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update variable declaration location

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This commit is contained in:
Wilson Wang 2021-05-03 10:19:33 -07:00
parent 8d8d0377a2
commit 56154216b7
1 changed files with 5 additions and 3 deletions
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8
server/mvcc/kvstore_txn.go
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@ -35,11 +35,13 @@ type storeTxnRead struct {
}
func (s *store) Read(mode ReadTxMode, trace *traceutil.Trace) TxnRead {
var tx backend.ReadTx
s.mu.RLock()
s.revMu.RLock()
// backend holds b.readTx.RLock() only when creating the concurrentReadTx. After
// ConcurrentReadTx is created, it will not block write transaction.
// For read-only workloads, we use shared buffer by copying transaction read buffer
// for higher concurrency with ongoing blocking writes.
// For write/write-read transactions, we use the shared buffer
// rather than duplicating transaction read buffer to avoid transaction overhead.
var tx backend.ReadTx
if mode == ConcurrentReadTxMode {
tx = s.b.ConcurrentReadTx()
} else {