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a55602df4a
It is the case with the benchmark tool that we thought that we generated multiple series and saved them to the disk as such, when in reality, we overwrote the fields of the outgoing metrics via Go map reference behavior. This was accidental. In the course of diagnosing this, a few errors were found: 1. ``newSeriesFrontier`` should check to see if the candidate fingerprint is within the given domain of the ``diskFrontier``. If not, as the contract in the docstring stipulates, a ``nil`` ``seriesFrontier`` should be emitted. 2. In the interests of aiding debugging, the raw LevelDB ``levigoIterator`` type now includes a helpful forensics ``String()`` method. This work produced additional cleanups: 1. ``Close() error`` with the storage stack is technically incorrect, since nowhere in the bowels of it does an error actually occur. The interface has been simplified to remove this for now.
90 lines
3.2 KiB
Go
90 lines
3.2 KiB
Go
// Copyright 2013 Prometheus Team
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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 metric
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import (
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"github.com/prometheus/prometheus/model"
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"github.com/prometheus/prometheus/storage"
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"time"
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)
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// MetricPersistence is a system for storing metric samples in a persistence
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// layer.
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type MetricPersistence interface {
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// A storage system may rely on external resources and thusly should be
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// closed when finished.
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Close()
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// Commit all pending operations, if any, since some of the storage components
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// queue work on channels and operate on it in bulk.
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// Flush() error
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// Record a new sample in the storage layer.
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AppendSample(model.Sample) error
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// Record a new sample in the storage layer.
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AppendSamples(model.Samples) error
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// Get all of the metric fingerprints that are associated with the provided
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// label set.
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GetFingerprintsForLabelSet(model.LabelSet) (model.Fingerprints, error)
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// Get all of the metric fingerprints that are associated for a given label
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// name.
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GetFingerprintsForLabelName(model.LabelName) (model.Fingerprints, error)
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// Get the metric associated with the provided fingerprint.
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GetMetricForFingerprint(model.Fingerprint) (*model.Metric, error)
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GetValueAtTime(model.Fingerprint, time.Time, StalenessPolicy) (*model.Sample, error)
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GetBoundaryValues(model.Fingerprint, model.Interval, StalenessPolicy) (*model.Sample, *model.Sample, error)
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GetRangeValues(model.Fingerprint, model.Interval) (*model.SampleSet, error)
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ForEachSample(IteratorsForFingerprintBuilder) (err error)
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// Get all label values that are associated with a given label name.
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GetAllValuesForLabel(model.LabelName) (model.LabelValues, error)
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// Requests the storage stack to build a materialized View of the values
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// contained therein.
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// MakeView(builder ViewRequestBuilder, deadline time.Duration) (View, error)
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}
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// Describes the lenience limits for querying the materialized View.
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type StalenessPolicy struct {
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// Describes the inclusive limit at which individual points if requested will
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// be matched and subject to interpolation.
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DeltaAllowance time.Duration
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}
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// View provides view of the values in the datastore subject to the request of a
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// preloading operation.
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type View interface {
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GetValueAtTime(model.Fingerprint, time.Time) []model.SamplePair
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GetBoundaryValues(model.Fingerprint, model.Interval) (first []model.SamplePair, second []model.SamplePair)
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GetRangeValues(model.Fingerprint, model.Interval) []model.SamplePair
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// Destroy this view.
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Close()
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}
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type Series interface {
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Fingerprint() model.Fingerprint
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Metric() model.Metric
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}
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type IteratorsForFingerprintBuilder interface {
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ForStream(stream stream) (storage.RecordDecoder, storage.RecordFilter, storage.RecordOperator)
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}
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