Monitoring MongoDB (MongoSV)

MongoDB Health Tips(How to spot a landslide)

It’s a little different,but not entirely new.

Keep it in RAM. Obviously.www.ﬂickr.com/photos/comedynose/4388430444/

How do you know? > db.stats() { ! "collections" : 3, ! "objects" : 379970142, ! "avgObjSize" : 146.4554114991488, ! "dataSize" : 55648683504, 51GB ! "storageSize" : 61795435008, ! "numExtents" : 64, ! "indexes" : 1, ! "indexSize" : 21354514128, 19GB ! "fileSize" : 100816388096, ! "ok" : 1 }http://www.ﬂickr.com/photos/comedynose/4388430444/

Where should it go? Should it be in What? memory? Indexes Always Data If you canhttp://www.ﬂickr.com/photos/comedynose/4388430444/

How you’ll know1) Slow queries Thu Oct 14 17:01:11 [conn7410] update sd.apiLog query: { c: "android/setDeviceToken", a: 1466, u: "blah", ua: "Server Density Android" } 51926mswww.ﬂickr.com/photos/tonivc/2283676770/

How you’ll know2) Timeouts cursor timed out (20000 ms)

How you’ll know3) Disk i/o spikeswww.ﬂickr.com/photos/daddo83/3406962115/

Watch your storage1) Pre-alloc

Watch your storage2) Sharding maxSize

Watch your storage3) Logging --quiet db.runCommand("logRotate"); killall -SIGUSR1 mongod

db.serverStatus()

db.serverStatus()1) Used connectionswww.ﬂickr.com/photos/armchaircaver/2061231069/

db.serverStatus()2) Available connections

Fri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [mongosMain] Listener: accept() returns -1 errno:24 Too many open filesFri Nov 19 17:24:32 [conn2335] getaddrinfo("rs1b") failed: No address associated with hostnameFri Nov 19 17:24:32 [conn2335] getaddrinfo("rs1d") failed: No address associated with hostnameFri Nov 19 17:24:32 [conn2335] getaddrinfo("rs1c") failed: No address associated with hostnameFri Nov 19 17:24:32 [conn2335] getaddrinfo("rs2b") failed: No address associated with hostnameFri Nov 19 17:24:32 [conn2335] getaddrinfo("rs2d") failed: No address associated with hostnameFri Nov 19 17:24:32 [conn2335] getaddrinfo("rs2c") failed: No address associated with hostnameFri Nov 19 17:24:32 [conn2335] getaddrinfo("rs2a") failed: No address associated with hostnameFri Nov 19 17:24:32 [conn2268] checkmaster: rs2b:27018 { setName: "set2", ismaster: false, secondary: true, hosts: [ "rs2b:27018", "rs2d:27018", "rs2c:27018", "rs2a:27018" ], arbiters:[ "rs2arbiter:27018" ], primary: "rs2a:27018", maxBsonObjectSize: 8388608, ok: 1.0 }MessagingPort say send() errno:9 Bad file descriptor (NONE)Fri Nov 19 17:24:32 [conn2268] checkmaster: caught exception rs2d:27018 socket exceptionFri Nov 19 17:24:32 [conn2268] MessagingPort say send() errno:9 Bad file descriptor (NONE)Fri Nov 19 17:24:32 [conn2268] checkmaster: caught exception rs2c:27018 socket exceptionFri Nov 19 17:24:32 [conn2268] MessagingPort say send() errno:9 Bad file descriptor (NONE)Fri Nov 19 17:24:32 [conn2268] checkmaster: caught exception rs2a:27018 socket exceptionFri Nov 19 17:24:33 [conn2330] getaddrinfo("rs1a") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2330] getaddrinfo("rs1b") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2330] getaddrinfo("rs1d") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2330] getaddrinfo("rs1c") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2327] getaddrinfo("rs2b") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2327] getaddrinfo("rs2d") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2327] getaddrinfo("rs2c") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2327] getaddrinfo("rs2a") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2126] getaddrinfo("rs2b") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2126] getaddrinfo("rs2d") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2126] getaddrinfo("rs2c") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2126] getaddrinfo("rs2a") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2343] getaddrinfo("rs1b") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2343] getaddrinfo("rs1d") failed: No address associated with hostnameFri Nov 19 17:24:33 [conn2343] getaddrinfo("rs1c") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2332] getaddrinfo("rs1b") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2332] getaddrinfo("rs1d") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2332] getaddrinfo("rs1c") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2332] getaddrinfo("rs2b") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2332] getaddrinfo("rs2d") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2332] getaddrinfo("rs2c") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2332] getaddrinfo("rs2a") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2343] getaddrinfo("rs2d") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2343] getaddrinfo("rs2c") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2343] getaddrinfo("rs2a") failed: No address associated with hostnameFri Nov 19 17:24:34 [conn2343] trying reconnect to rs2d:27018

