What s new in Mongo 4.0. Vinicius Grippa Percona
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1 What s new in Mongo 4.0 Vinicius Grippa Percona
2 About me Support Engineer at Percona since 2017 Working with MySQL for over 5 years - Started with SQL Server Working with databases for 7 years 2
3 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 3
4 A brief history MongoDB was developed in 2007 by organization called 10gen MongoDB has grown from being a niche database solution to the Swiss army knife of the NoSQL technologies It was developed as a PAAS (Platform as a service) Currently there is MongoDB Atlas Database as a Service (DBaaS) 4
5 MongoDB Roadmap 5
6 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 6
7 Transactions Support
8 Transactions Support Transactions feature has been in development since MongoDB version 3.0 (Two Phase Commit) Logical sessions added on Mongo 3.6 MongoDB 4.0 adds support for multi-document transactions 8
9 Transactions - ACID Atomicity Consistency Isolation Durability 9
10 Transactions - ACID Atomicity "all or nothing" guarantee for multi-document transaction operations Data changes are only made visible outside the transaction if it is successful. If a transaction fails, all of the data changes from the transaction is discarded. 10
11 Transactions - ACID Consistency Handled by MongoDB example: trying to change a value that fails schema validation, will cause inconsistent data (permitted transactions should not corrupt data) 11
12 Transactions - ACID Isolation Snapshot isolation level creates a WiredTiger snapshot at the beginning of the transaction uses this snapshot to provide transactional reads throughout the transaction. 12
13 Transactions - ACID Durability When a transactions use WriteConcern {j: true} (default), MongoDB will guarantee that it is returned after the transaction log is committed. Even if a crash occurs, MongoDB can recover according to the transaction log. If the {j: true} level is not specified, even after the transaction is successfully committed, the transaction may be rolled back (in case of crash recovery) Needs journal enabled 13
14 Transactions Support Start Transaction session = db.getmongo().startsession() session.starttransaction() session.getdatabase("percona").test.insert({today : new Date()}) session.getdatabase("percona").test.insert({some_value : "abc"}) 14
15 Transactions Support 1 2 Commit/Rollback Transaction session.committransaction() session.aborttransaction() 15
16 Transactions and Replica set In the replica set configuration, an oplog will be recorded on commit including all the operations in the transaction. The slave node pulls the oplog and replays the transaction operations locally (the document size limit is 16 MB, so whole transaction can not exceed 16MB) 16
17 Transactions and Wired Tiger Unified Transaction Timing WiredTiger has supported transactions for a long time (guarantee the modification atomicity of data, index, and oplog) The problem was with timing: MongoDB used the oplog timestamps to identify the global order WiredTiger used the internal transaction IDs to identify the global order MongoDB version 4.0 / WiredTiger 3.0 introduced transaction timestamps MongoDB can now explicitly assign a commit timestamp to the WiredTiger transaction (read "as of" a timestamp) When the oplog is replayed, the read on the slave node will no longer conflict with the replayed oplog, and the read request will not be blocked by replaying the oplog. 17
18 Transactions - Conflict foo:primary> session = db.getmongo().startsession() session { "id" : UUID("b312c c-47c5-b0c9-23d77f4e9f6d") } foo:primary> session.starttransaction() foo:primary> session.getdatabase("percona").test.update({trx : 0}, {trx: 2}) WriteCommandError({ "errorlabels" : [ "TransientTransactionError" ], "operationtime" : Timestamp( , 1), "ok" : 0, "errmsg" : "WriteConflict", "code" : 112, "codename" : "WriteConflict", "$clustertime" : { "clustertime" : Timestamp( , 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyid" : NumberLong(0) 18
19 Transactions Write Concern MongoDB is a distributed database- be aware of the different options for consistency. Write concern describes the level of acknowledgement requested from MongoDB for write operations For multi-document transactions, you set the write concern at the transaction level, not at the individual operation level. Session.startTransaction({ writeconcern: { w: <level>} }) // w: 1, majority If you commit using "w: 1" write concern, your transaction can be rolled back during the failover process. 19
