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Context timeout might race on each other when timeouts are lower i.e when two lock attempts happened very quickly on the same resource and the servers were yet trying to establish quorum. This situation can lead to locks held which wouldn't be unlocked and subsequent lock attempts would fail. This would require a complete server restart. A potential of this issue happening is when server is booting up and we are trying to hold a 'transaction.lock' in quick bursts of timeout.
66 lines
2.1 KiB
Go
66 lines
2.1 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
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*
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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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*/
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package cmd
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import (
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"context"
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"net/http"
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)
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// ClusterCheckHandler returns if the server is ready for requests.
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func ClusterCheckHandler(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "ClusterCheckHandler")
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objLayer := newObjectLayerFn()
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// Service not initialized yet
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if objLayer == nil {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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return
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}
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ctx, cancel := context.WithTimeout(ctx, globalAPIConfig.getReadyDeadline())
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defer cancel()
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opts := HealthOptions{Maintenance: r.URL.Query().Get("maintenance") == "true"}
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result := objLayer.Health(ctx, opts)
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if !result.Healthy {
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// As a maintenance call we are purposefully asked to be taken
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// down, this is for orchestrators to know if we can safely
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// take this server down, return appropriate error.
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if opts.Maintenance {
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writeResponse(w, http.StatusPreconditionFailed, nil, mimeNone)
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} else {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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}
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return
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}
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writeResponse(w, http.StatusOK, nil, mimeNone)
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}
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// ReadinessCheckHandler Checks if the process is up. Always returns success.
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func ReadinessCheckHandler(w http.ResponseWriter, r *http.Request) {
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// TODO: only implement this function to notify that this pod is
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// busy, at a local scope in future, for now '200 OK'.
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writeResponse(w, http.StatusOK, nil, mimeNone)
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}
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// LivenessCheckHandler - Checks if the process is up. Always returns success.
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func LivenessCheckHandler(w http.ResponseWriter, r *http.Request) {
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writeResponse(w, http.StatusOK, nil, mimeNone)
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}
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