d40031b46f
* Adds a composite_builder module which provides the functionality to
build a composite ring from a number of component ring builders.
* Add id to RingBuilder to differentiate rings in composite.
A RingBuilder now gets a UUID when it is saved to file if
it does not already have one. A RingBuilder loaded from
file does NOT get a UUID assigned unless it was previously persisted in
the file. This forces users to explicitly assign an id to
existing ring builders by saving the state back to file.
The UUID is included in first line of the output from:
swift-ring-builder <builder-file>
Background:
This is another implementation for Composite Ring [1]
to enable better dispersion for global erasure coded cluster.
The most significant difference from the related-change [1] is that this
solution attempts to solve the problem as an offline tool rather than
dynamic compositing on the running servers. Due to the change, we gain
advantages such as:
- Less code and being simple
- No complex state validation on the running server
- Easy deployments with an offline tool
This patch does not provide a command line utility for managing
composite rings. The interface for such a tool is still under
discussion; this patch provides the enabling functionality first.
Co-Authored-By: Clay Gerrard <clay.gerrard@gmail.com>
Co-Authored-By: Alistair Coles <alistairncoles@gmail.com>
[1] Related-Change: I80ef36d3ac4d4b7c97a1d034b7fc8e0dc2214d16
Change-Id: I0d8928b55020592f8e75321d1f7678688301d797
12 lines
857 B
Plaintext
12 lines
857 B
Plaintext
__RINGFILE__, build version 4, id (not assigned)
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64 partitions, 3.000000 replicas, 4 regions, 4 zones, 4 devices, 100.00 balance, 0.00 dispersion
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The minimum number of hours before a partition can be reassigned is 1 (0:00:00 remaining)
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The overload factor is 0.00% (0.000000)
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Ring file __RINGFILE__.ring.gz not found, probably it hasn't been written yet
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Devices: id region zone ip address:port replication ip:port name weight partitions balance flags meta
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0 0 0 127.0.0.1:6200 127.0.0.1:6200 sda1 100.00 0 -100.00 some meta data
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1 1 1 127.0.0.2:6201 127.0.0.2:6201 sda2 100.00 0 -100.00
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2 2 2 127.0.0.3:6202 127.0.0.3:6202 sdc3 100.00 0 -100.00
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3 3 3 127.0.0.4:6203 127.0.0.4:6203 sdd4 100.00 0 -100.00
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