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We just added a test to try and get srch compaction stuck by having an input file continue at a specific offset. To exercise the bug the test needs to perform 6 compactions. It needs to merge 4 sets of logs into 4 sorted files, it needs to make partial progress merging those 4 sorted files into another file, and then finall attempt to continue compacting from the partial progress offset. The first version of the test didn't necessarily ensure that these compactions happened. It created far too many log files then just waited for time to pass. If the host was slow then the mounts may not make it through the initial logs to try and compact the sorted files. The triggers wouldn't fire and the test would fail. These changes much more carefully orchestrate and watch the various steps of compaction to make sure that we trigger the bug. 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
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