An Evening with MongoDB - Toronto 2012: Welcome and Keynote

Jenna deBoisblanc
Welcome to MongoDB Toronto and a keynote about what is happening with 10gen, the company behind MongoDB and what is to come.

Transcript

1. An evening in Toronto
   with MongoDB 2.2
   Jenna deBoisblanc
   Support Engineer, 10gen
   jenna@10gen.com
   @jdeboisblanc
   

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2. MongoDB Releases
   2.2
   Aug ‘12
   2.0
   Sept ‘11
   1.8
   March ‘11
   2.2-rc0: July 19th
   2.2-rc1: targeted July 31st
   2.2 – out shortly after
   

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3. Concurrency)improvements
   Aggregation)framework
   Tag)aware)sharding
   Read)Preferences
   TTL)Collections
   Shell)enhancements
   More…
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   New features in 2.2
   

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4. DB#Level#Locking
   Global#lock#for#journaling,#fsync#etc.#only
   Easy#transition#to#collection;level#locks
   Replication#can#happen#in#parallel#to#write#(client#db#vs.
   local)
   Yielding#on#page#faults
   Started#with#2.0
   Yielding#for#updates
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   Concurrency Improvements
   

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5. Concurrency Stats
   db.serverStatus(-)-
   shows-db-level-locks
   page-fault-details
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   > db.serverStatus().recordStats
   {
   "accessesNotInMemory" : 1,
   "pageFaultExceptionsThrown" : 1,
   "local" : {
   "accessesNotInMemory" : 0,
   "pageFaultExceptionsThrown" : 0
   },
   "test" : { .... }
   “foo” : { ... }
   }
   

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6. Replaces(common(uses(of(map/reduce
   Implemented(in(C++
   Query(optimizer(can(use(indexes
   Chained(operators
   $project(–(specified(fields,(compute(values(etc.
   $unwind(–(stream(arrays
   $group(–(aggregate(on(key
   $match
   $sort
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   Aggregation framework
   

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7. {"_id:"1,"tags:"[“Jenna”,"“pizza”]"}
   {"_id:"2,"tags:"[“Jenna”,"“sushi”,"“pizza”]"}
   >db.collection.aggregate(
   """""{$unwind:"“$tags”},
   """""{$group:"{_id:"“$tags”,"total:"{$sum:1}"}"}")
   "result"":"[
   """"""""""""""""{"_id"":""sushi",""total"":"1},
   """"""""""""""""{"_id"":""pizza",""total"":"2},
   """"""""""""""""{"_id"":""Jenna",""total"":"2}
   """"""""]
   Aggregation Framework – example
   

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8. Use$cases
   force$writes$to$local$data$center
   distribute$data$based$on$usage
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   Tag aware sharding
   

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9. Modes
   Drivers*set*on*a*per/connection,*per/collection,*or
   per/operation*basis
   Primary*(default)*
   Primary_Preferred
   Secondary
   Secondary_Preferred
   Nearest
   Replica*set*tags
   Read*support*for*replica*set*tags
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   Read Preferences
   

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10. “Time%To%Live”
    Use%field%in%document%to%specify%expiry
    Constraints
    Indexed%field%must%be%a%BSON%date%type
    Cannot%be%used%on%capped%collection
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    TTL Collections
    {_id:%1,%name:%“Jenna”,%status:%BSONDate}
    >%db.log.ensureIndex({“status”:%1},%{expireAfterSeconds:%3600})
    

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11. Verbose'mode
    >'set$verbose$true
    >'db.foo.update('{'},'{$set:'{field:'10}'}')
    Updated'2'existing'record(s)'in'2ms
    Enhanced'editing'features
    multiDline'support
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    Shell enhancements
    

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12. Replication
    rs.syncFrom(2“[hostname]2:2[port]”2)2
    specify2who2to2sync2from
    Tools
    mongooplog2–2tool2for2replaying2oplog
    Authentication2support2and2concurrency2statistics2in
    mongotop2and2mongostat
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    More…
    

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13. Even More!
    Query&optimizer
    Many&improvements&not&directly&visible&to&user
    Better&support&for&$in&+&sort&+&limit
    Map/reduce
    Choose&initial&split&points&for&sharded&output
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14. What’s next?
    

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15. Operational+enhancements
    External+authentication+integration
    Fragmentation+reduction
    New+features
    Full9text+search
    Performance+improvements
    More+granular+locks
    Improved+aggregation+framework
    Index+improvements
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    Post 2.2
    

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16. We’re Hiring !
    jenna@10gen.com
    mongoDB.org
    

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