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1
Image copyright Yukihiro Matsumoto
MongoDB
to
MySQL




                  2
  Image copyright Yukihiro Matsumoto
MongoDB
to
MySQL
                                       • Data




                  2
  Image copyright Yukihiro Matsumoto
MongoDB
to
MySQL
                                       • Data
                                       • Ways
to
store
it




                  2
  Image copyright Yukihiro Matsumoto
MongoDB
to
MySQL
                                       • Data
                                       • Ways
to
store
it
                                       • Youthful

                                         indiscretion



                  2
  Image copyright Yukihiro Matsumoto
MongoDB
to
MySQL
                                       • Data
                                       • Ways
to
store
it
                                       • Youthful

                                         indiscretion
                                       • Data


                  2
  Image copyright Yukihiro Matsumoto
Sarah
Mei
@sarahmei


    3
Sarah
Allen
 (not
me)




                           4
              Photo copyright Lee Lundrigan
5
Images copyright Pivotal Labs, Inc.
5
Images copyright Pivotal Labs, Inc.
6
7
Photo by Henrik Moltke
Eben

                                                                                         Moglen



                                               8
Photo from The Internet Society, original: http://www.flickr.com/photos/internetsociety/5876916246
9
Images copyright (clockwise from top) Diaspora Inc., 10gen Inc., David Heinemeier Hansson.
9
Images copyright (clockwise from top) Diaspora Inc., 10gen Inc., David Heinemeier Hansson.
9
Images copyright (clockwise from top) Diaspora Inc., 10gen Inc., David Heinemeier Hansson.
“Social
data
isn’t

   relational”


        10
“Social
data
isn’t

   relational”
              ‐Twitter



        10
OOH
SHINY


                                          11
Photo from flickr user helen61, original: http://www.flickr.com/photos/helen61/2873090945/
“Social
data
isn’t

   relational”
              ‐Twitter



        12
OOH
SHINY


                                          13
Photo from flickr user helen61, original: http://www.flickr.com/photos/helen61/2873090945/
Mismatches:




              14
Mismatches:
 • At
the
data
layer




                  14
Mismatches:
 • At
the
data
layer
 • At
the
mapping
layer




                  14
Mismatches:
 • At
the
data
layer
 • At
the
mapping
layer
Test‐driving
a
data
migration




                  14
Mismatches:
 • At
the
data
layer        We
are
here

 • At
the
mapping
layer
Test‐driving
a
data
migration




                  14
“document‐oriented

    database”

                  15
       Image copyright 10gen Inc.
tv_shows

many      seasons       many
                               reviews
  many       episodes

                        many cast_members




                        16
{title: 'Babylon 5',
  seasons: [
    {season_number: '1',
      episodes: [
        {ordinal_within_season: '1',
          title: 'Midnight on the Firing
          reviews: [{...}],
          cast_members: [{...}]
        }
      ]
    }
  ]
}
                   17
{title: 'Babylon 5',
  seasons: [
    {season_number: '1',
      episodes: [
        {ordinal_within_season: '1',
          title: 'Midnight on the Firing
          reviews: [{...}],
          cast_members: [{...}]
        }
      ]
    }
  ]
}
                   17
{title: 'Babylon 5',
  seasons: [
    {season_number: '1',
      episodes: [
        {ordinal_within_season: '1',
          title: 'Midnight on the Firing
          reviews: [{...}],
          cast_members: [{...}]
        }
      ]
    }
  ]
}
                   17
{title: 'Babylon 5',
  seasons: [
    {season_number: '1',
      episodes: [
        {ordinal_within_season: '1',
          title: 'Midnight on the Firing
          reviews: [{...}],
          cast_members: [{...}]
        }
      ]
    }
  ]
}
                   17
18
18
users

many     friends       many
                               comments
  many         posts            many      commenters

