LDAP Cache TTL Management for Virtual Attribute Accuracy
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Solution Overview
Problem
LDAP servers face inaccuracies in cached and indexed data due to the lack of mechanisms to account for changes in virtual attributes, leading to outdated cache and index information.
Innovation Solution
Implementing a time-to-live (TTL) indicator for each data item in caches, indexes, and virtual data structures to determine the validity and reliability of stored data, allowing the LDAP server to manage and update data accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If virtual attributes are not cached or indexed to avoid inaccuracies, then data accuracy is improved, but data retrieval efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing virtual attribute values in the cache before they are requested. When an entry is cached, its virtual attributes are also computed and stored in advance, so they are immediately available when needed without requiring real-time calculation, thus maintaining both accuracy and efficiency
Solution Approach 2:
The patent introduces an intermediary mechanism (the cache with virtual attribute support) that mediates between the LDAP server and the client. The cache stores both regular attributes and pre-computed virtual attributes, acting as an intermediary that provides accurate data without requiring continuous server communication, thus improving retrieval efficiency while maintaining data accuracy
2Reliability
If cache and index are updated to reflect attribute changes, then data accuracy is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback by monitoring changes in source attributes and automatically triggering updates to cached entries and virtual attributes. When a source attribute changes, the system detects this change and propagates it to the cache, ensuring cache accuracy without requiring complex manual update mechanisms
Solution Approach 2:
The patent applies self-service by enabling the cache to automatically update itself when source data changes. The system monitors attribute changes and self-updates the cache and virtual attributes without external intervention, reducing system complexity while maintaining accurate cache data
3Productivity
If virtual attributes are cached with unlimited validity, then data retrieval efficiency is improved, but data reliability deteriorates
Solution Approach 1:
The patent applies dynamics by making virtual attribute validity dynamic rather than static. Virtual attributes are cached with indefinite validity by default, but their validity can be adjusted based on changes in source attributes. This dynamic approach allows the system to maintain high retrieval efficiency for stable attributes while ensuring reliability when source data changes
Data Source
AI summary
A method and apparatus for retrieving data from a Lightweight Directory Access Protocol (LDAP) repository. In one embodiment, the method includes receiving a request for data in a lightweight directory access protocol (LDAP) directory. The method may further include checking any one or more of an LDAP cache and an LDAP index for an LDAP attribute pertaining to requested data, the checking comprising determining if a time-to-live for the LDAP attribute or the LDAP index has expired, and returning the data to the client.