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 포스팅은 WebtoB Server의 로드밸런싱 방식인 RR/FA 동작 방식에 대해 알아보겠습니다.


본 포스팅에서는 WebtoB Server 절의 RR/FA 방식에 대한 Schedule 동작 방식과 처리 시 발생될 수 있는 부하여부에 대한 내용을 담았습니다.



 

WebtoB RR/FA 방식 설명

Schedule 옵션 설명

(1) RR : Round Robin방식으로, Idle한 서버 프로세스에 요청을 할당합니다.

(2) FA : First Assign방식으로 우선순위(index)가 높고 Idle한 서버 프로세스에 요청을 할당합니다.

 

WebtoB RR/FA 방식에 따른 동작 방식 확인

a. jsv type 인 경우

servlet work thread webtob와 연결 되는 경우 webtob에 등록 된 순서대로 syslog에 확인이 가능합니다.

(spr_no가 할당되는 시점은 JEUS의 각 thread로부터 (tcp)connection이 맺어졌을 때 할당됨.)

그리고 등록시 jengineno라는 것을 부여 받게 됩니다.

Ex) 3개의 container webtob server에 연결

infrasvr_servlet_engine1 -> jengineno=0

infrasvr_servlet_engine3 -> jengineno=1

infrasvr_servlet_engine2 -> jengineno=2

  

- WEBTOB SYS LOG 확인 -

 

[2014/07/31:15:06:10] HTL-19967 I HTL0021: Successfully registered HTH. Start listening for this HTH. index=0, fd=5

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=33, tid=3, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=38, tid=8, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=37, tid=7, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=31, tid=1, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=35, tid=5, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=36, tid=6, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=39, tid=9, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=34, tid=4, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=32, tid=2, jengineno=0, jengineid=infrasvr_servlet_engine1, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=50, tid=0, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=57, tid=7, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=58, tid=8, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=59, tid=9, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=51, tid=1, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=52, tid=2, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=56, tid=6, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=53, tid=3, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=54, tid=4, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=44, tid=4, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=46, tid=6, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=49, tid=9, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=42, tid=2, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=40, tid=0, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=48, tid=8, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=43, tid=3, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=41, tid=1, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=47, tid=7, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=45, tid=5, jengineno=2, jengineid=infrasvr_servlet_engine2, remote ip=127.0.0.1

[2014/07/31:15:06:13] HTH-19968 I HTH0289: JSV server registered. svr=testGroup, svri=1, spri=55, tid=5, jengineno=1, jengineid=infrasvr_servlet_engine3, remote ip=127.0.0.1

 

RR 인 경우

RR이고, 위와 같이 register된 경우 jengineno를 기준으로 1->2  -> … 번호 -> 0 순서로 servlet engine을 선택하고 jengineno기준으로 먼저 register spri기준으로 스케쥴링. 위의 예에서는 요청이 들어오는 순서로  50 -> 44 -> 33 -> 57 -> 46 -> 38 -> 58 -> 46 -> 38 순서로 스케쥴링 됩니다

                         

FA 인 경우

RR이고, 위와 같이 register된 경우 jengineno를 기준으로 1->2->3->0 순서로 servlet engine을 선택하고, 요청을 받아서 busy 한 경우 가 아니라면 반복 됨. 요청이 들어오는 순서로  50 -> 44 -> 33 -> 57 -> 44 -> 33 -> 50 -> 44 -> 33  순서로 스케쥴링 됩니다. 57이 들어가있는 내용은 기존에 spri 50 번이 active 상태인 경우에 스케쥴 하게 됨.

 

b. html type 인 경우

 

wsadmin > st -p 로 확인 가능 (CacheEntry = 0 설정 후 확인)

jengineno -> spr_no 라고 생각하며, 동일한 방식 scheudule로 처리 됨.

 

RR 인 경우

[infrasvr:/user/mkko/webtob/config]$ wsadmin

--- Welcome to WebtoB Admin (Type "quit" to leave) ---

$$1 infrasvr (wsadm) [2014/07/31:17:04:51]: si

--------------------------------------------------------------------------------

 hth   svrname (svri)   status     count cqcnt    aqcnt qpcnt emcnt rscnt rbcnt

--------------------------------------------------------------------------------

   0  html       (  0)   RDY          20     0        0     0     0     0     0

   0  testGroup  (  1)   RDY           0     0        0     0     0     0     0

 

$$2 infrasvr (wsadm) [2014/07/31:17:04:52]: st -p html

 

