mirror of
https://github.com/octoleo/syncthing.git
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916ec63af6
This is a new revision of the discovery server. Relevant changes and non-changes: - Protocol towards clients is unchanged. - Recommended large scale design is still to be deployed nehind nginx (I tested, and it's still a lot faster at terminating TLS). - Database backend is leveldb again, only. It scales enough, is easy to setup, and we don't need any backend to take care of. - Server supports replication. This is a simple TCP channel - protect it with a firewall when deploying over the internet. (We deploy this within the same datacenter, and with firewall.) Any incoming client announces are sent over the replication channel(s) to other peer discosrvs. Incoming replication changes are applied to the database as if they came from clients, but without the TLS/certificate overhead. - Metrics are exposed using the prometheus library, when enabled. - The database values and replication protocol is protobuf, because JSON was quite CPU intensive when I tried that and benchmarked it. - The "Retry-After" value for failed lookups gets slowly increased from a default of 120 seconds, by 5 seconds for each failed lookup, independently by each discosrv. This lowers the query load over time for clients that are never seen. The Retry-After maxes out at 3600 after a couple of weeks of this increase. The number of failed lookups is stored in the database, now and then (avoiding making each lookup a database put). All in all this means clients can be pointed towards a cluster using just multiple A / AAAA records to gain both load sharing and redundancy (if one is down, clients will talk to the remaining ones). GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4648
85 lines
2.5 KiB
Go
85 lines
2.5 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package bcache provides access to statistics exposed by the bcache (Linux
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// block cache).
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package bcache
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// Stats contains bcache runtime statistics, parsed from /sys/fs/bcache/.
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//
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// The names and meanings of each statistic were taken from bcache.txt and
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// files in drivers/md/bcache in the Linux kernel source. Counters are uint64
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// (in-kernel counters are mostly unsigned long).
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type Stats struct {
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// The name of the bcache used to source these statistics.
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Name string
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Bcache BcacheStats
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Bdevs []BdevStats
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Caches []CacheStats
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}
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// BcacheStats contains statistics tied to a bcache ID.
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type BcacheStats struct {
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AverageKeySize uint64
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BtreeCacheSize uint64
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CacheAvailablePercent uint64
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Congested uint64
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RootUsagePercent uint64
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TreeDepth uint64
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Internal InternalStats
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FiveMin PeriodStats
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Total PeriodStats
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}
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// BdevStats contains statistics for one backing device.
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type BdevStats struct {
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Name string
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DirtyData uint64
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FiveMin PeriodStats
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Total PeriodStats
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}
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// CacheStats contains statistics for one cache device.
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type CacheStats struct {
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Name string
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IOErrors uint64
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MetadataWritten uint64
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Written uint64
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Priority PriorityStats
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}
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// PriorityStats contains statistics from the priority_stats file.
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type PriorityStats struct {
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UnusedPercent uint64
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MetadataPercent uint64
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}
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// InternalStats contains internal bcache statistics.
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type InternalStats struct {
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ActiveJournalEntries uint64
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BtreeNodes uint64
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BtreeReadAverageDurationNanoSeconds uint64
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CacheReadRaces uint64
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}
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// PeriodStats contains statistics for a time period (5 min or total).
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type PeriodStats struct {
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Bypassed uint64
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CacheBypassHits uint64
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CacheBypassMisses uint64
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CacheHits uint64
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CacheMissCollisions uint64
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CacheMisses uint64
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CacheReadaheads uint64
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}
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