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In this video, we are going to learn a lot the execution environment and lambda lifecycle.

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One least lambda invokes our function.

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It creates an execution environment in order to isolate it.

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Runtime environment.

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The execution environment provides the required resources for running our function.

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The execution environment also provides lifecycle support for the functions, runtime and any external

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extensions associated with our function.

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You can find the image in the slide, which is an example invocation to lambda function and see how

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execution environment created and managed by the ADA is.

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Basically the function communicates with lambda runtime using the runtime API.

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Extensions communicate with Lambda using the extensions API and extensions can also receive log messages

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from the function by subscribing to logs using the logs API before lambda creates execution environments,

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it is looking to lambda configurations like amount of memory, CPU usage and maximum execution time

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settings.

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According to these settings and configurations, lambda creates an execution environment.

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So Lambda.

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If you locate the lambda execution movement lifecycle, there are several phases when Lambda Invocation

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performs.

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You can find the image in the slide.

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There are three main phases which are init invoke and shutdown process in the init phase.

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Lambda performs three tasks.

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Start all extensions, bootstrap the runtime and run the function static code.

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The init phase ends when the runtime and all extensions are ready by sending a next API request.

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The interface is limited to ten second.

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If all three tasks don't complete within the three second ten second.

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Lambda retries the init phase at the time of the first function invocation and the second phase is invoke

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phase.

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In this phase, Lambda invokes the function handler after the function runs to completion.

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Lambda prepares to handle another function invocation.

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The functions timeout setting limits the duration of the entire invoke phase.

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For example, if you set the function timeout as 5 minutes, the function and all extensions need to

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complete within the five minute.

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119.

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The function is invoked.

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After that, it goes to the next API request in order to invoke another function execution.

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And the last phase is the shutdown phase.

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In this phase is triggered if lambda function doesn't receive any invocation for a period of time in

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the shutdown phase, lambda down the runtime and that's the extension to let them stop cleanly and then

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removes the entire environment.

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Lambda sends a shutdown event to each extension, which tells the extension that the environment is

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about to shutdown.

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As you can see that we have understand the lambda execution environment and how Lambda Lifecycle works.