Places in code with 6 or more lines that are exactly the same.
Intro
- For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
- Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
- You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.
- To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:
- Avoid Repetition, MartinFlower.com (IEEE Software article)
- Refactoring duplicated code, sourcemaking.com
- Beck Design Rules, MartinFowler.com
- DRY (Don't Repeat Yourself) Principle, Wikipedia
- The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
- Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:
- "Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"
- Reducing Coupling, MartinFlower.com (IEEE Software article):
- "There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."
Duplication Overall
- 9% duplication:
- 118,218 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 11,027 duplicated lines
- 4,510 duplicates
Duplication per Extension
Duplication per Component (primary)
Duplication Between Components (50+ lines)
Open 3D force graph...
Show more details on duplication between components...
From Component
--> To Component
Duplicated
Lines
File Pairs
Details
src/kudu/consensus (<1%)
--> src/kudu/util (<1%)
219
42 file pairs
details...
src/kudu/rpc (<1%)
--> src/kudu/util (<1%)
184
28 file pairs
details...
src/kudu/consensus (<1%)
--> src/kudu/rpc (<1%)
165
24 file pairs
details...
src/kudu/common (4%)
--> src/kudu/consensus (<1%)
152
12 file pairs
details...
src/kudu/fs (<1%)
--> src/kudu/util (<1%)
150
7 file pairs
details...
src/kudu/common (4%)
--> src/kudu/util (<1%)
144
14 file pairs
details...
ROOT (31%)
--> src/kudu/util (<1%)
144
14 file pairs
details...
src/kudu/server (6%)
--> src/kudu/util (<1%)
136
7 file pairs
details...
src/kudu/security (1%)
--> src/kudu/util (<1%)
136
7 file pairs
details...
src/kudu/tserver (6%)
--> src/kudu/util (<1%)
136
7 file pairs
details...
src/kudu/tools (<1%)
--> src/kudu/util (<1%)
136
7 file pairs
details...
ROOT (27%)
--> src/kudu/consensus (<1%)
128
12 file pairs
details...
src/kudu/consensus (<1%)
--> src/kudu/security (1%)
117
6 file pairs
details...
src/kudu/consensus (<1%)
--> src/kudu/tools (<1%)
117
6 file pairs
details...
src/kudu/consensus (<1%)
--> src/kudu/tserver (5%)
117
6 file pairs
details...
src/kudu/consensus (<1%)
--> src/kudu/server (5%)
117
6 file pairs
details...
src/kudu/consensus (<1%)
--> src/kudu/fs (<1%)
117
6 file pairs
details...
src/kudu/common (3%)
--> src/kudu/rpc (<1%)
101
8 file pairs
details...
ROOT (20%)
--> src/kudu/rpc (<1%)
96
8 file pairs
details...
src/kudu/rpc (<1%)
--> src/kudu/tserver (3%)
82
4 file pairs
details...
src/kudu/rpc (<1%)
--> src/kudu/tools (<1%)
82
4 file pairs
details...
src/kudu/fs (<1%)
--> src/kudu/rpc (<1%)
82
4 file pairs
details...
src/kudu/rpc (<1%)
--> src/kudu/server (3%)
82
4 file pairs
details...
src/kudu/rpc (<1%)
--> src/kudu/security (1%)
82
4 file pairs
details...
