Cant do _resync while db is offline

[thezluf]

after chnaging sync gateway to the latest version i have tried to do _resync and got this error “503 Database must be _offline before calling /_resync”

I took the db offline using _offline command and got time out
running the command again resulted in 200 OK
but _resync didn’t work

I have attached the logs

LOGS:
11:47:52.748641 2016-02-25T11:47:52.748Z HTTP: #5690: POST /db/_resync (ADMIN)
11:47:52.748703 2016-02-25T11:47:52.748Z HTTP: #5690: --> 503 Database must be _offline before calling /_resync (0.1 ms)
11:47:55.155120 2016-02-25T11:47:55.155Z HTTP: #5691: POST /db/_offline (ADMIN)
11:47:55.155146 2016-02-25T11:47:55.155Z CRUD: Taking Database : db, offline
11:47:55.155163 2016-02-25T11:47:55.155Z HTTP+: #5691: --> 200 (0.1 ms)
11:47:58.286254 2016-02-25T11:47:58.286Z HTTP: #5692: POST /db/_resync (ADMIN)
11:47:58.286316 2016-02-25T11:47:58.286Z HTTP: #5692: --> 503 Database must be _offline before calling /_resync (0.1 ms)
11:48:06.108094 2016-02-25T11:48:06.108Z HTTP: #5693: POST /db/_resync (ADMIN)
11:48:06.108155 2016-02-25T11:48:06.108Z HTTP: #5693: --> 503 Database must be _offline before calling /_resync (0.1 ms)
11:48:08.859966 2016-02-25T11:48:08.859Z HTTP: #5694: POST /db/_offline (ADMIN)
11:48:08.859993 2016-02-25T11:48:08.859Z CRUD: Taking Database : db, offline
11:48:08.860011 2016-02-25T11:48:08.860Z HTTP+: #5694: --> 200 (0.1 ms)
11:48:18.621788 2016-02-25T11:48:18.621Z HTTP: #5695: POST /db/_online (ADMIN)
11:48:18.621836 2016-02-25T11:48:18.621Z CRUD: Taking Database : db, online in 0 seconds
11:48:18.621867 2016-02-25T11:48:18.621Z HTTP+: #5695: --> 200 (0.2 ms)
11:48:23.757153 2016-02-25T11:48:23.757Z HTTP: #5696: POST /db/_resync (ADMIN)
11:48:23.757213 2016-02-25T11:48:23.757Z HTTP: #5696: --> 503 Database must be _offline before calling /_resync (0.1 ms)
11:48:31.989631 2016-02-25T11:48:31.989Z HTTP: #5697: POST /db/_offline (ADMIN)
11:48:31.989658 2016-02-25T11:48:31.989Z CRUD: Taking Database : db, offline
11:48:31.989675 2016-02-25T11:48:31.989Z HTTP+: #5697: --> 200 (0.1 ms)
11:48:34.758439 2016-02-25T11:48:34.758Z HTTP: #5698: POST /db/_resync (ADMIN)
11:48:34.758512 2016-02-25T11:48:34.758Z HTTP: #5698: --> 503 Database must be _offline before calling /_resync (0.1 ms)
11:48:40.214986 2016-02-25T11:48:40.214Z HTTP: #5699: POST /db/_online (ADMIN)
11:48:40.215020 2016-02-25T11:48:40.215Z CRUD: Taking Database : db, online in 0 seconds
11:48:40.215051 2016-02-25T11:48:40.215Z HTTP+: #5699: --> 200 (0.1 ms)

[andy]

@thezluf

The log provided shows each _resync request returning with a 503 status, does the log align with the failure scenario you describe?

Can you run the following curl command and paste the results here:

curl -X GET http://host:4985/_expvar

If you look at the stat “syncGateway_rest”, if there are no other active users on Sync Gateway, “requests_active” should be ‘1’ (your _expvar request). If there are other blocked requests then this number will be greater.

e.g. for an SG instance with no active users:

"syncGateway_rest": {"requests_0000ms": 3, "requests_active": 1, "requests_total": 2}

[thezluf]