HTH 0(25281): RDY

   ---------------------------------------------------------------------------

   svr_name   svgname    spr_no(pid)  status     count    avg(rt)  clid svc

   ---------------------------------------------------------------------------

   html       htmlg         0( 25284)   RDY         1   0.0003( 0)   -1 -

   html       htmlg         1( 25283)   RDY         1   0.0003( 0)   -1 -

   html       htmlg         2( 25288)   RDY         1   0.0004( 0)   -1 -

   html       htmlg         3( 25282)   RDY         1   0.0004( 0)   -1 -

   html       htmlg         4( 25307)   RDY         1   0.0003( 0)   -1 -

   html       htmlg         5( 25298)   RDY         1   0.0003( 0)   -1 -

   html       htmlg         6( 25292)   RDY         1   0.0003( 0)   -1 -

   html       htmlg         7( 25285)   RDY         1   0.0003( 0)   -1 -

   html       htmlg         8( 25308)   RDY         1   0.0003( 0)   -1 -

   html       htmlg         9( 25300)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        10( 25301)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        11( 25309)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        12( 25304)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        13( 25303)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        14( 25306)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        15( 25302)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        16( 25295)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        17( 25291)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        18( 25299)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        19( 25296)   RDY         1   0.0003( 0)   -1 -

   html       htmlg        20( 25305)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        21( 25290)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        22( 25311)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        23( 25310)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        24( 25293)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        25( 25297)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        26( 25287)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        27( 25294)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        28( 25286)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        29( 25289)   RDY         0   0.0000( 0)   -1 -

 

FA 인 경우

$$1 infrasvr (wsadm) [2014/07/31:17:02:43]: st -p html

 

HTH 0(20102): RDY

   ---------------------------------------------------------------------------

   svr_name   svgname    spr_no(pid)  status     count    avg(rt)  clid svc

   ---------------------------------------------------------------------------

   html       htmlg         0( 20127)   RDY        58   0.0002( 0)   -1 -

   html       htmlg         1( 20109)   RDY         0   0.0000( 0)   -1 -

   html       htmlg         2( 20108)   RDY         0   0.0000( 0)   -1 -

   html       htmlg         3( 20121)   RDY         0   0.0000( 0)   -1 -

   html       htmlg         4( 20118)   RDY         0   0.0000( 0)   -1 -

   html       htmlg         5( 20110)   RDY         0   0.0000( 0)   -1 -

   html       htmlg         6( 20113)   RDY         0   0.0000( 0)   -1 -

   html       htmlg         7( 20119)   RDY         0   0.0000( 0)   -1 -

   html       htmlg         8( 20114)   RDY         0   0.0000( 0)   -1 -

   html       htmlg         9( 20115)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        10( 20120)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        11( 20117)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        12( 20132)   RDY         0   0.0000( 0)   -1 -

   html       htmlg        13( 20112)   RDY         0   0.0000( 0)   -1 –

 . . . 생략 . . . 

 

 

WebtoB RR/FA 방식에 따른 부하 영향도 확인

FA, RR인 경우 처리 시간의 차이나 부하가 발생하는 내용수준은 아님. 다만 내부 code여서 trace로그로 남기더라도 log로 해당 logic이 처리되는 내용을 볼 수는 없지만 전체적인 처리 내용에 대한 로그를 확인 했을 때 처리시간의 차이는 없음으로  해당 logic 이 수행되는데 큰 부하는 없음을 알 수 있음.

 

jsv type인 경우

RR인경우

######### RR 인 경우 schedule= 0입니다 ########

[2014/07/31:14:37:32] HTH-17893 T tmax_msg.c:40 0: spr_schedule(0, 0xe4a278): svri=1, svrtype=16, schedule=0, starti=30, endi=89

[2014/07/31:14:37:32] HTH-17893 T tmax_msg.c:54 0: spr_schedule: clii=0, jengineno=-1

[2014/07/31:14:37:32] HTH-17893 T tmax_msg.c:199 0: spr_schedule--4: spri=38, grp_sprp=0xe82f50, sched_index=0

[2014/07/31:14:37:32] HTH-17893 T http_msg.c:526 0: http_request_msg--3: spr_schedule(clii=0, svri=1)=38

[2014/07/31:14:37:32] HTH-17893 T tmax_msg.c:376 0: make_spr_running: jsv server(1:38) qcount: 0(1)

[2014/07/31:14:37:32] HTH-17893 T http_jsv.c:275 0: transform_to_jsv_format: clii=0, msgtype=301

[2014/07/31:14:37:32] HTH-17893 T http_jsv.c:502 0: old jsv format: len=773, clen=0

 

 

FA 인 경우

######### FA 인 경우 schedule= 1입니다 ########

[2014/07/31:15:08:42] HTH-19968 T tmax_msg.c:40 0: spr_schedule(1, 0x1e59278): svri=1, svrtype=16, schedule=1, starti=30, endi=89

[2014/07/31:15:08:42] HTH-19968 T tmax_msg.c:54 0: spr_schedule: clii=1, jengineno=-1

[2014/07/31:15:08:42] HTH-19968 T tmax_msg.c:199 0: spr_schedule--4: spri=50, grp_sprp=0x1e91db0, sched_index=0

[2014/07/31:15:08:42] HTH-19968 T http_msg.c:526 0: http_request_msg--3: spr_schedule(clii=1, svri=1)=50

[2014/07/31:15:08:42] HTH-19968 T tmax_msg.c:376 0: make_spr_running: jsv server(1:50) qcount: 0(1)

