ae062f8b09
There's a bunch of moving pieces here:
- Add a new RingWriter class.
Stick it in a new swift.common.ring.io module. You *can* use it like
the old gzip file, but you can also define named sections which can
be referenced later on read. Section names may be arbitrary strings,
but the "swift/" prefix is reserved for upstream use. Sections must
contain a single length-value encoded BLOB. If sections are used, an
additional BLOB is written at the end containing a JSON section-index,
followed by an uncompressed offset for the index.
Move RingReader to ring/io.py, too.
- Clean up some ring metadata handling:
- Drop MD5 tracking in RingReader. It was brittle at best anyway, and
nothing uses it. YAGNI
- Fix size/raw_size attributes when loading only metadata.
- Add the ability to seek within RingReaders, though you need to know
what you're doing and only seek to flush points.
- Let RingBuilder objects change how wide their replica2part2dev_id
arrays are. Add a dev_id_bytes key to serialized ring metadata.
dev_id_bytes may be either 2 or 4, but 4 requires v2 rings. We
considered allowing dev_id_bytes of 1, but dropped it as unnecessary
complexity for a niche use case.
- swift-ring-builder version subcommand added, which takes a ring. This
lets operators see the serialization format of a ring on disk:
$ swift-ring-builder object.ring.gz version
object.ring.gz: Serialization version: 2 (2-byte IDs), build version: 54
Signed-off-by: Tim Burke <tim.burke@gmail.com>
Change-Id: Ia0ac4ea2006d8965d7fdb6659d355c77386adb70
12 lines
869 B
Plaintext
12 lines
869 B
Plaintext
__RINGFILE__, build version 4, id (not assigned)
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64 partitions, 3.000000 replicas, 4 regions, 4 zones, 4 devices, 2-byte IDs, 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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