@andy

curl -X GET http://host:4985/_expvar

look completely different tough I have restarted sync gateway since then

{
“cb”: {“ops”: {“GetsRaw”: {“count”:3282,“sum”:549217303,“min”:52362,“max”:12040202,“mean”:167342.26173065204,“p25”:103239,“p50”:128232,“p75”:151749,“p90”:174871,“p99”:1821339}, “Incr”: {“count”:25,“sum”:29666851,“min”:165230,“max”:5443458,“mean”:1.18667404e+06,“p25”:262391,“p50”:554787,“p75”:1825160,“p90”:3255511,“p99”:5443458}, “Write(0x0)”: {“count”:7,“sum”:11469507,“min”:230574,“max”:5973724,“mean”:1.638501e+06,“p25”:256800,“p50”:938127,“p75”:2352845,“p90”:5973724,“p99”:5973724}, “Write(raw)”: {“count”:13,“sum”:7873853,“min”:161537,“max”:1232528,“mean”:605681,“p25”:232299,“p50”:375627,“p75”:1112096,“p90”:1217682,“p99”:1232528}, “casNext”: {“count”:848,“sum”:132489013,“min”:49681,“max”:5787112,“mean”:156237.04363207548,“p25”:83130,“p50”:92355,“p75”:111359,“p90”:170090,“p99”:2037860}}, “pools”: {“127.0.0.1:11210”: {“count”:4176,“sum”:21054754,“min”:588,“max”:4502301,“mean”:5041.847222222223,“p25”:803,“p50”:1159,“p75”:2475,“p90”:2713,“p99”:10885}}},
“cmdline”: [“/opt/couchbase-sync-gateway/bin/sync_gateway”,“-logFilePath=/home/sync_gateway/logs/spartkup.log”,“/home/ubuntu/sync_function/basic-sync-function-sparkup.json”],
“goroutine_stats”: {“HighWaterMark”:36,“Snapshots”:[36]}
,
“mc”: {“recv”: {“bytes”:{“ADD”:288,“GET”:30704302,“INCREMENT”:800,“SASL_AUTH”:72,“SASL_LIST_MECHS”:114,“SET”:833,“total”:30706409},“errs”:{},“ops”:{“ADD”:12,“GET”:4104,“INCREMENT”:25,“SASL_AUTH”:3,“SASL_LIST_MECHS”:3,“SET”:34,“total”:4181}}, “tap”: {“bytes”:{“NOOP”:2664,“TAP_DELETE”:1464,“TAP_MUTATION”:43960,“total”:48088},“errs”:{},“ops”:{“NOOP”:111,“TAP_DELETE”:11,“TAP_MUTATION”:68,“total”:190}}, “xmit”: {“bytes”:{“ADD”:11648,“GET”:259624,“INCREMENT”:1325,“SASL_AUTH”:114,“SASL_LIST_MECHS”:72,“SET”:30338,“TAP_CONNECT”:36,“total”:303157},“errs”:{},“ops”:{“ADD”:12,“GET”:4104,“INCREMENT”:25,“SASL_AUTH”:3,“SASL_LIST_MECHS”:3,“SET”:34,“TAP_CONNECT”:1,“total”:4182}}},
“memstats”: 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:1400,“Frees”:1313},{“Size”:4608,“Mallocs”:556,“Frees”:534},{“Size”:5376,“Mallocs”:215,“Frees”:205},{“Size”:6144,“Mallocs”:1081,“Frees”:1018},{“Size”:6400,“Mallocs”:76,“Frees”:73},{“Size”:6656,“Mallocs”:31,“Frees”:30},{“Size”:6912,“Mallocs”:37,“Frees”:36},{“Size”:8192,“Mallocs”:403,“Frees”:390},{“Size”:8448,“Mallocs”:9,“Frees”:7},{“Size”:8704,“Mallocs”:33,“Frees”:33},{“Size”:9472,“Mallocs”:126,“Frees”:126},{“Size”:10496,“Mallocs”:37,“Frees”:36},{“Size”:12288,“Mallocs”:136,“Frees”:130},{“Size”:13568,“Mallocs”:103,“Frees”:103},{“Size”:14080,“Mallocs”:24,“Frees”:23},{“Size”:16384,“Mallocs”:159,“Frees”:156},{“Size”:16640,“Mallocs”:12,“Frees”:12},{“Size”:17664,“Mallocs”:71,“Frees”:69}]},
“syncGateway_changeCache”: {“lag-queue-0000ms”: 25, “lag-tap-0100ms”: 1, “lag-tap-0200ms”: 2, “lag-tap-0400ms”: 4, “lag-tap-0600ms”: 1, “lag-tap-0700ms”: 2, “lag-tap-0800ms”: 2, “lag-tap-1500ms”: 1, “lag-tap-1600ms”: 3, “lag-tap-1700ms”: 2, “lag-tap-1800ms”: 1, “lag-tap-2600ms”: 1, “lag-tap-3200ms”: 1, “lag-tap-3400ms”: 1, “lag-tap-4000ms”: 1, “lag-tap-5200ms”: 2, “lag-total-0100ms”: 1, “lag-total-0200ms”: 2, “lag-total-0400ms”: 4, “lag-total-0600ms”: 1, “lag-total-0700ms”: 2, “lag-total-0800ms”: 2, “lag-total-1500ms”: 1, “lag-total-1600ms”: 3, “lag-total-1700ms”: 2, “lag-total-1800ms”: 1, “lag-total-2600ms”: 1, “lag-total-3200ms”: 1, “lag-total-3400ms”: 1, “lag-total-4000ms”: 1, “lag-total-5200ms”: 2, “maxPending”: 1, “view_queries”: 60},
“syncGateway_db”: {“channelChangesFeeds”: 315, “document_gets”: 1530, “revisionCache_adds”: 25, “revisionCache_hits”: 7568, “revisionCache_misses”: 1506, “revs_added”: 25, “sequence_gets”: 1, “sequence_reserves”: 24},
“syncGateway_gocb”: {},
“syncGateway_httpListener”: {“max_active”: 0, “max_wait”: 0},
“syncGateway_index”: {“latest_write_batch”: 0},
“syncGateway_index_clocks”: {},
“syncGateway_rest”: {“changesFeeds_active”: 1, “changesFeeds_total”: 86, “requests_0000ms”: 216, “requests_0100ms”: 3, “requests_0200ms”: 78, “requests_0300ms”: 172, “requests_0400ms”: 42, “requests_0500ms”: 17, “requests_0600ms”: 5, “requests_0700ms”: 1, “requests_0800ms”: 1, “requests_0900ms”: 6, “requests_1000ms”: 6, “requests_10700ms”: 1, “requests_1100ms”: 2, “requests_1200ms”: 4, “requests_1300ms”: 3, “requests_13400ms”: 1, “requests_1400ms”: 1, “requests_1500ms”: 5, “requests_1600ms”: 2, “requests_17000ms”: 1, “requests_1800ms”: 2, “requests_19200ms”: 1, “requests_2200ms”: 1, “requests_22300ms”: 2, “requests_2300ms”: 2, “requests_23300ms”: 1, “requests_2400ms”: 2, “requests_2500ms”: 1, “requests_25900ms”: 1, “requests_2700ms”: 2, “requests_3000ms”: 1, “requests_3100ms”: 1, “requests_31900ms”: 1, “requests_34400ms”: 1, “requests_3600ms”: 1, “requests_3800ms”: 1, “requests_3900ms”: 4, “requests_40000ms”: 1, “requests_4000ms”: 2, “requests_42200ms”: 1, “requests_4300ms”: 1, “requests_49700ms”: 1, “requests_5500ms”: 2, “requests_55700ms”: 1, “requests_56700ms”: 1, “requests_64000ms”: 1, “requests_8200ms”: 1, “requests_8400ms”: 1, “requests_active”: 2, “requests_total”: 692}
}

