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Auke Kok
5f77e135a9
A partitioned cluster may have members attempt elections while partitioned off from a healthy cluster. These members degrade from server to follower and can hold elections in rapid succession, but never win. Fencing should shut them down regardless within a certain amount of time, but they may already hold elections and record them as incremented TERMs. When rejoining the quorum with a higher TERM they tend to usurp a healthy leader, but, there is no reason to. We can postpone this by carefully looking at heartbeats and what is in the quorum blocks. These followers will not have been elected with a TERM higher than the one we may hear heartbeats from. Signed-off-by: Auke Kok <auke.kok@versity.com>
Introduction
scoutfs is a clustered in-kernel Linux filesystem designed to support large archival systems. It features additional interfaces and metadata so that archive agents can perform their maintenance workflows without walking all the files in the namespace. Its cluster support lets deployments add nodes to satisfy archival tier bandwidth targets.
The design goal is to reach file populations in the trillions, with the archival bandwidth to match, while remaining operational and responsive.
Highlights of the design and implementation include:
- Fully consistent POSIX semantics between nodes
- Atomic transactions to maintain consistent persistent structures
- Integrated archival metadata replaces syncing to external databases
- Dynamic seperation of resources lets nodes write in parallel
- 64bit throughout; no limits on file or directory sizes or counts
- Open GPLv2 implementation
Community Mailing List
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