func init() {
http.HandleFunc("/", handler)
}
在处理函数中,代码遍历数据列表,处理数据并聚合结果。前往AppEngine重复部分执行http.handler
比方说,对于给定的查询,有100个项目需要处理。对于我写日志到Appengine控制台的每个项目,“项目n已处理”。
这里是问题:
该请求不会返回。前40个左右项目的日志消息,然后重复并重复。它总是停止是相同的项目,并重新启动。
我最好的猜测是该应用程序正在达到内存限制或某事,而Appengine Go运行时只是重新启动并重新执行该处理程序。
对于一个小项目列表,处理过程如预期的那样,并且日志不显示任何循环。
有在请求日志中没有错误,但另一个日志显示:
panic: poll_ctl
goroutine 3 [running]:
runtime/eventloop.(*pollServer).ctlfd(0x9035f8, 0x204100000005, 0x3, 0x2041, 0x0, ...)
go/src/pkg/runtime/eventloop/poll_linux_amd64.go:428 +0xdf
runtime/eventloop.(*pollServer).loop(0x9035f8, 0x0)
go/src/pkg/runtime/eventloop/poll_linux_amd64.go:411 +0x4d8
created by runtime/eventloop.init·1
go/src/pkg/runtime/eventloop/poll_linux_amd64.go:232 +0x40
goroutine 1 [select (no cases)]:
appengine_internal/fd_transport.serveHTTP(0x7fff76502f58, 0x70615f2f00000002, 0x7fff76502f5b, 0x3, 0x7fff76502f6c, ...)
go/src/pkg/appengine_internal/fd_transport/fd_transport.go:44 +0x26b
appengine_internal.Main()
go/src/pkg/appengine_internal/internal.go:184 +0x1a8
main.main()
_go_main.go:16 +0x18
goroutine 2 [select]:
created by _
_.go:568 +0xd2
goroutine 10 [chan receive]:
runtime/eventloop.(*pollServer).wait(0x9035f8, 0xf840095a60, 0xf84011ac30, 0xb, 0x1, ...)
go/src/pkg/runtime/eventloop/poll_linux_amd64.go:472 +0x1a7
runtime/eventloop.(*FD).ReadFrom(0xf840095a50, 0xf840138000, 0x7d0000007d0, 0xf800000000, 0x0, ...)
go/src/pkg/runtime/eventloop/fd.go:135 +0x1c2
created by _
_.go:144 +0x7a
goroutine 5 [chan receive]:
created by _
_.go:461 +0x3ca
goroutine 6 [semacquire]:
sync.runtime_Semacquire(0xf8408034d8, 0xf8408034d8)
go/src/pkg/runtime/zsema_amd64.c:146 +0x25
sync.(*Cond).Wait(0xf840096bb0, 0x1)
go/src/pkg/sync/cond.go:67 +0xaa
created by _
_.go:462 +0x3e1
goroutine 7 [chan receive]:
runtime/eventloop.(*pollServer).wait(0x9035f8, 0xf840095c70, 0xf84011ac30, 0xb, 0x1, ...)
go/src/pkg/runtime/eventloop/poll_linux_amd64.go:472 +0x1a7
runtime/eventloop.(*FD).Read(0xf840095c60, 0xf84113a000, 0x972a80000000c, 0x2b5800000000, 0xf84011ac30, ...)
go/src/pkg/runtime/eventloop/fd.go:93 +0x18c
io.ReadAtLeast(0xf84012c0c0, 0xf840095c60, 0xf84113a000, 0x972a80000000c, 0x2b580000000c, ...)
go/src/pkg/io/io.go:254 +0xc3
io.ReadFull(0xf84012c0c0, 0xf840095c60, 0xf84113a000, 0x972a80000000c, 0xf840095c60, ...)
go/src/pkg/io/io.go:273 +0x69
created by _
_.go:845 +0x2c6
goroutine 11 [runnable]:
runtime/eventloop.(*pollServer).wait(0x9035f8, 0xf840095b10, 0xf84011ac30, 0xb, 0x1, ...)