[andy]

@thezluf

This shows “requests_active”: 2, but there is also a “changesFeeds_active”: 1. If you could run the curl command a few times over 10-30 minutes it would be useful to know if “requests_active” property fluctuates between 1 and >1 or stays at two, could you also note the value of “changesFeeds_active” for each call.

Your original issue could be related to ticket #1527, where a normal REST API call has blocked and this prevents the _offline REST API call from returning. If you experience the blocking _offline call again, it would be great if you can kill the Sync Gateway process with a SIGQUIT and post the stack trace to that ticket.

sudo kill -3 <sync_gateway_pid>

[thezluf]

I have another problem now while still not being able to take the sync gateway offline or running resync

,{“Size”:1664,“Mallocs”:26,“Frees”:16},{“Size”:2048,“Mallocs”:196,“Frees”:55},{“Size”:2304,“Mallocs”:2477,“Frees”:99},{“Size”:2560,“Mallocs”:22,“Frees”:13},{“Size”:2816,“Mallocs”:11,“Frees”:8},{“Size”:3072,“Mallocs”:6,“Frees”:3},{“Size”:3328,“Mallocs”:12,“Frees”:5},{“Size”:4096,“Mallocs”:178,“Frees”:39},{“Size”:4608,“Mallocs”:0,“Frees”:0},{“Size”:5376,“Mallocs”:25,“Frees”:13},{“Size”:6144,“Mallocs”:15,“Frees”:5},{“Size”:6400,“Mallocs”:3,“Frees”:0},{“Size”:6656,“Mallocs”:1,“Frees”:0},{“Size”:6912,“Mallocs”:0,“Frees”:0},{“Size”:8192,“Mallocs”:33,“Frees”:28},{“Size”:8448,“Mallocs”:0,“Frees”:0},{“Size”:8704,“Mallocs”:0,“Frees”:0},{“Size”:9472,“Mallocs”:4,“Frees”:2},{“Size”:10496,“Mallocs”:1,“Frees”:0},{“Size”:12288,“Mallocs”:6,“Frees”:6},{“Size”:13568,“Mallocs”:4,“Frees”:2},{“Size”:14080,“Mallocs”:4,“Frees”:2},{“Size”:16384,“Mallocs”:8,“Frees”:4},{“Size”:16640,“Mallocs”:0,“Frees”:0},{“Size”:17664,“Mallocs”:6,“Frees”:6}]},
“syncGateway_changeCache”: {“maxPending”: 0, “view_queries”: 4},
“syncGateway_db”: {“channelChangesFeeds”: 177, “document_gets”: 5, “revisionCache_hits”: 3, “revisionCache_misses”: 1, “sequence_gets”: 1, “sequence_reserves”: 1},
“syncGateway_gocb”: {},
“syncGateway_httpListener”: {“max_active”: 0, “max_wait”: 0},
“syncGateway_index”: {“latest_write_batch”: 0},
“syncGateway_index_clocks”: {},
“syncGateway_rest”: {“changesFeeds_active”: 55, “changesFeeds_total”: 59, “requests_0000ms”: 4, “requests_active”: 56, “requests_total”: 64}
}