Question

I found the log4go package loses logs from time to time.

Following is a simple code snippet(I moved the log4go directory so the following import is ok.):

package main
import (
    "log4go"
    "log"
    "fmt"
)

func main() {
    fmt.Println("fmt")
    log.Println("log")
    log4go.Info("log4go")
    log4go.Info("log4go")
}

Then I executed it by go run test.go, and the output is as follows:

fmt
2013/01/10 15:24:04 log

The messages by log4go are not written to output.

Why?

Answer 1

After checking the issues on log4go website, it seems that the log4go has a flushing problem.

Becuase it uses a channel to write to files, if the main exits too fast, the log content will not be written.

So adding a time.Sleep(time.Second) to the end of the code snippeet will cause the log content flush.