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In reference to
MA-2678
-
Getting issue details...
STATUS
; we have changed forums implementation with following details (for reference; see PR#192):
- Changed post/response/comment behaviour to update post's 'last_activity_at' only at time of creation of post and creation of response/comment on a post. Previously post's 'last_activity_at' was being updated for both creation and update.
- To calculate 'read' status of a post, used 'last_acitvity_at' instead of 'updated_at'.
- To calculate 'unread comment count' for a post, used 'created_at' instead of 'updated_at'.
'unread comment count' was being calculate as:
unread_comment_count = Comment.collection.find(:comment_thread_id => t._id, :author_id => {"$ne" => user.id}, :updated_at => {"$gte" => read_dates[thread_key]}).count
and had a compound index against it
index({_type: 1, comment_thread_id: 1, author_id: 1, updated_at: 1})
With new implementation:
unread_comment_count = Comment.collection.find(:comment_thread_id => t._id, :author_id => {"$ne" => user.id}, :created_at => {"$gte" => read_dates[thread_key]}).count
So, we removed index
index({_type: 1, comment_thread_id: 1, author_id: 1, updated_at: 1})
and added a new one
index({comment_thread_id: 1, author_id: 1, created_at: 1})
The load tests were run on 4x c4.2xlarge instances.
The results of load tests below show differences between the old and new implementation. The two set of results looks quite similar except when it reaches "No. of clients = 336"; where there is huge difference between old and new percentiles as well as sudden rise in percentile for both old and new index with respect to "No. of clients = 224". For all the next tests (i.e. No. of clients = 460, No. of clients = 510, No. of clients = 578), the difference between old and new percentile is minimised and the new index results have lower percentile for most of the endpoints.
I have captured new relic charts too; permaLink_old_index with average rpm = 1.86k and permaLink_new_index with average rpm = 1.81k
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No. of clients = 48 req/s = 9.4 | Methods | median response time | 95% | 99% |
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DELETE_comment | 250 | 310 | 1200 | DELETE_thread | 160 | 190 | 200 | GET_comment_list | 150 | 190 | 310 | GET_thread | 140 | 180 | 220 | GET_thread_list | 160 | 370 | 520 | PATCH_comment | 230 | 360 | 1200 | PATCH_thread | 190 | 240 | 370 | POST_comment_comment | 290 | 360 | 430 | POST_comment_response | 250 | 310 | 450 | POST_thread | 160 | 190 | 200 | auto_auth | 200 | 250 | 250 |
| No. of clients = 48 req/s = 8.9 | Methods | median response time | 95% | 99% |
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DELETE_comment | 250 | 300 | 480 | DELETE_thread | 170 | 210 | 230 | GET_comment_list | 150 | 200 | 320 | GET_thread | 150 | 190 | 280 | GET_thread_list | 170 | 360 | 520 | PATCH_comment | 220 | 320 | 410 | PATCH_thread | 180 | 360 | 330 | POST_comment_comment | 290 | 340 | 490 | POST_comment_response | 250 | 300 | 390 | POST_thread | 160 | 200 | 370 | auto_auth | 220 | 230 | 230 |
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No. of clients = 96 req/s = 18.5 | Methods | median response time | 95% | 99% |
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| DELETE_comment | 270 | 340 | 390 | | DELETE_thread | 170 | 230 | 330 | | GET_comment_list | 170 | 210 | 330 | | GET_thread | 160 | 200 | 250 | | GET_thread_list | 190 | 440 | 610 | | PATCH_comment | 240 | 330 | 360 | | PATCH_thread | 200 | 260 | 350 | | POST_comment_comment | 310 | 380 | 470 | | POST_comment_response | 260 | 330 | 440 | | POST_thread | 170 | 210 | 340 | | auto_auth | 180 | 220 | 220 |
