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Help to recover from corrupted levelqueue (#24912)

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gitea.com experienced the corrupted LevelQueue bug again.

I think the problem is clear now: if the keys in LevelDB went
out-of-sync, the LevelQueue itself doesn't have the ability to recover,
eg:

* LevelQueue.Len() reports 100
* LevelQueue.LPop() reports ErrNotFound = errors.New("no key found")

So it needs to dive into the LevelDB to remove all keys to recover the
corrupted LevelQueue.

More comments are in TestCorruptedLevelQueue.
This commit is contained in:
wxiaoguang 2023-05-29 10:52:32 +08:00 • committed by GitHub
parent 8faf9465b3
commit 84c8ab9fd1
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 162 additions and 55 deletions
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17
modules/queue/base_levelqueue_common.go
View file

@ -17,6 +17,7 @@ import (
"github.com/syndtr/goleveldb/leveldb"
)
// baseLevelQueuePushPoper is the common interface for levelqueue.Queue and levelqueue.UniqueQueue
type baseLevelQueuePushPoper interface {
RPush(data []byte) error
LPop() ([]byte, error)
@ -24,9 +25,9 @@ type baseLevelQueuePushPoper interface {
}
type baseLevelQueueCommonImpl struct {
length int
internal baseLevelQueuePushPoper
mu *sync.Mutex
length int
internalFunc func() baseLevelQueuePushPoper
mu *sync.Mutex
}
func (q *baseLevelQueueCommonImpl) PushItem(ctx context.Context, data []byte) error {
@ -36,11 +37,11 @@ func (q *baseLevelQueueCommonImpl) PushItem(ctx context.Context, data []byte) er
defer q.mu.Unlock()
}
cnt := int(q.internal.Len())
cnt := int(q.internalFunc().Len())
if cnt >= q.length {
return true, nil
}
retry, err = false, q.internal.RPush(data)
retry, err = false, q.internalFunc().RPush(data)
if err == levelqueue.ErrAlreadyInQueue {
err = ErrAlreadyInQueue
}
@ -55,7 +56,7 @@ func (q *baseLevelQueueCommonImpl) PopItem(ctx context.Context) ([]byte, error)
defer q.mu.Unlock()
}
data, err = q.internal.LPop()
data, err = q.internalFunc().LPop()
if err == levelqueue.ErrNotFound {
return true, nil, nil
}
@ -66,8 +67,8 @@ func (q *baseLevelQueueCommonImpl) PopItem(ctx context.Context) ([]byte, error)
})
}
func baseLevelQueueCommon(cfg *BaseConfig, internal baseLevelQueuePushPoper, mu *sync.Mutex) *baseLevelQueueCommonImpl {
return &baseLevelQueueCommonImpl{length: cfg.Length, internal: internal}
func baseLevelQueueCommon(cfg *BaseConfig, mu *sync.Mutex, internalFunc func() baseLevelQueuePushPoper) *baseLevelQueueCommonImpl {
return &baseLevelQueueCommonImpl{length: cfg.Length, mu: mu, internalFunc: internalFunc}
}
func prepareLevelDB(cfg *BaseConfig) (conn string, db *leveldb.DB, err error) {