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linear.js
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linear.js
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/* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
/*
* Linear scaling method
*
* Suggests adding or removing nodes or processing units,
* calculated with a cross multiplication.
* For processing units, it rounds to nearest 100 if suggestion is
* under 1000, or to nearest 1000 otherwise.
*/
const baseModule = require('./base');
const {log, maybeRound} = require('../utils.js');
function isScaleIn(suggestedSize, currentSize) {
return suggestedSize < currentSize;
}
function calculateSize(spanner) {
return baseModule.loopThroughSpannerMetrics(spanner, (spanner, metric) => {
if (baseModule.metricValueWithinRange(metric)) return spanner.currentSize;
else {
var suggestedSize = Math.ceil(spanner.currentSize * metric.value / metric.threshold)
if (isScaleIn(suggestedSize, spanner.currentSize) && spanner.scaleInLimit) {
const limit = spanner.currentSize * (spanner.scaleInLimit/100)
log(`\tscaleInLimit = ${spanner.scaleInLimit}%, so the maximum scale-in allowed for current size of ${spanner.currentSize} is ${limit} ${spanner.units}.`,
{severity: 'DEBUG', projectId: spanner.projectId, instanceId: spanner.instanceId});
const originalSuggestedSize = suggestedSize
suggestedSize = Math.max(suggestedSize, Math.ceil(spanner.currentSize - limit))
if (suggestedSize != originalSuggestedSize) {
log(`\tscaleInLimit exceeded. Original suggested size was ${originalSuggestedSize} ${spanner.units}, new suggested size is ${suggestedSize} ${spanner.units}.`,
{severity: 'DEBUG', projectId: spanner.projectId, instanceId: spanner.instanceId});
}
}
return maybeRound(suggestedSize, spanner.units, metric.name, spanner.projectId, spanner.instanceId);
}
});
}
module.exports = {
calculateSize
};