| No. of clients = 96 req/s = 18.6 | Methods | median response time | 95% | 99% |
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| DELETE_comment | 270 | 340 | 360 | | DELETE_thread | 170 | 220 | 230 | | GET_comment_list | 160 | 210 | 340 | | GET_thread | 160 | 200 | 270 | | GET_thread_list | 190 | 460 | 600 | | PATCH_comment | 220 | 310 | 340 | | PATCH_thread | 190 | 260 | 350 | | POST_comment_comment | 300 | 370 | 480 | | POST_comment_response | 260 | 330 | 420 | | POST_thread | 170 | 210 | 340 | | auto_auth | 180 | 230 | 230 |
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No. of clients = 162 req/s = 31 | Methods | median response time | 95% | 99% |
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DELETE_comment | 320 | 400 | 490 | DELETE_thread | 190 | 240 | 280 | GET_comment_list | 190 | 250 | 370 | GET_thread | 190 | 250 | 340 | GET_thread_list | 220 | 520 | 660 | PATCH_comment | 270 | 360 | 390 | PATCH_thread | 230 | 310 | 370 | POST_comment_comment | 350 | 450 | 540 | POST_comment_response | 300 | 400 | 490 | POST_thread | 190 | 240 | 340 | auto_auth | 200 | 200 | 200 |
| No. of clients = 162 req/s = 31.6 | Methods | median response time | 95% | 99% |
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DELETE_comment | 310 | 410 | 590 | DELETE_thread | 190 | 240 | 250 | GET_comment_list | 190 | 250 | 380 | GET_thread | 180 | 250 | 360 | GET_thread_list | 220 | 530 | 670 | PATCH_comment | 260 | 380 | 1400 | PATCH_thread | 220 | 280 | 400 | POST_comment_comment | 340 | 450 | 540 | POST_comment_response | 290 | 400 | 510 | POST_thread | 190 | 240 | 370 | auto_auth | 210 | 220 | 220 |
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No. of clients = 240 req/s = 44.6 | Methods | median response time | 95% | 99% |
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DELETE_comment | 400 | 600 | 700 | DELETE_thread | 240 | 320 | 530 | GET_comment_list | 240 | 350 | 480 | GET_thread | 240 | 360 | 470 | GET_thread_list | 270 | 630 | 800 | PATCH_comment | 330 | 510 | 600 | PATCH_thread | 290 | 420 | 530 | POST_comment_comment | 420 | 640 | 820 | POST_comment_response | 360 | 560 | 730 | POST_thread | 240 | 310 | 440 | auto_auth | 210 | 210 | 210 |
| No. of clients = 240 req/s = 45.40 | Methods | median response time | 95% | 99% |
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DELETE_comment | 390 | 650 | 1300 | DELETE_thread | 240 | 370 | 430 | GET_comment_list | 230 | 350 | 500 | GET_thread | 230 | 370 | 600 | GET_thread_list | 270 | 640 | 850 | PATCH_comment | 300 | 490 | 1200 | PATCH_thread | 280 | 460 | 640 | POST_comment_comment | 410 | 670 | 1000 | POST_comment_response | 360 | 560 | 860 | POST_thread | 230 | 300 | 500 | auto_auth | 190 | 220 | 220 |
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No. of clients = 336 req/s = 53 | Methods | median response time | 95% | 99% |
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DELETE_comment | 2500 | 5500 | 6500 | DELETE_thread | 980 | 2300 | 2900 | GET_comment_list | 800 | 2100 | 2700 | GET_thread | 920 | 2700 | 3300 | GET_thread_list | 850 | 2400 | 3300 | PATCH_comment | 1500 | 3900 | 5000 | PATCH_thread | 1200 | 3400 | 4100 | POST_comment_comment | 2300 | 5400 | 7000 | POST_comment_response | 1700 | 4400 | 5900 | POST_thread | 740 | 2000 | 2700 | auto_auth | 330 | 1300 | 1300 |
| No. of clients = 336 req/s = 54.3 | Methods | median response time | 95% | 99% |
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DELETE_comment | 1500 | 9200 | 12000 | DELETE_thread | 470 | 4100 | 6700 | GET_comment_list | 510 | 5000 | 6800 | GET_thread | 590 | 6500 | 9900 | GET_thread_list | 580 | 4900 | 6800 | PATCH_comment | 810 | 7600 | 1100 | PATCH_thread | 790 | 5400 | 7800 | POST_comment_comment | 1300 | 9300 | 12000 | POST_comment_response | 1000 | 7700 | 10000 | POST_thread | 470 | 4600 | 6400 | auto_auth | 320 | 320 | 320 |
