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157721f694
- We should declare a cluster ready even if read quorum is achieved (atleast n/2 disks are online). - Such that, all the zones should have enough read quorum. Thus making the cluster ready for reads.
100 lines
3.3 KiB
Go
100 lines
3.3 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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"net/http"
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"os"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/logger"
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)
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// ReadinessCheckHandler -- Checks if the quorum number of disks are available.
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// For FS - Checks if the backend disk is available
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// For Zones - Checks if all the zones have enough read quorum
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func ReadinessCheckHandler(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "ReadinessCheckHandler")
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objLayer := newObjectLayerFn()
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// Service not initialized yet
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if objLayer == nil || !objLayer.IsReady(ctx) {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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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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// LivenessCheckHandler -- checks if server can reach its disks internally.
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// If not, server is considered to have failed and needs to be restarted.
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// Liveness probes are used to detect situations where application (minio)
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// has gone into a state where it can not recover except by being restarted.
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func LivenessCheckHandler(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "LivenessCheckHandler")
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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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// Respond with 200 OK while server initializes to ensure a distributed cluster
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// is able to start on orchestration platforms like Docker Swarm.
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// Refer https://github.com/minio/minio/issues/8140 for more details.
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// Make sure to add server not initialized status in header
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w.Header().Set(xhttp.MinIOServerStatus, "server-not-initialized")
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writeSuccessResponseHeadersOnly(w)
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return
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}
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if !globalIsXL && !globalIsDistXL {
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s := objLayer.StorageInfo(ctx)
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if s.Backend.Type == BackendGateway {
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if !s.Backend.GatewayOnline {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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return
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}
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writeResponse(w, http.StatusOK, nil, mimeNone)
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return
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}
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}
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// For FS and Erasure backend, check if local disks are up.
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var erroredDisks int
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for _, ep := range globalEndpoints {
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for _, endpoint := range ep.Endpoints {
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// Check only if local disks are accessible, we do not have
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// to reach to rest of the other servers in a distributed setup.
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if !endpoint.IsLocal {
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continue
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}
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// Attempt a stat to backend, any error resulting
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// from this Stat() operation is considered as backend
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// is not available, count them as errors.
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if _, err := os.Stat(endpoint.Path); err != nil && os.IsNotExist(err) {
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logger.LogIf(ctx, err)
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erroredDisks++
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}
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}
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}
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// Any errored disks, we let orchestrators take us down.
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if erroredDisks > 0 {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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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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