20 Transactions Read Concern The readconcern option allows you to control the consistency and isolation properties of the data read from replica sets and replica set shards. For multi-document transactions, you set the read concern at the transaction level, not at the individual operation level. If unspecified at the transaction start, transactions use the session-level read concern or, if that is unset, the client-level read concern. Session.startTransaction({ readconcern: { level: <level>} }) 20
21 Transactions Read Concern Read concern "snapshot" is only available for multi-document transactions. Multi-document transactions support read concern "snapshot" as well as "local", and "majority". Session.startTransaction({ readconcern: { level: "snapshot"} }) 21
22 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 22
23 Snapshot Read Concern
24 Snapshot Read Concern readconcern option helps in achieving consistency, and isolation properties of the data. Snapshot Read Concern ensures that a consistent view of the data is returned to the client, irrespective of whether that data is being simultaneously modified by concurrent operations. 24
25 Snapshot Read Concern If the transaction is not part of a causally consistent session, upon transaction commit with write concern "majority", the transaction operations are guaranteed to have read from a snapshot of majority-committed data. If the transaction is part of a causally consistent session, upon transaction commit with write concern "majority", the transaction operations are guaranteed to have read from a snapshot of majority-committed data that provides causal consistency with the operation immediately preceding the transaction start. 25
26 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 26
27 Security Enhancements
28 Security Enhancements SHA-2 Authentication With MongoDB 4.0, authentication has been updated to the latest SHA-2 family (SHA-256), providing a stronger alternative to SHA-1 28
29 Security Enhancements Mongo 3.6 authenticationrestrictions: [ { clientsource: ["<IP>" "<CIDR range>",...] serveraddress: ["<IP>" "<CIDR range>",...] }, 29
30 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 30
31 Non-Blocking Secondary Reads
32 Non-Blocking Secondary Reads Non-Blocking Secondary Reads MongoDB previously blocked secondary reads while oplog entries were applied. when the replication threads were writing to the database the readers must wait MongoDB 4.0 adds the ability to read from secondaries while replication is simultaneously processing writes. 32
33 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 33
34 Extension to Change Streams
35 Extension to Change Streams Change streams introduced in version 3.6 helps applications to access real-time data changes (similar to tail the collection but better as it is replication aware). In 4.0 Change Streams can be configured to track changes across an entire database or whole cluster. Also, it will return a cluster time associated with an event (to provide an associated wall clock time for the event) 35
36 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 36
37 Data Type conversions
38 Data Type Conversions A new expression $convert has been added to the aggregation framework Helps for ETL workloads Also allow the MongoDB BI Connector to push down work to MongoDB Server (and avoid sending data over the wire) 38
39 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 39
40 Improved Sharding Operations
41 Improved Sharding Operations Operators can now list and kill queries running in a sharded cluster directly on a mongos node. Query terminated in any one of the shards will be reflected in all other shards too. 41
42 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 42
43 Hybrid Cursor Caching
44 Hybrid Cursor Caching Improvements in cursor caching unlock up to 2x performance gains on deployments running with a large number of collections and enable operations like dropping a collection to execute without causing any performance degradation on other active collections. 44
45 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 45
46 Slow Query logging on MongoS
47 Slow Query logging on MongoS In previous versions of MongoDB profiling can be enabled on the mongod. Now in 4.0 its easy to track the slow queries from mongos by enabling the profiler. 47
48 Agenda Transactions Support Snapshot Read Concern Security enhancements Non-Blocking Secondary Reads Extension to Change Streams Data type conversions Improved Sharding Operations Hybrid Cursor Caching Slow Query Logging on MongoS The Future Features 48
49 The Future
50 Future Features Transaction compatible chunk migrations More extensive WiredTiger Transaction manager Global point in time reads Oplog applier prepare supports for transactions 50
51 Rate My Session 51
52 Thank You Sponsors!! 52
Use multi-document ACID transactions in MongoDB 4.0 November 7th Corrado Pandiani - Senior consultant Percona
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