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No. of clients = 460 req/s = 44.5 | Methods | median response time | 95% | 99% |
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DELETE_comment | 5600 | 9800 | 12000 | DELETE_thread | 3700 | 6200 | 7900 | GET_comment_list | 3700 | 6100 | 8100 | GET_thread | 5200 | 9800 | 13000 | GET_thread_list | 3700 | 6800 | 8600 | PATCH_comment | 4800 | 7900 | 9500 | PATCH_thread | 4600 | 7300 | 9900 | POST_comment_comment | 5500 | 9300 | 11000 | POST_comment_response | 5000 | 8300 | 10000 | POST_thread | 3500 | 6000 | 9200 | auto_auth | 2000 | 2600 | 2600 |
| No. of clients = 460 req/s = 49.1 | Methods | median response time | 95% | 99% |
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DELETE_comment | 6100 | 10000 | 11000 | DELETE_thread | 3500 | 5700 | 6400 | GET_comment_list | 3000 | 5000 | 5700 | GET_thread | 4200 | 7100 | 8700 | GET_thread_list | 3100 | 5300 | 6200 | PATCH_comment | 4400 | 7800 | 8600 | PATCH_thread | 4100 | 6900 | 7600 | POST_comment_comment | 5700 | 9900 | 11000 | POST_comment_response | 4800 | 8500 | 10000 | POST_thread | 3000 | 4800 | 5500 | auto_auth | 1700 | 2700 | 2700 |
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No. of clients = 510 req/s = 32.4 | Methods | median response time | 95% | 99% |
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DELETE_comment | 7700 | 15000 | 27000 | DELETE_thread | 5400 | 12000 | 15000 | GET_comment_list | 6300 | 14000 | 31000 | GET_thread | 8600 | 19000 | 36000 | GET_thread_list | 6400 | 14000 | 32000 | PATCH_comment | 7000 | 14000 | 25000 | PATCH_thread | 6900 | 16000 | 35000 | POST_comment_comment | 7400 | 15000 | 36000 | POST_comment_response | 7000 | 14000 | 26000 | POST_thread | 6000 | 11000 | 32000 | auto_auth | 2900 | 4000 | 4400 |
| No. of clients = 510 req/s = 33.9 | Methods | median response time | 95% | 99% |
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DELETE_comment | 7600 | 14000 | 19000 | DELETE_thread | 6700 | 11000 | 14000 | GET_comment_list | 6700 | 11000 | 16000 | GET_thread | 9400 | 16000 | 22000 | GET_thread_list | 7000 | 11000 | 17000 | PATCH_comment | 6900 | 12000 | 16000 | PATCH_thread | 6900 | 12000 | 21000 | POST_comment_comment | 7600 | 14000 | 19000 | POST_comment_response | 7200 | 13000 | 18000 | POST_thread | 6700 | 11000 | 15000 | auto_auth | 2400 | 3200 | 3300 |
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No. of clients = 578 req/s = 26.70 | Methods | median response time | 95% | 99% |
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DELETE_comment | 9500 | 26000 | 32000 | DELETE_thread | 8700 | 25000 | 32000 | GET_comment_list | 8600 | 22000 | 31000 | GET_thread | 13000 | 27000 | 40000 | GET_thread_list | 8600 | 22000 | 32000 | PATCH_comment | 8800 | 22000 | 32000 | PATCH_thread | 8800 | 20000 | 29000 | POST_comment_comment | 9200 | 24000 | 31000 | OST_comment_response | 9300 | 24000 | 32000 | POST_thread | 8300 | 20000 | 32000 | auto_auth | 3600 | 5200 | 5500 |
| No. of clients = 578 req/s = 40.2 | Methods | median response time | 95% | 99% |
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DELETE_comment | 9100 | 24000 | 32000 | DELETE_thread | 8500 | 22000 | 26000 | GET_comment_list | 8100 | 22000 | 32000 | GET_thread | 12000 | 26000 | 40000 | GET_thread_list | 8300 | 22000 | 32000 | PATCH_comment | 8300 | 23000 | 31000 | PATCH_thread | 8000 | 23000 | 28000 | POST_comment_comment | 9000 | 24000 | 32000 | OST_comment_response | 8500 | 23000 | 32000 | POST_thread | 8300 | 22000 | 32000 | auto_auth | 4100 | 5100 | 5400 |
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