What's New in MongoDB 8.0 - Mydbops MyWebinar Edition 34
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The document presents an overview of the new features and enhancements in MongoDB 8.0, which includes significant performance improvements in write and read operations, workload-specific optimizations, and advanced sharding capabilities. It also discusses command path optimization, improved query insights, and the introduction of persistent query settings to enhance operational efficiency. Additionally, it highlights the expected performance boosts for various workloads, including time series data management and queryable encryption improvements.
![Challenges with Previous Methods
â Using planCacheSetFilter
â Configuration not persisted across restarts.
â Operational challenges in maintaining settings.
Code example:
Persistent Query Settings
db.runCommand(
{
planCacheSetFilter: <collection>,
query: <query>,
sort: <sort>,
projection: <projection>,
indexes: [ <index1>, <index2>, ...],
}
)](https://image.slidesharecdn.com/mongodb8-240826042055-52f7317c/85/What-s-New-in-MongoDB-8-0-Mydbops-MyWebinar-Edition-34-15-320.jpg)
What's New in MongoDB 8.0 - Mydbops MyWebinar Edition 34
- 1. Manosh Malai CTO, Mydbops LLP Mydbops MyWebinar Edition 34 Whatâs New In MongoDB 8.0
- 2. About Me Manosh Malai â Interested in Open Source technologies â Interested in MongoDB, DevOps & DevOpSec Practices â Tech Speaker/Blogger â MongoDB User Group Leader(Bangalore)
- 3. Consulting Services Consulting Services Managed Services â Database Management and consultancy provider â Founded in 2016 â Assisted 800+ happy customers â AWS partners â PCI & ISO certified About Us
- 4. â Performance Enhancements â Workload Specific Improvements â Time Series Enhancements â Command Path Optimization â Express Path Efficiency â Advanced Sharding Capabilities â Moving unsharded collections â Converting sharded collections to unsharded â Queryable Encryption Enhancements â Persistent Query Settings Agenda
- 6. â Up to 54% improvement in write performance (YCSB Write Bulk Data) â Read performance gains of up to 27% (YCSB Read-Heavy workloads) â Mixed workload improvements (95% Read, 5% Write) see up to 25% gains â Linkbench benchmarks suggest an 18% performance increase â Time Series workloads (TSBS) benefit from up to a 60% boost Performance Enhancements Benchmark Improvement YCSB Write-Heavy (100% Write) Up to 54% YCSB Read-Heavy (95% Read) Up to 27% Linkbench (if data available) Up to 18% Time Series Workloads (TSBS) Up to 60%
- 8. MongoDB 5.0, 6.0 & 7.0 â Storage Engine: Classic â> SBE â Significant improvements: $group, $project, $match, $sort, $lookup(in replica) Operation â Columnar Storage: Boosts performance for aggregation, sorting, visualization(Time Series Enhancements) â Game-Changer: Efficiently handles large volumes of time series data MongoDB 8.0 (Expected) â Block Processing: Faster queries $group 60% Improvement â Awaiting Details: Confirmed improvements, documentation pending Workload Specific Improvements
- 9. Command Path Optimization in MongoDB 8.0 â Overview: Major overhaul of the internal command path handling â Performance: Significant enhancements for faster response times â Efficiency: More efficient database operations guaranteed References â https://jira.mongodb.org/browse/SERVER-80296 â https://jira.mongodb.org/browse/SERVER-84283 â https://jira.mongodb.org/browse/SERVER-82831 Workload Specific Improvements
- 10. Express Path Latency Improvement â Improvement: 17% Latency Reduction â Key Enhancement: Introduction of SortedDataKeyValueView and seekForKeyValueView Current Method â Invocation: Uses SortedDataInterface::seek with index key â Creation: Constructs underutilized BSONObj â Data Retrieval: Fetches IndexKeyEntry with RecordId Reference: â https://jira.mongodb.org/browse/SERVER-89445 â mongo-r8.0.0-rc10/src/mongo/db/storage/key_string.h â mongo-r8.0.0-rc10/src/mongo/db/storage/sorted_data_interface.h Express Path Efficiency
- 11. Express Path Latency Improvement Proposed Method â Direct Retrieval: Uses seekForKeyValueView â Avoids BSONObj: Bypasses unnecessary BSONObj creation â Efficient Data Access: Combines keystring and RecordId into a tuple Benefits â Reduced Overhead: Streamlines query process â Enhanced Speed: Faster query execution in the Express Path â Resource Efficiency: Better performance and resource allocation Express Path Efficiency
- 12. â Google TCMalloc â Per-CPU Cache: Faster data access and reduced latency. â 18% Memory Fragmentation Reduction: More efficient use of memory. â Enhanced Peak Load Performance: Better responsiveness and stability under high load. Reduced Memory Fragmentation
- 13. Query Insight Features â Detailed Namespace-Level Metrics: Fast issue resolution with performance comparison across collections. â Heatmap Panel: Visualize and understand query trends. Improved Visibility In Query Insights: MongoDB Atlas
- 14. Query Shape and Rejection Filters Query Shape Standardization: â Uses kToRepresentativeParseableValue method to create a unified query shape. â Focuses on structural patterns for optimization. Reject Operations Using Query Shape: â Query Shape and Operation Rejection: â Standardizes query structure for optimization. â Identifies and simplifies structurally similar queries. â Rejects resource-consuming queries via their query shape. Improved Visibility In Query Insights: MongoDB Atlas db.adminCommand({ setQuerySetting: âxxxxxxâ, Settings: { Reject: true } })
- 15. Challenges with Previous Methods â Using planCacheSetFilter â Configuration not persisted across restarts. â Operational challenges in maintaining settings. Code example: Persistent Query Settings db.runCommand( { planCacheSetFilter: <collection>, query: <query>, sort: <sort>, projection: <projection>, indexes: [ <index1>, <index2>, ...], } )
- 16. New Feature: Persistent Query Settings Advantages: â Applies index for specific query shapes matching hash. â Replicates settings across replica set members. â Persists configurations between restarts. â No application code changes required. Persistent Query Settings db.adminCommand({ setQuerySettings: '<QueryShapeHash>', indexFilters: '<Index Name>' }) { planSummary: "COLLSCAN", queryShapeHash: '7F312F79FCOC3_*', durationMilli s: 11123232 // Too long } Code Example slow query log entry:
- 17. Global Read Timeout Definition â Set a default timeout (maxTimeMS) for all read operations across your cluster. â Protects against resource-intensive queries. â Ensures efficient query execution and cluster stability. Code example: Define Read Timeout Globally db.adminCommans( { setClusterParameter: { defaultMaxTimeMS: { readOperations: 20000} } } }
- 18. Move Unsharded Collection Simplified Process â Use db.adminCommand({moveCollection: "mydbops.mongodb", toShard: "shard1"}) to relocate unsharded collections. â Ensures seamless transfer without disrupting operations. Convert Sharded Collection to Unsharded Streamlined Operation â Utilize db.adminCommand({unshardCollection: "mydbops.mongodb", toShard: "shard1"}) for converting sharded collections to unsharded. â Enables faster resharding, reducing impact on workload significantly. Advanced Sharding Capabilities
- 19. Example: Resharding 500GB in a 1TB cluster now completes in hours, enhancing scalability and operational efficiency. Advanced Sharding Capabilities
- 20. Range Query Support Enhanced Functionality: â Introduces support for range queries within date ranges and numeric bounds. â Includes Decimal 128 for accurate handling of financial values. â Encrypted fields now support operators like $gt, $lt, $gte, and $lte. Queryable Encryption Enhancements in MongoDB 8.0
- 21. Thank you!