Log Agent Packet Sequencing for Reliable Transmission
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Solution Overview
Problem
Existing methods for collecting and disseminating log information from hosted services and multi-tenant systems face challenges such as data loss, duplication, and inefficiency due to network disruptions and downtime, particularly in continuous log stream transmission.
Innovation Solution
A system employing a log agent that collects and transmits log information as ordered sequences with unique identifiers, ensuring reliable transmission by resending packets upon acknowledgment and using sequence identifiers to prevent duplication, while adjusting packet size and transmission rate to match processing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If log information is transmitted continuously over the network, then real-time monitoring capability is improved, but data loss and duplication occur due to network disruptions
Solution Approach 1:
The log stream is divided into discrete packets, each containing a sequence identifier. This segmentation allows individual packets to be tracked and retransmitted independently if lost, resolving the contradiction by enabling continuous transmission while maintaining reliability through packet-level error handling.
Solution Approach 2:
Sequence identifiers are assigned to log packets before transmission. This preliminary action enables the receiving end to detect duplicates and losses by checking sequence numbers, allowing reliable reconstruction of the log stream even when network disruptions occur during continuous transmission.
2Productivity
If packet size is increased to reduce transmission overhead, then transmission efficiency is improved, but processing capacity is exceeded causing data loss
Solution Approach 1:
The packet size and transmission rate are dynamically adjusted based on the processing capacity of the log service. When processing capacity is available, larger packets are transmitted to improve efficiency; when capacity is constrained, packet size and rate are reduced to prevent data loss, thus resolving the contradiction between transmission efficiency and processing reliability.
Solution Approach 2:
The system monitors processing capacity and uses this feedback to adjust transmission parameters. This closed-loop control ensures that transmission efficiency is maximized without exceeding processing capacity, preventing data loss while maintaining high productivity.
3Loss of time
If transmission rate is increased to improve real-time monitoring, then response time is reduced, but data duplication occurs during retransmission
Solution Approach 1:
Sequence identifiers are embedded in each packet before transmission at high speed. This preliminary tagging enables the receiving end to quickly identify and filter duplicate packets during retransmission, allowing fast transmission without information loss.
Solution Approach 2:
Sequence identifiers act as disposable markers that are used once to identify packets and then discarded. This cheap mechanism allows rapid duplicate detection during high-speed transmission without consuming significant resources, resolving the contradiction between speed and information integrity.
4Quantity of substance
If log data is retained in large files for analysis, then comprehensive system behavior tracking is improved, but file handling and viewing become difficult
Solution Approach 1:
Instead of retaining all log data in single large files, the system segments logs into manageable packets distributed across multiple storage locations. This segmentation maintains comprehensive log data volume while improving ease of operation by allowing selective access and processing of individual packets rather than handling entire large files.
Solution Approach 2:
The system transitions from a single-dimension large file structure to a multi-dimensional packet-based organization. Logs are distributed across multiple files and storage locations with metadata indexing, enabling efficient retrieval and handling of specific log segments without moving or copying entire large files.
Data Source
AI summary
A system for collecting and disseminating log information may comprise a log agent and a log service. A log agent may transmit a log stream to a log service using non-overlapping adjacent subsets of log entries. Each subset may be associated with a unique and monotonically increasing sequence number, which is not incremented until the subset is received and processed by a log service.