close file handle after method is end in the global_state.go.

[mei-rune]

diff --git a/wal/global_state.go b/wal/global_state.go
index 92e3666..9b161ee 100644
--- a/wal/global_state.go
+++ b/wal/global_state.go
@@ -44,8 +44,10 @@ func newGlobalState(path string) (*GlobalState, error) {
        return nil, err
    }
    if err := state.read(f); err != nil {
+       f.Close()
        return nil, err
    }
+   f.Close()
    state.path = path
    return state, nil
 }
@@ -57,14 +59,17 @@ func (self *GlobalState) writeToFile() error {
    }

    if _, err := newFile.Seek(0, os.SEEK_SET); err != nil {
+       newFile.Close()
        return err
    }

    if err := self.write(newFile); err != nil {
+       newFile.Close()
        return err
    }

    if err := newFile.Sync(); err != nil {
+       newFile.Close()
        return err
    }

@@ -72,7 +77,9 @@ func (self *GlobalState) writeToFile() error {
        return err
    }

-   os.Remove(self.path)
+   if err := os.Remove(self.path); nil != err && !os.IsNotExist(err) {
+       return err
+   }
    return os.Rename(self.path+".new", self.path)
 }

[mei-rune]

It isn't fix it.

@@ -32,6 +32,10 @@ type GlobalState struct {
func newGlobalState(path string) (*GlobalState, error) {
f, err := os.Open(path)
+ if err != nil {
+ defer f.Close()
+ }
+
state := &GlobalState{
ServerLastRequestNumber: map[uint32]uint32{},
ShardLastSequenceNumber: map[uint32]uint64{},

" if err != nil {" is error code, " if err == nil {" is ok.

pull request is "ensure close file before rename bookmark file. #840"