go/src/pkg/runtime/eventloop/poll_linux_amd64.go:472 +0x1a7
runtime/eventloop.(*FD).Accept(0xf840095b00, 0x0, 0x0, 0xf84011ac30, 0xb, ...)
go/src/pkg/runtime/eventloop/fd.go:72 +0x185
net/http.(*Server).Serve(0xf840129f00, 0xf8400cfa80, 0xf840095b00, 0x0, 0x0, ...)
go/src/pkg/net/http/server.go:1012 +0x88
net/http.Serve(0xf8400cfa80, 0xf840095b00, 0xf84012c090, 0xf8400e0b10, 0xf8400e0b10, ...)
go/src/pkg/net/http/server.go:977 +0x71
created by _
_.go:145 +0xe9
goroutine 12 [timer goroutine (idle)]:
created by addtimer
go/src/pkg/runtime/ztime_amd64.c:70
goroutine 13 [runnable]:
runtime/eventloop.(*pollServer).wait(0x9035f8, 0xf8400959b0, 0xf84011ac30, 0xb, 0x1, ...)
go/src/pkg/runtime/eventloop/poll_linux_amd64.go:472 +0x1a7
runtime/eventloop.(*FD).Read(0xf8400959a0, 0xf840139000, 0x100000001000, 0x0, 0xf84011ac30, ...)
go/src/pkg/runtime/eventloop/fd.go:93 +0x18c
io.(*LimitedReader).Read(0xf84, 0xf840139000, 0x100000001000, 0xf8900000000, 0x0, ...)
go/src/pkg/io/io.go:394 +0xc1
bufio.(*Reader).fill(0xf840129f80, 0x2b5853e92000)
go/src/pkg/bufio/bufio.go:77 +0xf0
bufio.(*Reader).Read(0xf840129f80, 0xf84013d000, 0x27100000000c, 0xc, 0x0, ...)
go/src/pkg/bufio/bufio.go:142 +0x188
io.ReadAtLeast(0xf84012c600, 0xf84012c570, 0xf84013d000, 0x27100000000c, 0xc, ...)
go/src/pkg/io/io.go:254 +0xc3
io.ReadFull(0xf84012c600, 0xf84012c570, 0xf84013d000, 0x27100000000c, 0xf84012c570, ...)
go/src/pkg/io/io.go:273 +0x69
net/http.(*conn).serve(0xf8401320c0, 0x0)
go/src/pkg/net/http/server.go:656 +0x621
created by net/http.(*Server).Serve
go/src/pkg/net/http/server.go:1040 +0x430
goroutine 59 [sleep]:
time.Sleep(0x5dfdee1, 0xf8408034d0)
go/src/pkg/runtime/ztime_amd64.c:22 +0x49
created by _
_.go:791 +0xc4
goroutine 15 [chan receive]:
也许我不会记录所有的错误,但即使有什么可能导致循环?
更新 近无端循环很快耗尽我的数据存储写入配额,现在我得到一个无报价错误,这是正在记录。错误日志之后,再次调用处理程序。并再次....
func handleError(w http.ResponseWriter, c appengine.Context, err error) {
c.Infof("ERROR")
c.Errorf("ERROR datastore: %s", err.Error())
}
...
rk, err := datastore.Put(c, rk, e)
if err != nil {
handleError(w, c, err)
return
}
UPDATE 2 切换到代码运行如预期的F4实例之后。我仍然认为Appengine Go的运行时间由于某种原因(内存)而失败,并重新启动处理程序执行。这是我最好的猜测,我不知道。
可能出现您的处理程序中的Go代码效率不高的情况。如果您发布了这些代码,那么在这里有一群认真的Go专家,他们可能会使其更快,更有效地利用内存。 – 2012-04-16 15:03:22
您可以从管理控制台粘贴完整的请求日志吗? – proppy 2012-04-23 15:48:32