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fs: Add safe locking semantics for format.json (#4523)

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This patch also reverts previous changes which were
merged for migration to the newer disk format. We will
be bringing these changes in subsequent releases. But
we wish to add protection in this release such that
future release migrations are protected.

Revert "fs: Migration should handle bucketConfigs as regular objects. (#4482)"
This reverts commit 976870a391.

Revert "fs: Migrate object metadata to objects directory. (#4195)"
This reverts commit 76f4f20609.
This commit is contained in:
Harshavardhana
2017-06-12 17:40:28 -07:00
committed by GitHub
parent b8463a738c
commit 075b8903d7
20 changed files with 509 additions and 933 deletions
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4
docs/shared-backend/DESIGN.md
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@@ -81,7 +81,7 @@ An example here shows how the contention is handled with GetObject().
GetObject() holds a read lock on `fs.json`.
```go
fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket, objectMetaPrefix, object, fsMetaJSONFile)
fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket, object, fsMetaJSONFile)
rlk, err := fs.rwPool.Open(fsMetaPath)
if err != nil {
return toObjectErr(traceError(err), bucket, object)
@@ -98,7 +98,7 @@ GetObject() holds a read lock on `fs.json`.
A concurrent PutObject is requested on the same object, PutObject() attempts a write lock on `fs.json`.
```go
fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket, objectMetaPrefix, object, fsMetaJSONFile)
fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket, object, fsMetaJSONFile)
wlk, err := fs.rwPool.Create(fsMetaPath)
if err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)