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![primary
host1
secondary
host2
secondary
host3
Python Program
monitor
thread
monitor
thread
MongoClient
{secondary: true,
hosts: ["host1",
"host2",
"host3"]}
"mongodb://host1,host2/?replicaSet=my-rs"](https://image.slidesharecdn.com/1340int04-150605182002-lva1-app6892/85/MongoDB-Drivers-And-High-Availability-Deep-Dive-8-320.jpg)
![ismaster
(from secondary)
{"setName": "rs-name",!
"ismaster": false,!
"secondary": true,!
"hosts": ["host1", "host2", "host3"]}!](https://image.slidesharecdn.com/1340int04-150605182002-lva1-app6892/85/MongoDB-Drivers-And-High-Availability-Deep-Dive-9-320.jpg)
![{"setName": "rs-name",!
"ismaster": true,!
"secondary": false,!
"hosts": ["host1", "host2", "host3"]}!
ismaster
(from primary)](https://image.slidesharecdn.com/1340int04-150605182002-lva1-app6892/85/MongoDB-Drivers-And-High-Availability-Deep-Dive-10-320.jpg)
![primary
host1
secondary
host2
secondary
host3
Python Program
monitor
thread
monitor
thread
monitor
thread
MongoClient
{secondary: true,
hosts: ["host1",
"host2",
"host3"]}
"new info!"
Your
Code?
✓](https://image.slidesharecdn.com/1340int04-150605182002-lva1-app6892/85/MongoDB-Drivers-And-High-Availability-Deep-Dive-13-320.jpg)
![primary
host1
secondary
host2
secondary
host3
Python Program
monitor
thread
monitor
thread
monitor
thread
MongoClient
{ismaster: true,
hosts: ["host1",
"host2",
"host3"]}
{secondary: true,
hosts: ["host1",
"host2",
"host3"]}
Your
Code
insert
ok
✓
✓
"new info!"
insert
ok
✓](https://image.slidesharecdn.com/1340int04-150605182002-lva1-app6892/85/MongoDB-Drivers-And-High-Availability-Deep-Dive-15-320.jpg)
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MongoDB Drivers And High Availability: Deep Dive
The document outlines a MongoDB driver specification focusing on client-side operations, including server discovery and monitoring for high availability in a replica set environment. It discusses practical applications, addressing issues such as startup, steady state, and crisis resolution, alongside detailed examples of how the MongoDB client interacts with the replica set. Key considerations include error handling and configuration parameters for managing connection failures.
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MongoDB Drivers And High Availability: Deep Dive
- 1. MongoDB Drivers & High Availability A.Jesse Jiryu Davis Staff Engineer, MongoDB @jessejiryudavis
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- 3. • It’s aMongoDB driver specification. • (It’s not MMS.) • Written by me. Advisors: David Golden, Craig Wilson, Jeff Yemin. Overseen by Bernie Hackett. Server Discovery & Monitoring Spec
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- 8. primary host1 secondary host2 secondary host3 Python Program monitor thread monitor thread MongoClient {secondary: true, hosts:["host1", "host2", "host3"]} "mongodb://host1,host2/?replicaSet=my-rs"
- 9. ismaster (from secondary) {"setName": "rs-name",! "ismaster":false,! "secondary": true,! "hosts": ["host1", "host2", "host3"]}!
- 10. {"setName": "rs-name",! "ismaster": true,! "secondary":false,! "hosts": ["host1", "host2", "host3"]}! ismaster (from primary)
- 11. Updating Topology Description Current description + ismasterresponse → new description
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- 13. primary host1 secondary host2 secondary host3 Python Program monitor thread monitor thread monitor thread MongoClient {secondary: true, hosts:["host1", "host2", "host3"]} "new info!" Your Code? ✓
- 14. client.db.collection.insert({'my': 'document'})! client =MongoClient(! 'mongodb://host1,host2/?replicaSet=my-rs')!
- 15. primary host1 secondary host2 secondary host3 Python Program monitor thread monitor thread monitor thread MongoClient {ismaster: true, hosts:["host1", "host2", "host3"]} {secondary: true, hosts: ["host1", "host2", "host3"]} Your Code insert ok ✓ ✓ "new info!" insert ok ✓
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- 23. primary host1 secondary host2 secondary host3 monitor thread monitor thread monitor thread Your Code ✓ insert "Wake up!" (every halfsecond) MongoClient primary host2 ✓ insert ok ok Resolution ?
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- 25. client = MongoClient(! 'mongodb://host1,host2/?replicaSet=my-rs')! ! try:! client.admin.command('ismaster')! exceptpymongo.errors.ConnectionFailure as e:! print("Can't connect: %s" % e)! Non-Blocking Client Construction #1
- 26. Error Handling #2 def find_my_document():! try:! returncollection.find_one(query)! except ConnectionFailure:! logging.exception("finding document")! return collection.find_one(query)!
- 27. Error Handling #2 def insert_doc():! doc= {'_id': ObjectId(), 'a': 1}! try:! collection.insert(doc)! except ConnectionFailure:! logging.exception("inserting document")! # Try again.! collection.insert(doc)! except DuplicateKeyError:! # Previous try actually succeeded.! pass!
- 28. #2 Error Handling collection.update(! {'_id': 1},! {'$inc':{'counter': 1}})!
- 29. #2 Only idempotent operations can beretried Error Handling
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- 31. ConnectionFailure! monitor thread monitor thread monitor thread primary host1 secondary host2 secondary host3 Your Code insert insertMongoClient "Wake up!" waitfor connectTimeoutMS wait for serverSelectionTimeoutMS (30 seconds)
- 32.