title: invoke aws lambda from another lambda asynchronously
body: <p>I need to invoke aws lambda from another lambda asynchronously. i have a working code for synchronous calls.</p>
  
  <pre><code>exports.handler = (event, context, callback) =&gt; {
      var aws = require('aws-sdk');
      var lambda = new aws.Lambda({
          region: 'myregion' //change to your region
      });
      console.log("lambda invoke started");
      lambda.invoke({
          FunctionName: 'testLambda',
          Payload: JSON.stringify(event, null, 2) // pass params
      }, function (error, data) {
          if (error) {
              console.log("error");
              callback(null, 'hello world');
          }
          else {
              console.log("lambda invoke end");
              callback(null, 'hello world');
          }
      });
  }
  </code></pre>
  
  <p>But in my case, 'testLambda' is a time taken function. Because i need to exit just after invoking the 'testLambda' function. Then code is updated like this</p>
  
  <pre><code>exports.handler = (event, context, callback) =&gt; {
      var aws = require('aws-sdk');
      var lambda = new aws.Lambda({
          region: 'myregion' //change to your region
      });
      console.log("lambda invoke started");
      lambda.invoke({
          FunctionName: 'testLambda',
          Payload: JSON.stringify(event, null, 2) // pass params
      });
      console.log("lambda invoke end");
      callback(null, 'hello world');
  }
  </code></pre>
  
  <p>it returns message correctly . But my 'testLambda' function is not invoked(no cloud watch logs are generated for test lambda). what is the issue related with this code.  </p>