MongoDB Diagnostics and Debugging by Asya

AirJD

没有录音文件

00:00/00:00

加收藏

MongoDB Diagnostics and Debugging by Asya

发布者 devops

发布于 1434360037983 浏览 6740 关键词 MongoDB, NoSQL, English

分享到

第1页

@MongoDB @asya999 #askAsya

Diagnostics and Debugging

Asya Kamsky

Principal Solutions Architect, MongoDB

第2页

#MongoDB @asya999 #askAsya

Diagnostics and Debugging

Asya Kamsky

Principal Solutions Architect, MongoDB

第7页

Understanding Crime Scene

第8页

Understanding Crime Scene

第10页

“Data! Data! Data!
I can't make bricks without clay.”

-- Sherlock Holmes,

The Adventure of the Copper Beeches

第11页

Gathering Data

第12页

“It is a capital mistake to
theorize before one has data.
Insensibly one begins to twist
facts to suit theories, instead
of theories to suit facts.”

-- Sherlock Holmes, A Scandal in Bohemia

第14页

“There is nothing like ﬁrst-hand evidence.”

-- Sherlock Holmes, A Study in Scarlet

第15页

Available Tools: OS

% iostat % free % blockdev --report % dmesg % ulimit -a % ifconﬁg, ip <...>, iptables % top, ...

第16页

Available Tools:

第17页

Available Tools: OS for MongoDB

% mongostat % mongotop

第18页

Available Tools: MongoDB shell

% mongostat % mongotop > db.currentOp( ), db.serverStatus( ) > rs.status( ) > sh.status( )

第19页

Available Tools:

% mongostat % mongotop > db.currentOp( ), db.serverStatus( ) > rs.status( ) > sh.status( )

MongoDB Management Service (MMS) Monitoring

第20页

Available Tools:

第21页

Available Tools:

第22页

Available Tools:

MongoDB Management Service (MMS) Monitoring

第23页

Available Tools:

第24页

mongod logs

第25页

mongod logs

Tue Jul 30 19:15:27.898 [conn2] query test.docs query: { query: { _id: { $gt: ObjectId('51da44a8a4435e3d7174b696') } }, orderby: { ts: 1.0 } } ntoreturn:10 ntoskip:0 nscanned:9235093 scanAndOrder:1 keyUpdates:0 numYields:5 locks(micros) r:6919962 nreturned:1 reslen:360 3578ms

第26页

mongod logs

第27页

mongod logs

第28页

"It is of the highest importance ... to be able to recognize, out of a number of facts, which are incidental and which vital. "

Sherlock Holmes, The Reigate Puzzle

第31页

https://github.com/rueckstiess/mtools

by Thomas Rückstieß

第32页

mtools

• mloginfo • mlogfilter • mplotqueries • mlogvis • mlaunch

第33页

mtools

• mloginfo • mlogfilter • mplotqueries

第34页

mloginfo

source: logs/mongodb.log.2014-05-04T15-52-59 start: 2014 May 02 00:29:21 end: 2014 May 04 15:52:59

date format: iso8601-local length: 17091234 binary: mongod

version: 2.6.0

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

source: logs/mongodb.log.2014-05-04T15-53-06 start: 2014 May 02 00:29:25 end: 2014 May 04 15:53:06

date format: iso8601-local length: 13696471 binary: mongod

version: 2.6.0

第35页

mplotqueries

$ mplotqueries --help usage: mplotqueries [OPTIONS] [logfile [logfile ...]]

A script to plot various information from logfiles. ...

第36页

第37页

第38页

第39页

第40页

第41页

第42页

第43页

mplotqueries

$ mplotqueries --help usage: mplotqueries [OPTIONS] [logfile [logfile ...]]

A script to plot various information from logfiles. ...

optional arguments:

--type {nscanned/n,rsstate,connchurn,durline,histogram,range,scatter,event} type of plot (default=scatter with --yaxis duration)

--group GROUP

specify value to group on. All basic plot types can group on 'namespace', 'operation', 'thread', 'pattern' ...

第45页

"... what is out of the common is usually a guide rather than a hindrance."

— Sherlock Holmes, A Study in Scarlet

第46页

The Adventure of the Missing Three-Quarter (Indexes)

第47页

第48页

mloginfo

$ mloginfo firstmongo.log source: firstmongo.log

start: 2014 Jun 10 11:19:54

end: 2014 Jun 17 17:14:15

date format: iso8601-local

length: 14170668 binary: mongod

version: 2.6.1

mloginfo firstmongo.log –-queries

namespace

pattern

count

db1.request {"requestSender": 1}

db1.request {"curRoute": 1,"isAdv": 1 } 169

db1.report {"deliveryTime": 1}

db2.report {"deliveryTime": 1}

db3.report {"deliveryTime": 1}

db1.pending {"sentTime": 1, "status": 1} 9

max (ms)

350161 9585

111421 85267 72071

mean (ms)

93828 3942

71536 60363 53062

95%-ile (ms)

339441.2 6324.2

106609.4 81508.15

70781.3

88470.4

sum (ms)

2721018 666302

643829 603634 530624

第49页

mplotqueries

% mplotqueries firstmongo.log --type nscanned/n

第50页

mplotqueries

% mplotqueries firstmongo.log --type nscanned/n

第51页

第52页

第53页

第54页

mplotqueries

% mplotqueries firstmongo.log --type nscanned/n 2014-06-17T17:13:34.235 [conn1569841] query db1.coll query: { time: { $lt: "2014-06-17 17:13:31", $gte: "2014-06-17 17:04:31" } } planSummary: COLLSCAN ntoreturn:0 ntoskip:0 nscanned:5169727 nscannedObjects: 5169727 keyUpdates:0 numYields:12492 locks(micros) r:37736571 nreturned:72 reslen:32707 30129ms 2014-06-17T17:13:47.607 [conn1569990] query db2.coll query: { time: { $lt: "2014-06-17 17:14:05", $gte: "2014-06-17 17:05:05" }, status: 8 } planSummary: COLLSCAN ntoreturn:0 ntoskip:0 nscanned:2057564 nscannedObjects:2057564 keyUpdates:0 numYields:5008 locks(micros) r:11557172 nreturned:56 reslen:18745 13086ms

第55页

第56页

第57页

The Sign of Four (Shards)

第58页

% mplotqueries updates?.log

第59页

% mplotqueries updates?.log

第60页

% mplotqueries updates?.log

第61页

% mplotqueries updates?.log

第62页

% mplotqueries updates?.log

第63页

"Eliminate all other factors, and the

one which remains must be the truth."

Sherlock Holmes -The Sign of Four

第64页

The Case of Identity

第68页

% mplotqueries –type histogram –group namespace –bucketSize 3600

第75页

The Stockbroker's Clerk's Query

第77页

% mplotqueries –type connchurn

第90页

"We balance probabilities and choose the most likely. It is the scientiﬁc use of the imagination."

Sherlock Holmes, The Hound of the Baskervilles

With profound thanks to:

Sir Arthur Conan Doyle (1859-1930)

第91页

#MongoDB @asya999 #askAsya

Thank You

Asya Kamsky

MongoDB, Inc.

http://askasya.com/ http://www.kamsky.org/