Lambda <-> Lambda invocation taking >=3sec once in every 10/15mins

[Baratam]

Describe the issue

Have 2lambdas running inside vpc, when I invoke 2nd lambda from the 1st the time taken is ==3sec , this is happening only once in every 10/15mins with or without traffic. Looks like the connection is not continuously live. i attached the log, you can observe the line 37, 40 which took 3secs to invoke lambda, initially we are using aws version 1.11.647 but as per suggestion by aws support enginneer we updated to aws sdk version to 2.13.5 , but we still see the lambda invocation is still taking 3sec EVEN AFTER UPGRADING.
**The total duration in the second lambda is around 600ms, but the invocation time between Lambda1 & Lambda2 is 3sec **

piece of log from attached: - observe the time stamp for -->Start & -->End
-->Start DmpSegments L2 invoking : 2020-04-29 17:42:13.226
2020-04-29 17:42:13.246 - DEBUG [main] com.abnamro.nl.solution.polar.application.utils.AwsLambdaInvokeUtil.invoke(AwsLambdaInvokeUtil.java:79): -->Start invoke:dmpGetLambda: 2020-04-29 17:42:13.246
2020-04-29 17:42:15.825 - DEBUG [main] com.abnamro.nl.solution.polar.application.utils.AwsLambdaInvokeUtil.invoke(AwsLambdaInvokeUtil.java:83): -->END invoke:dmpGetLambda: 2020-04-29 17:42:15.825
-->END DmpSegments L2 invoke: 2020-04-29 17:42:15.826
Attached the full log.
Attached the Aws lamdba invoke util java code

Steps to Reproduce

Create 2lambdas inside VPC & invoke from L1 <-> L2 & observe the lambda to lambda invocation time.

Current Behavior

The invocation time is taking longer than expected (3sec) where the 2nd lambda total duration is only 600ms, the expected total invocation time should be less than 1sec.

Your Environment

• AWS Java SDK version used: software.amazon.awssdk (2.13.5)
• JDK version used: v8
• Operating System and version: Aws lambda service
  Attached the full log.
  Attached the Aws lamdba invoke util java code

lambdainvoke_awsv2sdk.log.zip
AwsLambdaInvokeUtil.java.zip

[zoewangg]

Hi @Baratam what is the memory size of your lambda function?

You can check out this #1340 (comment) to find out the best practices to reduce SDK startup latency.

We also have a maven archetype that generates a sample lambda function with SDK best-practices incorporated. Feel free to check it out.

mvn archetype:generate \
  -DarchetypeGroupId=software.amazon.awssdk \
  -DarchetypeArtifactId=archetype-lambda \
  -DarchetypeVersion=2.13.6

[github-actions]

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