ROOT (13%)
--> src/kudu/common (2%)
64
4 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| src/kudu/consensus (<1%) --> src/kudu/util (<1%) |
219 | 42 file pairs | details... |
| src/kudu/rpc (<1%) --> src/kudu/util (<1%) |
184 | 28 file pairs | details... |
| src/kudu/consensus (<1%) --> src/kudu/rpc (<1%) |
165 | 24 file pairs | details... |
| src/kudu/common (4%) --> src/kudu/consensus (<1%) |
152 | 12 file pairs | details... |
| src/kudu/fs (<1%) --> src/kudu/util (<1%) |
150 | 7 file pairs | details... |
| src/kudu/common (4%) --> src/kudu/util (<1%) |
144 | 14 file pairs | details... |
| ROOT (31%) --> src/kudu/util (<1%) |
144 | 14 file pairs | details... |
| src/kudu/server (6%) --> src/kudu/util (<1%) |
136 | 7 file pairs | details... |
| src/kudu/security (1%) --> src/kudu/util (<1%) |
136 | 7 file pairs | details... |
| src/kudu/tserver (6%) --> src/kudu/util (<1%) |
136 | 7 file pairs | details... |
| src/kudu/tools (<1%) --> src/kudu/util (<1%) |
136 | 7 file pairs | details... |
| ROOT (27%) --> src/kudu/consensus (<1%) |
128 | 12 file pairs | details... |
| src/kudu/consensus (<1%) --> src/kudu/security (1%) |
117 | 6 file pairs | details... |
| src/kudu/consensus (<1%) --> src/kudu/tools (<1%) |
117 | 6 file pairs | details... |
| src/kudu/consensus (<1%) --> src/kudu/tserver (5%) |
117 | 6 file pairs | details... |
| src/kudu/consensus (<1%) --> src/kudu/server (5%) |
117 | 6 file pairs | details... |
| src/kudu/consensus (<1%) --> src/kudu/fs (<1%) |
117 | 6 file pairs | details... |
| src/kudu/common (3%) --> src/kudu/rpc (<1%) |
101 | 8 file pairs | details... |
| ROOT (20%) --> src/kudu/rpc (<1%) |
96 | 8 file pairs | details... |
| src/kudu/rpc (<1%) --> src/kudu/tserver (3%) |
82 | 4 file pairs | details... |
| src/kudu/rpc (<1%) --> src/kudu/tools (<1%) |
82 | 4 file pairs | details... |
| src/kudu/fs (<1%) --> src/kudu/rpc (<1%) |
82 | 4 file pairs | details... |
| src/kudu/rpc (<1%) --> src/kudu/server (3%) |
82 | 4 file pairs | details... |
| src/kudu/rpc (<1%) --> src/kudu/security (1%) |
82 | 4 file pairs | details... |
| ROOT (13%) --> src/kudu/common (2%) |
64 | 4 file pairs | details... |
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 36 | x 2 | cmake_modulescmake_modules | 28:72 (34%)113:158 (17%) | view | |
| 31 | x 2 | src/kudu/gutilsrc/kudu/gutil | 3467:3497 (1%)3529:3559 (1%) | view | |
| 31 | x 2 | src/kudu/gutilsrc/kudu/gutil/auxiliary | 137:185 (16%)119:171 (12%) | view | |
| 31 | x 2 | src/kudu/gutil/auxiliarysrc/kudu/gutil/auxiliary | 143:187 (24%)285:329 (12%) | view | |
| 31 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2906:2936 (1%)2968:2998 (1%) | view | |
| 30 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2348:2377 (<1%)2408:2437 (<1%) | view | |
| 30 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2930:2961 (<1%)3491:3522 (<1%) | view | |
| 29 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2872:2902 (<1%)3433:3463 (<1%) | view | |
| 28 | x 2 | src/kudu/gutilsrc/kudu/gutil | 1832:1859 (<1%)1886:1913 (<1%) | view | |
| 28 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2372:2401 (<1%)2931:2960 (<1%) | view | |
| 28 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2818:2847 (<1%)3379:3408 (<1%) | view | |
| 28 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2372:2401 (<1%)3492:3521 (<1%) | view | |
| 27 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2316:2344 (<1%)2873:2901 (<1%) | view | |
| 27 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2316:2344 (<1%)3434:3462 (<1%) | view | |
| 27 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2768:2796 (<1%)3329:3357 (<1%) | view | |
