- Fetch times --------------------&amp;gt;
                   BatchSize        Writetime         Readtime        Mean      Median        90th        95th        99th
WITHOUT SEG INDEX      10000    22.042242556s      3.40306341s     2.695µs      1.72µs     4.162µs     6.211µs      15.2µs
   WITH SEG INDEX      10000    22.290520313s      3.26300015s     2.535µs     1.664µs     4.086µs     5.977µs    11.636µs
WITHOUT SEG INDEX        100  1m14.310810798s     6.873954506s     6.446µs     1.082µs     3.198µs     4.798µs    12.243µs
   WITH SEG INDEX        100  1m17.617032202s     3.467277155s     3.065µs     1.037µs     3.068µs     4.616µs    11.785µs

Change-Id: I</a><a class="double-link" href="https://github.com/couchbase/moss/commit/<a class="double-link" href="https://github.com/couchbase/moss/commit/41deaf4d1ef68e6ad01fe63c63b5d11a38fde575">41deaf4d1</a>">41deaf4d1</a><a href="https://github.com/couchbase/moss/commit/81ad193dfd4f6fb5f24810769a8b0c690918d7e7">
Reviewed-on: http://review.couchbase.org/82601
Reviewed-by: Steve Yen &lt;steve.yen@gmail.com&gt;
Well-Formed: Build Bot &lt;build@couchbase.com&gt;
Reviewed-by: Sundararaman Sridharan &lt;sundar@couchbase.com>
Tested-by: abhinav dangeti <abhinav@couchbase.com>

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