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lock: Moving locking to handler layer. (#3381)

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This is implemented so that the issues like in the
following flow don't affect the behavior of operation.

```
GetObjectInfo()
.... --> Time window for mutation (no lock held)
.... --> Time window for mutation (no lock held)
GetObject()
```

This happens when two simultaneous uploads are made
to the same object the object has returned wrong
info to the client.

Another classic example is "CopyObject" API itself
which reads from a source object and copies to
destination object.

Fixes #3370
Fixes #2912
This commit is contained in:
Harshavardhana
2016-12-10 16:15:12 -08:00
committed by GitHub
parent cd0f350c02
commit 4daa0d2cee
18 changed files with 337 additions and 297 deletions
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12
cmd/lockinfo-handlers.go
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@@ -61,16 +61,16 @@ type OpsLockState struct {
// Read entire state of the locks in the system and return.
func getSystemLockState() (SystemLockState, error) {
nsMutex.lockMapMutex.Lock()
defer nsMutex.lockMapMutex.Unlock()
globalNSMutex.lockMapMutex.Lock()
defer globalNSMutex.lockMapMutex.Unlock()
lockState := SystemLockState{}
lockState.TotalBlockedLocks = nsMutex.blockedCounter
lockState.TotalLocks = nsMutex.globalLockCounter
lockState.TotalAcquiredLocks = nsMutex.runningLockCounter
lockState.TotalBlockedLocks = globalNSMutex.blockedCounter
lockState.TotalLocks = globalNSMutex.globalLockCounter
lockState.TotalAcquiredLocks = globalNSMutex.runningLockCounter
for param, debugLock := range nsMutex.debugLockMap {
for param, debugLock := range globalNSMutex.debugLockMap {
volLockInfo := VolumeLockInfo{}
volLockInfo.Bucket = param.volume
volLockInfo.Object = param.path