minio/cmd/lockinfo-handlers.go
Harshavardhana 1c699d8d3f fs: Re-implement object layer to remember the fd (#3509)
This patch re-writes FS backend to support shared backend sharing locks for safe concurrent access across multiple servers.
2017-01-16 17:05:00 -08:00

117 lines
4.2 KiB
Go

/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* 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
*
* http://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.
*/
package cmd
import (
"strings"
"time"
)
// SystemLockState - Structure to fill the lock state of entire object storage.
// That is the total locks held, total calls blocked on locks and state of all the locks for the entire system.
type SystemLockState struct {
TotalLocks int64 `json:"totalLocks"`
// Count of operations which are blocked waiting for the lock to
// be released.
TotalBlockedLocks int64 `json:"totalBlockedLocks"`
// Count of operations which has successfully acquired the lock but
// hasn't unlocked yet (operation in progress).
TotalAcquiredLocks int64 `json:"totalAcquiredLocks"`
LocksInfoPerObject []VolumeLockInfo `json:"locksInfoPerObject"`
}
// VolumeLockInfo - Structure to contain the lock state info for volume, path pair.
type VolumeLockInfo struct {
Bucket string `json:"bucket"`
Object string `json:"object"`
// All locks blocked + running for given <volume,path> pair.
LocksOnObject int64 `json:"-"`
// Count of operations which has successfully acquired the lock
// but hasn't unlocked yet( operation in progress).
LocksAcquiredOnObject int64 `json:"-"`
// Count of operations which are blocked waiting for the lock
// to be released.
TotalBlockedLocks int64 `json:"-"`
// Count of all read locks
TotalReadLocks int64 `json:"readLocks"`
// Count of all write locks
TotalWriteLocks int64 `json:"writeLocks"`
// State information containing state of the locks for all operations
// on given <volume,path> pair.
LockDetailsOnObject []OpsLockState `json:"lockOwners"`
}
// OpsLockState - structure to fill in state information of the lock.
// structure to fill in status information for each operation with given operation ID.
type OpsLockState struct {
OperationID string `json:"id"` // String containing operation ID.
LockSource string `json:"source"` // Operation type (GetObject, PutObject...)
LockType lockType `json:"type"` // Lock type (RLock, WLock)
Status statusType `json:"status"` // Status can be Running/Ready/Blocked.
Since time.Time `json:"since"` // Time when the lock was initially held.
Duration time.Duration `json:"duration"` // Duration since the lock was held.
}
// listLocksInfo - Fetches locks held on bucket, matching prefix older than relTime.
func listLocksInfo(bucket, prefix string, relTime time.Duration) []VolumeLockInfo {
globalNSMutex.lockMapMutex.Lock()
defer globalNSMutex.lockMapMutex.Unlock()
// Fetch current time once instead of fetching system time for every lock.
timeNow := time.Now().UTC()
volumeLocks := []VolumeLockInfo{}
for param, debugLock := range globalNSMutex.debugLockMap {
if param.volume != bucket {
continue
}
// N B empty prefix matches all param.path.
if !strings.HasPrefix(param.path, prefix) {
continue
}
volLockInfo := VolumeLockInfo{
Bucket: param.volume,
Object: param.path,
LocksOnObject: debugLock.counters.total,
TotalBlockedLocks: debugLock.counters.blocked,
LocksAcquiredOnObject: debugLock.counters.granted,
}
// Filter locks that are held on bucket, prefix.
for opsID, lockInfo := range debugLock.lockInfo {
elapsed := timeNow.Sub(lockInfo.since)
if elapsed < relTime {
continue
}
// Add locks that are older than relTime.
volLockInfo.LockDetailsOnObject = append(volLockInfo.LockDetailsOnObject,
OpsLockState{
OperationID: opsID,
LockSource: lockInfo.lockSource,
LockType: lockInfo.lType,
Status: lockInfo.status,
Since: lockInfo.since,
Duration: elapsed,
})
volumeLocks = append(volumeLocks, volLockInfo)
}
}
return volumeLocks
}