                       many      likes

                                 many     likers




                          19
{name: 'Sarah Mei',
  friends: [
    {name: 'Thing 1',
      posts: [
        {message: 'go fly a kite',
          comments: [{...}],
          likes: [{...}],
          reshares: [{...}]
        }
      ]
    }
  ]
}
                   20
{name: 'Sarah Mei',
  friends: [
    {name: 'Thing 1',
      posts: [
        {message: 'go fly a kite',
          comments: [{...}],
          likes: [{...}],
          reshares: [{...}]
        }
      ]
    }
  ]
}
                   20
{name: 'Sarah Mei',
  friends: [
    {name: 'Thing 1',
      posts: [
        {message: 'go fly a kite',
          comments: [{...}],
          likes: [{...}],
          reshares: [{...}]
        }
      ]
    }
  ]
}
                   20
{name: 'Sarah Mei',
  friends: [
    {name: 'Thing 1',
      posts: [
        {message: 'go fly a kite',
          comments: [{...}],
          likes: [{...}],
          reshares: [{...}]
        }
      ]
    }
  ]
}
                   20
tv_shows

many      seasons       many
                                reviews
  many       episodes

                        many cast_members




                           21
users

many     friends       many
                               comments
  many         posts            many      commenters

                       many      likes

                                 many     likers




                          22
users

many     friends       many
                               comments
  many         posts            many      commenters

                       many      likes

                                 many     likers




                          23
tv_shows

many      seasons       many
                                reviews
  many       episodes

                        many cast_members




                           24
25
25
{name: 'Sarah Mei',
  friends: [
    {name: 'Thing 1',
      posts: [
        {message: 'go fly a kite',
          comments: [{...}],
          likes: [{...}],
          reshares: [{...}]
        }
      ]
    }
  ]
}
                   26
{name: 'Sarah Mei',
  friends: [
    {user_id: '4b866f08234ae01d21d8960
      posts: [
        {message: 'go fly a kite',
          comments: [{...}],
          likes: [{...}],
          reshares: [{...}]
        }
      ]
    }
  ]
}
                  27
28
Photo from flickr user befuddledsenses, original: http://www.flickr.com/photos/befuddledsenses/2903185831
1 “Social
data
isn’t

      relational”




           29
1 “Social
data
isn’t

      relational”

   “Eight‐table
joins

        ZOMG”
           29
2   
When
they
say
documents,
they
really
mean
                                                                         documents.




                                                    30
          Photo from flickr user horrgakx, original: http://www.flickr.com/photos/horrgakx/2963449465
Mismatches:
 • At
the
data
layer
 • At
the
mapping
layer      We
are
here

Test‐driving
a
data
migration




                   31
Faking
It




    32
Faking
It
• Faux
relational
interface
bad




              32
Faking
It
• Faux
relational
interface
bad
• JS
map/reduce
good




              32
Faking
It
• Faux
relational
interface
bad
• JS
map/reduce
good
  • But
lower‐level


              32
Faking
It
• Faux
relational
interface
bad
• JS
map/reduce
good
  • But
lower‐level
  • And
harder
to
test

              32
Y
U
SO
HARD?




     33
Y
U
SO
HARD?
• Less
documentation




                33
Y
U
SO
HARD?
• Less
documentation
• Harder
to
google
for
stuff




                 33
Y
U
SO
HARD?
• Less
documentation
• Harder
to
google
for
stuff
• Smaller
community




                 33
Y
U
SO
HARD?
• Less
documentation
• Harder
to
google
for
stuff
• Smaller
community
• Less
gem
support




                 33
Y
U
SO
HARD?
• Less
documentation
• Harder
to
google
for
stuff
• Smaller
community
• Less
gem
support
• Developers
had
no
Mongo
experience


                 33
34
Illustration from flickr user katy_tresedder, original: http://www.flickr.com/photos/katy_tresedder/4902794900
Y
U
SO
HARD?
              In
General:
• Less
documentation
• Lower
googlability
• Smaller
community
• Less
gem
support
• Team
of
developers
with
no
Mongo
experience



                     35
36
Photo from flickr user nswmaritime, original: http://www.flickr.com/photos/nswmaritime/2963649924
36
Photo from flickr user nswmaritime, original: http://www.flickr.com/photos/nswmaritime/2963649924
Every
non‐standard

  technology
choice

reduces
our
ability
to

    iterate
quickly.

