couchbase / moss / 187

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travis-ci

MB-22834: Adding histograms to store, coll

+ To start with:
    - Adding store level stats: persistTimings, compactTimings
    - Adding colleciton level stats: batchExecuteTimings, mergerTimings
+ New APIs to retrieve these timings:
    - store.Histograms()
    - collection.Histograms()
+ Unit test

Sample output of String():
ExecuteBatchUsecs (100 Total)
[4 - 16]    95.00%   95.00% ############################## (95)
[16 - 64]    5.00%  100.00% # (5)

MergerUsecs (108 Total)
[0 - 4]     25.00%   25.00% ########## (27)
[4 - 16]     2.78%   27.78% # (3)
[16 - 64]   72.22%  100.00% ############################## (78)

Pre-requisite: http://review.couchbase.org/#/c/73787/

Change-Id: Iec631b5fa
Reviewed-on: http://review.couchbase.org/73636
Reviewed-by: Steve Yen <steve.yen@gmail.com>
Tested-by: abhinav dangeti <abhinav@couchbase.com>

45 of 45 new or added lines in 7 files covered. (100.0%)

2853 of 3566 relevant lines covered (80.01%)

8888.74 hits per line