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The server sends sync requests to clients when it sees that they have open log trees that need to be committed for log merging to proceed. These are currently sent in the context of each client's get_log_trees request, resulting in sync requests queued for one client from all clients. Depending on message delivery and commit latencies, this can create a sync storm. The server's sends are reliable and the open commits are marked with the seq when they opened. It's easy for us to record having sent syncs to all open commits so that future attempts can be avoided. Later open commits will have higher seqs and will get a new round of syncs sent. Signed-off-by: Zach Brown <zab@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
Please join us on the open scoutfs-devel@scoutfs.org mailing list hosted on Google Groups