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mvcc/backend: remove t.tx.DB()==nil checks with GracefulStop

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Revert https://github.com/coreos/etcd/pull/6662.

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>
This commit is contained in:
Gyu-Ho Lee 2017-04-14 18:21:35 -07:00
parent cd470f9ccd
commit 8ffd58fb3b
1 changed files with 5 additions and 13 deletions
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18
mvcc/backend/batch_tx.go
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@ -166,19 +166,11 @@ func (t *batchTx) commit(stop bool) {
t.backend.mu.RLock()
defer t.backend.mu.RUnlock()
// batchTx.commit(true) calls *bolt.Tx.Commit, which
// initializes *bolt.Tx.db and *bolt.Tx.meta as nil,
// and subsequent *bolt.Tx.Size() call panics.
//
// This nil pointer reference panic happens when:
// 1. batchTx.commit(false) from newBatchTx
// 2. batchTx.commit(true) from stopping backend
// 3. batchTx.commit(false) from inflight mvcc Hash call
//
// Check if db is nil to prevent this panic
if t.tx.DB() != nil {
atomic.StoreInt64(&t.backend.size, t.tx.Size())
}
// t.tx.DB()==nil if 'CommitAndStop' calls 'batchTx.commit(true)',
// which initializes *bolt.Tx.db and *bolt.Tx.meta as nil; panics t.tx.Size().
// Server must make sure 'batchTx.commit(false)' does not follow
// 'batchTx.commit(true)' (e.g. stopping backend, and inflight Hash call).
atomic.StoreInt64(&t.backend.size, t.tx.Size())
return
}