connPoolStats> db.runCommand("connPoolStats"){! "hosts" : {! ! "config1:27019" : {! ! ! "available" : 2,! ! ! "created" : 6! ! },! ! "set1/rs1a:27018,rs1b:27018" : {! ! ! "available" : 1,! ! ! "created" : 249! ! }, ...! },! "totalAvailable" : 5,! "totalCreated" : 1002,! "numDBClientConnection" : 3490,! "numAScopedConnection" : 3,}

db.serverStatus()3) Index counters "indexCounters" : { ! ! "btree" : { ! ! ! "accesses" : 15180175, ! ! ! "hits" : 15178725, ! ! ! "misses" : 1450, ! ! ! "resets" : 0, ! ! ! "missRatio" : 0.00009551932 ! ! } ! },

db.serverStatus()4) Op counterswww.ﬂickr.com/photos/cosmic_bandita/2395369614/

db.serverStatus()5) Background ﬂushingPicture is unrelated! Mmm, ice cream.

rs.status() { ! "_id" : 1, ! "name" : "rs3b:27018", ! "health" : 1, ! "state" : 2, ! "stateStr" : "SECONDARY", ! "uptime" : 1886098, ! "optime" : { ! ! "t" : 1291252178000, ! ! "i" : 13 ! }, ! "optimeDate" : ISODate("2010-12-02T01:09:38Z"), "lastHeartbeat" : ISODate("2010-12-02T01:09:38Z") },www.ex-astris-scientia.org/inconsistencies/ent_vs_tng.htm (yes it’s a replicator from Star Trek)

rs.status()1) myState Value Meaning 0 Starting up (phase 1) 1 Primary 2 Secondary 3 Recovering 4 Fatal error 5 Starting up (phase 2) 6 Unknown state 7 Arbiter 8 Downen.wikipedia.org/wiki/State_of_matter

rs.status()2) Optime "optimeDate" : ISODate("2010-12-02T01:09:38Z")www.ﬂickr.com/photos/robbie73/4244846566/

rs.status()3) Heartbeat "lastHeartbeat" : ISODate("2010-12-02T01:09:38Z")www.ﬂickr.com/photos/drawblindfaith/3400981091/

mongostat

mongostat 1) faultswww.ﬂickr.com/photos/mshades/294203396/

mongostat2) lockedwww.ﬂickr.com/photos/bbusschots/4541573665/

mongostat3) index misswww.ﬂickr.com/photos/gareandkitty/276471187/

mongostat4) queues

mongostat5) Diagnostics

Current operations db.currentOp(); { ! ! ! "opid" : "shard1:299939199", ! ! ! "active" : true, ! ! ! "lockType" : "write", ! ! ! "waitingForLock" : false, ! ! ! "secs_running" : 15419, ! ! ! "op" : "remove", ! ! ! "ns" : "sd.metrics", ! ! ! "query" : { ! ! ! ! "accId" : 1391, ! ! ! ! "tA" : { ! ! ! ! ! "$lte" : ISODate("2010-11-24T19:53:00Z") ! ! ! ! } ! ! ! }, ! ! ! "client" : "10.121.12.228:44426", ! ! ! "desc" : "conn" ! ! },www.ﬂickr.com/photos/jeffhester/2784666811/

Monitoring toolsRun yourself Ganglia

Monitoring toolsHosted monitoring

Monitoring toolsServer Density

Monitoring toolswww.mongomonitor.com

RecapKeep it in RAM

RecapKeep it in RAMWatch your storage

RecapKeep it in RAMWatch your storagedb.serverStatus()rs.status()

mongostat

David Mytton @davidmyttondavid@boxedice.comwww.mongomonitor.comWoop Japan!

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Monitoring MongoDB (MongoSV)

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