[CASSANDRA-17034] CEP-11: Memtable API implementation

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.1-alpha1, 4.1
• Component/s: Local/Memtable
• Change Category: Performance
• Complexity: Normal
• Platform: All
• Impacts: Docs

Source Control Link

https://github.com/apache/cassandra/commit/e4e19e33faf9ac7cf27a9779c8083a7f5c5b865a

Test and Documentation Plan

Existing memtable implementation is tested as before. New implementations will need to also perform all memtable tests in addition to implementation-specific unit tests.

New configuration options need to be added to the documentation.

 

• Assignee: Branimir Lambov
• Reporter: Branimir Lambov

Authors

Branimir Lambov

Reviewers

Andres de la Peña, Caleb Rackliffe

• Created: 12/Oct/21 14:05
• Updated: 17/Nov/22 10:01
• Resolved: 29/Apr/22 12:09

Description

Pluggable memtable API as described in CEP-11.

 

Initial version is already available in this branch, and needs to be updated to the changes in trunk. Two additional features suggested by CEP reviewers are also to be implemented:

• Sharding support: extending the memtable owner interface to supply suitable shard boundaries that split the owned token space and are in agreement with disk boundaries.
• Shared read API with sstables: defining a common interface for reading partitions from memtables and sstables; this is to include filters to avoid unnecessary copying.

Issue Links

• causes: CASSANDRA-18040 Avoid schema mismatch problems on memtable API misconfiguration
• is depended upon by: CASSANDRA-16052 CEP-7 Storage Attached Indexes (Phase 1)
• relates to: CASSANDRA-17761 WEBSITE - July 2022 blog "Apache Cassandra 4.1 Features: Pluggable Memtable Implementations"
• links to: PR dtest
• links to: PR trunk