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Correct replacing of log file 

Do not leak resources in case of errors and ensure data is synced to
disk before replacing files.
pull/820/head
Baruch Even 2013-12-02 23:26:53 +02:00 committed by Xiang Li
parent 8b5f68b899
commit b66cb1a0de
1 changed files with 12 additions and 9 deletions
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21
log.go
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@ -573,7 +573,8 @@ func (l *Log) compact(index uint64, term uint64) error {
}
// create a new log file and add all the entries
file, err := os.OpenFile(l.path+".new", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
new_file_path := l.path + ".new"
file, err := os.OpenFile(new_file_path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return err
}
@ -582,25 +583,27 @@ func (l *Log) compact(index uint64, term uint64) error {
entry.Position = position
if _, err = entry.encode(file); err != nil {
file.Close()
os.Remove(new_file_path)
return err
}
}
// close the current log file
l.file.Close()
file.Sync()
// remove the current log file to .bak
err = os.Remove(l.path)
if err != nil {
return err
}
old_file := l.file
// rename the new log file
err = os.Rename(l.path+".new", l.path)
err = os.Rename(new_file_path, l.path)
if err != nil {
file.Close()
os.Remove(new_file_path)
return err
}
l.file = file
// close the old log file
old_file.Close()
// compaction the in memory log
l.entries = entries
l.startIndex = index