| 26 | x 2 | src/kudu/gutilsrc/kudu/gutil | 1990:2020 (1%)2325:2355 (1%) | view | |
| 26 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2264:2291 (<1%)3380:3407 (<1%) | view | |
| 26 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2264:2291 (<1%)2819:2846 (<1%) | view | |
| 26 | x 2 | src/kudu/toolssrc/kudu/tools | 527:564 (1%)882:919 (1%) | view | |
| 26 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2405:2430 (<1%)3526:3551 (<1%) | view | |
| 26 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2725:2752 (<1%)3286:3313 (<1%) | view | |
| 25 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2216:2242 (<1%)3330:3356 (<1%) | view | |
| 25 | x 2 | src/kudu/gutilsrc/kudu/gutil | 3361:3385 (<1%)3415:3439 (<1%) | view | |
| 25 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2684:2710 (<1%)3245:3271 (<1%) | view | |
| 25 | x 2 | src/kudu/toolssrc/kudu/tools | 1326:1360 (1%)1390:1424 (1%) | view | |
| 25 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2216:2242 (<1%)2769:2795 (<1%) | view | |
| 25 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2800:2824 (<1%)2854:2878 (<1%) | view | |
| 24 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2175:2200 (<1%)3287:3312 (<1%) | view | |
| 24 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2246:2269 (<1%)2298:2321 (<1%) | view | |
| 24 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2175:2200 (<1%)2726:2751 (<1%) | view | |
| 24 | x 2 | src/kudu/toolssrc/kudu/tools | 527:560 (1%)988:1021 (1%) | view | |
| 24 | x 2 | src/kudu/toolssrc/kudu/tools | 882:915 (1%)988:1021 (1%) | view | |
| 23 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2408:2430 (<1%)3467:3489 (<1%) | view | |
| 23 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2348:2370 (<1%)3529:3551 (<1%) | view | |
| 23 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2348:2370 (<1%)3467:3489 (<1%) | view | |
| 23 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2646:2670 (<1%)3207:3231 (<1%) | view | |
| 23 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2136:2160 (<1%)3246:3270 (<1%) | view | |
| 23 | x 2 | src/kudu/gutilsrc/kudu/gutil | 2136:2160 (<1%)2685:2709 (<1%) | view | |
| 23 | x 2 | src/kudu/gutilsrc/kudu/gutil | 881:905 (<1%)1315:1339 (<1%) | view | |
| 23 | x 2 | src/kudu/gutilsrc/kudu/gutil | 1945:1972 (1%)2277:2304 (1%) | view | |
| 22 | x 2 | src/kudu/gutilsrc/kudu/gutil | 845:868 (<1%)1277:1300 (<1%) | view | |
| 22 | x 2 | src/kudu/gutilsrc/kudu/gutil | 1680:1706 (1%)1945:1971 (1%) | view | |
| 22 | x 2 | src/kudu/toolssrc/kudu/tools | 527:555 (1%)787:815 (1%) | view | |
| 22 | x 2 | cmake_modulescmake_modules | 1:22 (43%)1:22 (27%) | view | |
| 22 | x 2 | src/kudu/gutilsrc/kudu/gutil | 1680:1706 (1%)2277:2303 (1%) | view | |
| 22 | x 2 | src/kudu/toolssrc/kudu/tools | 696:726 (1%)1093:1123 (1%) | view | |
| 22 | x 2 | wwwwww | 38:61 (15%)32:55 (38%) | view | |
| 22 | x 2 | src/kudu/toolssrc/kudu/tools | 787:815 (1%)882:910 (1%) | view | |
| 22 | x 2 | src/kudu/toolssrc/kudu/tools | 787:815 (1%)988:1016 (1%) | view | |
| 22 | x 2 | src/kudu/gutilsrc/kudu/gutil | 1742:1763 (<1%)1788:1809 (<1%) | view |
Duplicated Units
The list of top 5 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 11 | x 2 | src/kudu/gutilsrc/kudu/gutil/auxiliary | 332:345 361:373 | view | |
| 11 | x 2 | src/kudu/gutilsrc/kudu/gutil/auxiliary | 349:362 258:271 | view | |
| 9 | x 2 | src/kudu/gutilsrc/kudu/gutil/auxiliary | 319:330 375:385 | view | |
| 7 | x 3 | src/kudu/consensussrc/kudu/consensussrc/kudu/consensus | 51:61 58:68 72:82 | view | |
| 7 | x 2 | src/kudu/gutilsrc/kudu/gutil/auxiliary | 364:372 273:281 | view |