[2014/07/31:15:08:42] HTH-19968 T http_jsv.c:275 0: transform_to_jsv_format: clii=1, msgtype=301

[2014/07/31:15:08:42] HTH-19968 T http_jsv.c:502 0: old jsv format: len=927, clen=0

 

  

html type인 경우

RR인 경우

######### RR 인 경우 schedule= 0입니다 ########

[2014/07/31:16:48:37] HTH-19174 T main.c:2163 0: msg from client: ind=0, msgtype=301, svcname=uri1, len=706

[2014/07/31:16:48:37] HTH-19174 T http_msg.c:249 0: http_request_msg--2: clii=0, svri=0, status=1, svgno=0

[2014/07/31:16:48:37] HTH-19174 T tmax_msg.c:40 0: spr_schedule(0, 0x1666210): svri=0, svrtype=1, schedule=0, starti=0, endi=29

[2014/07/31:16:48:37] HTH-19174 T tmax_msg.c:54 0: spr_schedule: clii=0, jengineno=-1

[2014/07/31:16:48:37] HTH-19174 T tmax_msg.c:231 0: spr_schedule--6: spri=17

[2014/07/31:16:48:37] HTH-19174 T http_msg.c:526 0: http_request_msg--3: spr_schedule(clii=0, svri=0)=17

[2014/07/31:16:48:37] HTH-19174 T tmax_msg.c:445 0: make_spr_running: cind[0], clid[0], seqno[105906178], svci.flags[0x0]

[2014/07/31:16:48:37] HTH-19174 T stat.c:28 0: update_spr_start: spri=17, svci=385, start_spri=0

[2014/07/31:16:48:37] HTH-19174 T main.c:1854 0: reply_to_server(17): spr.{fd=24, svri=0, status=2, cindex=0, whp=0x16a1090, wlength=0}

[2014/07/31:16:48:37] HTH-19174 T main.c:1888 0: msg to server: msgtype=301, svcname=uri1, len=706

[2014/07/31:16:48:37] HTH-19174 T svrio.c:433 0: write_to_svr_async(0x7ff7ed2aabc0): spr[17].{svri = 0, status = 2, wlength = 0}

[2014/07/31:16:48:37] HTH-19174 T svrio.c:487 0: write_to_svr_async--1: write(24, 0x16a1090, 802)=802: errno=0

[2014/07/31:16:48:37] HTH-19174 T main.c:1895 0: reply_to_server--1: write_to_svr_async(0x7ff7ed2aabc0)=2: errno=0

 

FA인 경우

######### FA 인 경우 schedule= 1입니다 ########

[2014/07/31:16:51:03] HTH-20102 T main.c:2163 0: msg from client: ind=0, msgtype=301, svcname=uri1, len=706

[2014/07/31:16:51:03] HTH-20102 T http_msg.c:249 0: http_request_msg--2: clii=0, svri=0, status=1, svgno=0

[2014/07/31:16:51:03] HTH-20102 T tmax_msg.c:40 0: spr_schedule(0, 0x1177210): svri=0, svrtype=1, schedule=1, starti=0, endi=29

[2014/07/31:16:51:03] HTH-20102 T tmax_msg.c:54 0: spr_schedule: clii=0, jengineno=-1

[2014/07/31:16:51:03] HTH-20102 T tmax_msg.c:231 0: spr_schedule--6: spri=0

[2014/07/31:16:51:03] HTH-20102 T http_msg.c:526 0: http_request_msg--3: spr_schedule(clii=0, svri=0)=0

[2014/07/31:16:51:03] HTH-20102 T tmax_msg.c:445 0: make_spr_running: cind[0], clid[0], seqno[910950402], svci.flags[0x0]

[2014/07/31:16:51:03] HTH-20102 T stat.c:28 0: update_spr_start: spri=0, svci=385, start_spri=0

[2014/07/31:16:51:03] HTH-20102 T main.c:1854 0: reply_to_server(0): spr.{fd=6, svri=0, status=2, cindex=0, whp=0x11b2090, wlength=0}

[2014/07/31:16:51:03] HTH-20102 T main.c:1888 0: msg to server: msgtype=301, svcname=uri1, len=706

[2014/07/31:16:51:03] HTH-20102 T svrio.c:433 0: write_to_svr_async(0x7fd0c623d010): spr[0].{svri = 0, status = 2, wlength = 0}

[2014/07/31:16:51:03] HTH-20102 T svrio.c:487 0: write_to_svr_async--1: write(6, 0x11b2090, 802)=802: errno=0

[2014/07/31:16:51:03] HTH-20102 T main.c:1895 0: reply_to_server--1: write_to_svr_async(0x7fd0c623d010)=2: errno=0

 

WebtoB의 기본 로드밸런싱 방식인 RR의 동작방식을 살펴보았으며, FA라는 새로운 방식도 살펴보았습니다.

물론 설정의 가중을 선택하는 건 운영자의 몫이 될거 같습니다.

고맙습니다.

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