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Background:

In reference to  MA-2678 - Getting issue details... STATUS ; we have changed forums implementation with following details (for reference; see PR#192):

  1. 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.
  2. To calculate 'read' status of a post, used 'last_acitvity_at' instead of 'updated_at'.
  3. 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})

Results:

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

 

Old Index

New Index

No. of clients = 48
req/s = 9.4
Methodsmedian response time95%99%

DELETE_comment

250

3101200

DELETE_thread

160

190200

GET_comment_list

150190310

GET_thread

140180220

GET_thread_list

160370520

PATCH_comment

2303601200

PATCH_thread

190240370

POST_comment_comment

290360430

POST_comment_response

250310450

POST_thread

160190200

auto_auth

200250250
No. of clients = 48
req/s = 8.9
Methodsmedian response time95%99%

DELETE_comment

250300480

DELETE_thread

170210230

GET_comment_list

150200320

GET_thread

150190280

GET_thread_list

170360520

PATCH_comment

220320410

PATCH_thread

180360330

POST_comment_comment

290340490

POST_comment_response

250300390

POST_thread

160200370

auto_auth

220230230


No. of clients = 96
req/s = 18.5
Methodsmedian response time95%99%
DELETE_comment

270

340390
DELETE_thread170230330
GET_comment_list170210330
GET_thread160200250
GET_thread_list190440610
PATCH_comment240330360
PATCH_thread200260350
POST_comment_comment310380470
POST_comment_response260330440
POST_thread170210340
auto_auth180220220


No. of clients = 96
req/s = 18.6
Methodsmedian response time95%99%
DELETE_comment270340360
DELETE_thread170220230
GET_comment_list160210340
GET_thread160200270
GET_thread_list190460600
PATCH_comment220310340
PATCH_thread190260350
POST_comment_comment300370480
POST_comment_response260330420
POST_thread170210340
auto_auth180230230


No. of clients = 162
req/s = 31
Methodsmedian response time95%99%

DELETE_comment

320400490

DELETE_thread

190240280

GET_comment_list

190250370

GET_thread

190250340

GET_thread_list

220520660

PATCH_comment

270360390

PATCH_thread

230310370

POST_comment_comment

350450540

POST_comment_response

300400490

POST_thread

190240340

auto_auth

200200200


No. of clients = 162
req/s = 31.6
Methodsmedian response time95%99%

DELETE_comment

310410590

DELETE_thread

190240250

GET_comment_list

190250380

GET_thread

180250360

GET_thread_list

220530670

PATCH_comment

2603801400

PATCH_thread

220280400

POST_comment_comment

340450540

POST_comment_response

290400510

POST_thread

190240370

auto_auth

210220220


No. of clients = 240
req/s = 44.6
Methodsmedian response time95%99%

DELETE_comment

400600700

DELETE_thread

240320530

GET_comment_list

240350480

GET_thread

240360470

GET_thread_list

270630800

PATCH_comment

330510600

PATCH_thread

290420530

POST_comment_comment

420640820

POST_comment_response

360560730

POST_thread

240310440

auto_auth

210210210


No. of clients = 240
req/s = 45.40
Methodsmedian response time95%99%

DELETE_comment

3906501300

DELETE_thread

240370430

GET_comment_list

230350500

GET_thread

230370600

GET_thread_list

270640850

PATCH_comment

3004901200

PATCH_thread

280460640

POST_comment_comment

4106701000

POST_comment_response

360560860

POST_thread

230300500

auto_auth

190220220


No. of clients = 336
req/s = 53
Methodsmedian response time95%99%

DELETE_comment

250055006500

DELETE_thread

98023002900

GET_comment_list

80021002700

GET_thread

92027003300

GET_thread_list

85024003300

PATCH_comment

150039005000

PATCH_thread

120034004100

POST_comment_comment

230054007000

POST_comment_response

170044005900

POST_thread

74020002700

auto_auth

33013001300


No. of clients = 336
1. req/s = 54.3
2. req/s = 40.2
Methodsmedian response timemedian response time95%95%99%99%

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 


No. of clients = 460
req/s = 44.5
Methodsmedian response time95%99%

DELETE_comment

5600980012000

DELETE_thread

370062007900

GET_comment_list

370061008100

GET_thread

5200980013000

GET_thread_list

370068008600

PATCH_comment

480079009500

PATCH_thread

460073009900

POST_comment_comment

5500930011000

POST_comment_response

5000830010000

POST_thread

350060009200

auto_auth

200026002600


No. of clients = 460
req/s = 49.1
Methodsmedian response time95%99%

DELETE_comment

61001000011000

DELETE_thread

350057006400

GET_comment_list

300050005700

GET_thread

420071008700

GET_thread_list

310053006200

PATCH_comment

440078008600

PATCH_thread

410069007600

POST_comment_comment

5700990011000

POST_comment_response

4800850010000

POST_thread

300048005500

auto_auth

170027002700


No. of clients = 510
req/s = 32.4
Methodsmedian response time95%99%

DELETE_comment

77001500027000

DELETE_thread

54001200015000

GET_comment_list

63001400031000

GET_thread

86001900036000

GET_thread_list

64001400032000

PATCH_comment

70001400025000

PATCH_thread

69001600035000

POST_comment_comment

74001500036000

POST_comment_response

70001400026000

POST_thread

60001100032000

auto_auth

290040004400


No. of clients = 510
req/s = 33.9
Methodsmedian response time95%99%

DELETE_comment

76001400019000

DELETE_thread

67001100014000

GET_comment_list

67001100016000

GET_thread

94001600022000

GET_thread_list

70001100017000

PATCH_comment

69001200016000

PATCH_thread

69001200021000

POST_comment_comment

76001400019000

POST_comment_response

72001300018000

POST_thread

67001100015000

auto_auth

240032003300


No. of clients = 578
req/s = 26.70
Methodsmedian response time95%99%

DELETE_comment

95002600032000

DELETE_thread

87002500032000

GET_comment_list

86002200031000

GET_thread

130002700040000

GET_thread_list

86002200032000

PATCH_comment

88002200032000

PATCH_thread

88002000029000

POST_comment_comment

92002400031000

OST_comment_response

93002400032000

POST_thread

83002000032000

auto_auth

360052005500


No. of clients = 578
req/s = 40.2
Methodsmedian response time95%99%

DELETE_comment

91002400032000

DELETE_thread

85002200026000

GET_comment_list

81002200032000

GET_thread

120002600040000

GET_thread_list

83002200032000

PATCH_comment

83002300031000

PATCH_thread

80002300028000

POST_comment_comment

90002400032000

OST_comment_response

85002300032000

POST_thread

83002200032000

auto_auth

410051005400


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