流上傳時JavaScript堆內存不足錯誤

Question

我具有流上傳功能：

function doChunkInput() {
  console.log('Put Objects Chunk');
  let stream = new Readable({
    read() {}
  })

  for(i=0; i < 10000000000; i++) {
    stream.push(' data');
    stream.push(' more data');
    stream.push(' and more data');
  }

  // Pay attention to this
  // null indicates the end of the stream, so the `data` event will be fired
  stream.push(null)

  const params = {
    Bucket: bucket,
    Body: stream,
    Key: `sitemap.1.xml`,
  };
  return cos.upload(params).promise();
}

當我運行它時，出現此錯誤：

<--- Last few GCs --->

[39640:0x10263e000]    27425 ms: Mark-sweep 1394.1 (1426.8) -> 1394.1 (1421.8) MB, 3253.8 / 0.0 ms  (+ 12.3 ms in 367 steps since start of marking, biggest step 11.6 ms, walltime since start of marking 3644 ms) (average mu = 0.156, current mu = 0.119) all[39640:0x10263e000]    27442 ms: Scavenge 1395.3 (1421.8) -> 1395.4 (1423.8) MB, 8.6 / 0.0 ms  (average mu = 0.156, current mu = 0.119) allocation failure 


<--- JS stacktrace --->

==== JS stack trace =========================================

    0: ExitFrame [pc: 0x274ce15be3d]
Security context: 0x320c0d71e6e1 <JSObject>
    1: write [0x320cf221e191] [buffer.js:~896] [pc=0x274ce61b0ca](this=0x320c48cc5689 <Uint8Array map = 0x320cf21519e1>,string=0x320cd6757f31 <String[10]:  more data>,offset=0x320c0d73d7b9 <String[4]: utf8>,length=0x320cb18826f1 <undefined>,encoding=0x320cb18826f1 <undefined>)
    2: arguments adaptor frame: 2->4
    3: from [0x320cf221dbc1] [buffer.js:~199] ...

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: 0x10003b125 node::Abort() [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
 2: 0x10003b32f node::OnFatalError(char const*, char const*) [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
 3: 0x1001a89a5 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
 4: 0x100573dc2 v8::internal::Heap::FatalProcessOutOfMemory(char const*) [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
 5: 0x100576895 v8::internal::Heap::CheckIneffectiveMarkCompact(unsigned long, double) [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
 6: 0x10057273f v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
 7: 0x100570914 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
 8: 0x10056f518 v8::internal::Heap::HandleGCRequest() [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
 9: 0x100524d48 v8::internal::StackGuard::HandleInterrupts() [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
10: 0x1007d45b1 v8::internal::Runtime_StackGuard(int, v8::internal::Object**, v8::internal::Isolate*) [/Users/me/.nvm/versions/node/v10.14.2/bin/node]
11: 0x274ce15be3d 
12: 0x274ce61b0ca 
13: 0x274ce10a5c3 
Abort trap: 6

我該如何解決？

Answer 1

您應該聽聽背壓。 當.push返回false時 ，表示您嘗試添加的數據量超出了使用者的消耗量。 在這種情況下，您應該停止並等待對_read的進一步調用：

 let i = 0;
 let stream = new Readable({
    read() {
      while(i < 1000000000) {
         if(!this.push("data")) return;
         i++
      }
      this.push(null);
    }
 })