          37
38
Photo from flickr user nzgabriel, original: http://www.flickr.com/photos/nzgabriel/2607065194
39
Mismatches:
 • At
the
data
layer
 • At
the
mapping
layer
Test‐driving
a
data
migration
                        We
are
finally
here




                  40
41
Photo from flickr user werkunz, original: http://www.flickr.com/photos/werkunz/5160818883
42
Photo from the Seattle Municipal Archives, accessed at: http://www.flickr.com/photos/seattlemunicipalarchives/4328053793
Test‐driving
the
migration




            43
“Test‐driving”
the
migration




             44
“Test‐driving”
the
migration
The
Easy
Way




               44
“Test‐driving”
the
migration
The
Easy
Way
  1. Test‐drive
conversion
of
a
single
sub‐
     document
from
JSON
to
CSV




                        44
“Test‐driving”
the
migration
The
Easy
Way
  1. Test‐drive
conversion
of
a
single
sub‐
     document
from
JSON
to
CSV
  2. Test‐drive
import
of
that
CSV
into
AR




                        44
“Test‐driving”
the
migration
The
Easy
Way
  1. Test‐drive
conversion
of
a
single
sub‐
     document
from
JSON
to
CSV
  2. Test‐drive
import
of
that
CSV
into
AR
  3. Run
it
on
a
copy
of
the
production
database*



                        44
“Test‐driving”
the
migration
The
Easy
Way
  1. Test‐drive
conversion
of
a
single
sub‐
     document
from
JSON
to
CSV
  2. Test‐drive
import
of
that
CSV
into
AR
  3. Run
it
on
a
copy
of
the
production
database*
  4. Add
more
test
cases


                        44
“Test‐driving”
the
migration
The
Easy
Way
  1. Test‐drive
conversion
of
a
single
sub‐
     document
from
JSON
to
CSV
  2. Test‐drive
import
of
that
CSV
into
AR
  3. Run
it
on
a
copy
of
the
production
database*
  4. Add
more
test
cases


                        44
“Test‐driving”
the
migration
The
Hard(er)
Way




              45
“Test‐driving”
the
migration
The
Hard(er)
Way
   • Batching




                45
“Test‐driving”
the
migration
The
Hard(er)
Way
   • Batching
   • activerecord‐import




                      45
“Test‐driving”
the
migration
The
Hard(er)
Way
   • Batching
   • activerecord‐import
   • LOAD
DATA
INFILE




                      45
“Test‐driving”
the
migration
 Gotchas




             46
“Test‐driving”
the
migration
 Gotchas
  • character
encoding




                         46
“Test‐driving”
the
migration
 Gotchas
  • character
encoding
  • converting
IDs




                         46
“Test‐driving”
the
migration
 Gotchas
  • character
encoding
  • converting
IDs
  • character
encoding




                         46
Code

github.com/diaspora/diaspora
  tag
last‐data‐conversion


             47
Diaspora
@joindiaspora


   Sarah
Mei
    @sarahmei
                                      48
Images not otherwise credited are copyright Sarah Mei and licensed cc-attribution
tv_shows

many      seasons       many
                                reviews
  many       episodes

                        many cast_members




                           49
surprise!




                                                                50
            Photo from flickr user industry_is_virtue, original: http://www.flickr.com/photos/industry_is_virtue/3209194592
tv_shows

many      seasons       many
                                reviews
  many       episodes

                        many cast_members




                           51
cast_members


{
character_name: “Cmdr Jeffrey Sinclair”,
actor_name: “Michael O’Hare”
}




                    52
So
far:




          53
So
far:
 • Why
MongoDB
wasn’t
a
good
fit
for

   Diaspora’s
data




                     53
So
far:
 • Why
MongoDB
wasn’t
a
good
fit
for

   Diaspora’s
data
 • The
mechanics
of
the
migration




                      53
So
far:
 • Why
MongoDB
wasn’t
a
good
fit
for

   Diaspora’s
data
 • The
mechanics
of
the
migration
 • Why
we
switched




                      53

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Taking Diaspora from MongoDB to MySQL (RubyConf 2011)

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